See also
- List of comets by type
- List of Halley-type comets
- List of hyperbolic comets
- List of long-period comets
- List of numbered comets
- List of periodic comets
The following is a list of comets with a very high eccentricity (generally 0.99 or higher) and a period of over 1,000 years that do not quite have a high enough velocity to escape the Solar System. Often, these comets, due to their extreme semimajor axes and eccentricity, will have small orbital interactions with planets and minor planets, most often ending up with the comets fluctuating significantly in their orbital path. These comets probably come from the Oort cloud, a cloud of comets orbiting the Sun from ~10,000 to roughly 50,000 AU. The actual orbit of these comets significantly differs from the provided coordinates. A Solar System barycentric orbit computed at an epoch when the object is located beyond all the planets is a more accurate measurement of its long-term orbit.
| Comet designation | Name/ discoverer(s) | Period (years) | e | a (AU) | q (AU) | i (°) | Abs. mag (M1) | Perihelion date | Ref |
|---|---|---|---|---|---|---|---|---|---|
| C/1680 V1 | Great Comet of 1680 | 9370 | 0.999986 | 444.4285 | 0.006222 | 60.6784 | 1680/12/18 | MPC · JPL | |
| C/1769 P1 | Messier | 2090 | 0.999249 | 163.4554 | 0.122755 | 40.7338 | 1769/10/08 | MPC · JPL | |
| C/1785 E1 | Méchain | 1325 | 0.99646 | 120.6893 | 0.42724 | 92.639 | 1785/04/08 | MPC · JPL | |
| C/1807 R1 | Great comet of 1807 | 1710 | 0.995488 | 143.2012 | 0.646124 | 63.1762 | 1807/09/19 | MPC · JPL | |
| C/1811 F1 | Great Comet of 1811 | 3100 | 0.995125 | 212.3922 | 1.035412 | 106.9342 | 1811/09/12 | MPC · JPL | |
| C/1822 N1 | Pons | 5480 | 0.996316 | 310.8303 | 1.145099 | 127.3429 | 1822/10/24 | MPC · JPL | |
| C/1823 Y1 | Great Comet of 1823 | 2300 | 0.9987 | 170 | 0.2252 | 103.68 | 1823/12/09 | MPC · JPL | |
| C/1825 K1 | Gambart | 3870 | 0.996395 | 246.605 | 0.889011 | 123.3414 | 1825/05/31 | MPC · JPL | |
| C/1825 N1 | Pons | 4480 | 0.995431 | 271.5793 | 1.240846 | 146.4353 | 1825/12/11 | MPC · JPL | |
| C/1826 P1 | Pons | 6270 | 0.997492 | 340.063 | 0.852878 | 25.9496 | 1826/10/09 | MPC · JPL | |
| C/1840 B1 | Galle | 2430 | 0.99325 | 180.8076 | 1.220451 | 120.7807 | 1840/03/13 | MPC · JPL | |
| C/1844 N1 | Mauvais | 208900 | 0.999757 | 3520.1687 | 0.855401 | 131.4092 | 1844/10/17 | MPC · JPL | |
| C/1844 Y1 | Great Comet of 1844 | 6800 | 0.999302 | 358.9355 | 0.250537 | 45.5651 | 1844/12/14 | MPC · JPL | |
| C/1846 B1 | de Vico | 2720 | 0.992403 | 194.9063 | 1.480703 | 47.4257 | 1846/01/22 | MPC · JPL | |
| C/1847 C1 | Hind | 10300 | 0.99991 | 473.2556 | 0.042593 | 48.6636 | 1847/03/30 | MPC · JPL | |
| C/1847 N1 | Mauvais | 44280 | 0.998589 | 1251.6357 | 1.766058 | 96.5817 | 1847/08/09 | MPC · JPL | |
| C/1849 G1 | Schweizer | 13560 | 0.998427 | 568.5696 | 0.89436 | 66.9587 | 1849/06/08 | MPC · JPL | |
| C/1850 J1 | Petersen | 21450 | 0.998599 | 771.8979 | 1.081429 | 68.1848 | 1850/07/24 | MPC · JPL | |
| C/1854 R1 | Klinkerfues | 1290 | 0.993246 | 118.2650 | 0.798762 | 40.9201 | 1854/10/28 | MPC · JPL | |
| C/1854 Y1 | Winnecke-Dien | 1960 | 0.991309 | 156.4219 | 1.359463 | 14.152 | 1854/12/16 | MPC · JPL | |
| C/1857 Q1 | Klinkerfues | 2460 | 0.996913 | 182.3447 | 0.562898 | 123.9614 | 1857/10/01 | MPC · JPL | |
| C/1858 L1 | Donati | 1950 | 0.996295 | 156.132 | 0.578469 | 116.9512 | 1858/09/30 | MPC · JPL | |
| C/1863 G1 | Klinkerfues | 45260 | 0.999159 | 1269.962 | 1.068038 | 112.6209 | 1863/04/05 | MPC · JPL | |
| C/1863 G2 | Respighi | 17840 | 0.999079 | 682.7155 | 0.628781 | 85.4961 | 1863/04/21 | MPC · JPL | |
| C/1863 V1 | Tempel | 15820 | 0.998879 | 630.1632 | 0.706413 | 78.0817 | 1863/11/09 | MPC · JPL | |
| C/1864 N1 | Tempel | 3930 | 0.996351 | 249.1888 | 0.90929 | 178.1269 | 1864/08/16 | MPC · JPL | |
| C/1864 O1 | Donati-Toussaint | 55240 | 0.999358 | 1450.486 | 0.931212 | 109.7124 | 1864/10/11 | MPC · JPL | |
| C/1871 G1 | Winnecke | 5180 | 0.997814 | 299.3138 | 0.6543 | 87.6034 | 1871/06/11 | MPC · JPL | |
| C/1871 V1 | Tempel | 2050 | 0.995714 | 161.2851 | 0.691268 | 98.2992 | 1871/12/20 | MPC · JPL | |
| C/1873 Q1 | Borrelly | 3390 | 0.996482 | 225.7138 | 0.794061 | 95.9662 | 1873/09/11 | MPC · JPL | |
| C/1873 Q2 | Henry | 53830 | 0.99973 | 1425.6037 | 0.384913 | 121.4625 | 1873/10/02 | MPC · JPL | |
| C/1874 H1 | Coggia | 13710 | 0.99882 | 572.6966 | 0.675782 | 66.3439 | 1874/07/07 | MPC · JPL | |
| C/1874 O1 | Borrelly | 24370 | 0.998831 | 840.5894 | 0.982649 | 41.8266 | 1874/08/27 | MPC · JPL | |
| C/1877 G1 | Winnecke | 19750 | 0.9987 | 730.7538 | 0.94998 | 121.1548 | 1877/04/18 | MPC · JPL | |
| C/1877 G2 | Swift | 10700 | 0.997923 | 485.8223 | 1.009053 | 77.1916 | 1877/04/27 | MPC · JPL | |
| C/1881 K1 | Great Comet of 1881 | 2390 | 0.99589 | 178 | 0.734547 | 63.4253 | 1881/06/16 | MPC · JPL | |
| C/1881 W1 | Swift | 2740 | 0.990169 | 195.8064 | 1.924973 | 144.8016 | 1881/11/20 | MPC · JPL | |
| C/1882 F1 | Wells | 1019140 | 0.999994 | 10127.1667 | 0.060763 | 73.7977 | 1882/06/11 | MPC · JPL | |
| C/1887 J1 | Barnard | 7640 | 0.996093 | 356.7476 | 1.393813 | 17.5479 | 1887/06/17 | MPC · JPL | |
| C/1888 D1 | Sawerthal | 2200 | 0.995874 | 169.3582 | 0.698772 | 42.2482 | 1888/03/17 | MPC · JPL | |
| C/1888 P1 | Brooks | 971160 | 0.999908 | 9806.8043 | 0.902226 | 74.1904 | 1888/07/31 | MPC · JPL | |
| C/1888 U1 | Barnard | 2400 | 0.991488 | 179.494 | 1.527853 | 56.3425 | 1888/09/13 | MPC · JPL | |
| C/1889 G1 | Barnard | 1379700 | 0.999818 | 12393.3846 | 2.255596 | 163.8517 | 1889/06/11 | MPC · JPL | |
| C/1889 O1 | Davidson | 9080 | 0.997611 | 435.2118 | 1.039721 | 65.9916 | 1889/07/19 | MPC · JPL | |
| C/1890 O2 | Denning | 61030 | 0.999187 | 1550.0898 | 1.260223 | 98.9373 | 1890/09/25 | MPC · JPL | |
| C/1890 V1 | Zona | 11040 | 0.995872 | 495.8077 | 2.046694 | 154.307 | 1890/08/07 | MPC · JPL | |
| C/1892 E1 | Swift | 23020 | 0.998731 | 809.1663 | 1.026832 | 38.7002 | 1892/04/07 | MPC · JPL | |
| C/1893 N1 | Rordame-Quénisset | 44150 | 0.99946 | 1249.1648 | 0.674549 | 159.9804 | 1893/07/07 | MPC · JPL | |
| C/1893 U1 | Brooks | 3520 | 0.996489 | 231.2706 | 0.811991 | 129.8233 | 1893/09/19 | MPC · JPL | |
| C/1898 V1 | Chase | 315460 | 0.999507 | 4634.0588 | 2.2846 | 22.5046 | 1898/09/20 | MPC · JPL | |
| C/1902 R1 | Perrine | 1403170 | 0.999968 | 12533.5625 | 0.4011 | 156.3548 | 1902/11/24 | MPC · JPL | |
| C/1903 A1 | Giacobini | 43880 | 0.99967 | 1244.1242 | 0.4106 | 30.9416 | 1903/03/16 | MPC · JPL | |
| C/1906 B1 | Brooks | 84552.21 | 0.999327 | 1926.3913 | 1.296 | 126.4425 | 7.0 | 1905/12/22 | MPC · JPL |
| C/1907 L2 | Daniel | 8750 | 0.998794 | 424.6874 | 0.512173 | 8.9577 | 1907/09/04 | MPC · JPL | |
| C/1909 L1 | Borrelly-Daniel | 2040 | 0.994762 | 160.9095 | 0.842844 | 52.0803 | 1909/06/05 | MPC · JPL | |
| C/1910 A1 | Great January comet of 1910 | 4142890 | 0.999995 | 25795 | 0.128975 | 138.7812 | 1910/01/17 | MPC · JPL | |
| C/1910 P1 | Metcalf | 940030 | 0.999797 | 9596.1232 | 1.948013 | 121.0556 | 1910/09/16 | MPC · JPL | |
| C/1911 N1 | Kiess | 2500 | 0.9963 | 184 | 0.68383 | 148.42 | 1911/06/30 | MPC · JPL | |
| C/1911 O1 | Brooks | 2090 | 0.997005 | 163.1454 | 0.489429 | 16.4153589 | 1911/10/28 | MPC · JPL | |
| C/1911 S2 | Quénisset | 8910 | 0.998167 | 429.6907 | 0.787623 | 108.1 | 1911/11/12 | MPC · JPL | |
| C/1913 J1 | Schaumasse | 5436 | 0.995288 | 309.1747 | 1.456831 | 152.3673 | 1913/05/15 | MPC · JPL | |
| C/1913 R1 | Metcalf | 13100 | 0.99756 | 555.7869 | 1.35612 | 143.3547 | 1913/09/14 | MPC · JPL | |
| C/1914 S1 | Campbell? | 12350 | 0.998666 | 534.2999 | 0.712756 | 77.836 | 1914/08/05 | MPC · JPL | |
| C/1916 G1 | Wolf | 150900 | 0.999405 | 2834.363 | 1.686446 | 25.6592 | 1917/06/17 | MPC · JPL | |
| C/1920 X1 | Skjellerup | 2700 | 0.994081 | 193.9334 | 1.147892 | 22.0303 | 1920/12/11 | MPC · JPL | |
| C/1922 B1 | Reid | 1400 | 0.986968 | 125.0064 | 1.629083 | 32.4456 | 1921/10/28 | MPC · JPL | |
| C/1922 W1 | Skjellerup | 1790 | 0.993735 | 147.4206 | 0.92359 | 23.3659 | 1923/01/04 | MPC · JPL | |
| C/1924 F1 | Reid | 44320 | 0.998598 | 1252.2789 | 1.755695 | 72.3273 | 1924/03/13 | MPC · JPL | |
| C/1925 F2 | Reid | 6120 | 0.995116 | 334.418 | 1.633299 | 26.9797 | 1925/07/29 | MPC · JPL | |
| C/1926 B1 | Blathwayt | 2350 | 0.992384 | 176.6645 | 1.345477 | 128.2986 | 1926/01/02 | MPC · JPL | |
| C/1927 E1 | Stearns | 90990 | 0.998179 | 2023.0104 | 3.683902 | 87.6525 | 1927/03/22 | MPC · JPL | |
| C/1927 X1 | Skjellerup-Maristany | 36530 | 0.99984 | 1100.9813 | 0.176157 | 85.1126 | 1927/12/18 | MPC · JPL | |
| C/1929 Y1 | Wilk | 18190 | 0.999028 | 691.5998 | 0.672235 | 124.5103 | 1930/01/22 | MPC · JPL | |
| C/1930 D1 | Peltier – Schwassmann – Wachmann | 14030 | 0.998131 | 581.6554 | 1.087114 | 99.883 | 1930/11/15 | MPC · JPL | |
| C/1931 P1 | Ryves Comet | 1180 | 0.999326 | 111.1632 | 0.074924 | 169.2881 | 1931/08/25 | MPC · JPL | |
| C/1936 K1 | Peltier | 1550 | 0.991775 | 133.7226 | 1.099868 | 78.5447 | 1936/06/08 | MPC · JPL | |
| C/1937 N1 | Finsler | 13793870 | 0.999985 | 57516 | 0.862744 | 146.4156 | 1937/08/15 | MPC · JPL | |
| C/1939 B1 | Kozik-Peltier | 1770 | 0.995103 | 146.3133 | 0.716496 | 63.5238 | 1939/02/06 | MPC · JPL | |
| C/1939 H1 | Jurlof-Achmarof-Hassel | 6460 | 0.998477 | 346.8588 | 0.528266 | 138.1212 | 1939/04/10 | MPC · JPL | |
| C/1939 V1 | Friend | 6180 | 0.997192 | 336.6129 | 0.945209 | 92.952 | 1939/11/05 | MPC · JPL | |
| C/1941 B2 | de Kock-Paraskevopoulos | 26100 | 0.999102 | 879.7695 | 0.790033 | 168.2039 | 1941/01/27 | MPC · JPL | |
| C/1942 X1 | Whipple-Fedtke-Tevzadze | 2280 | 0.992196 | 173.4555 | 1.353647 | 19.7127 | 1943/02/06 | MPC · JPL | |
| C/1944 H1 | Väisälä | 7140 | 0.9935 | 370.9009 | 2.410856 | 17.2882 | 1945/01/04 | MPC · JPL | |
| C/1947 F1 | Rondanina-Bester | 3210 | 0.997427 | 217.5667 | 0.559799 | 39.3015 | 1947/05/20 | MPC · JPL | |
| C/1947 X1-A | Southern Comet of 1947 | 3800 | 0.999548 | 243.4336 | 0.110032 | 138.5419 | 1947/12/02 | MPC · JPL | |
| C/1947 X1-B | Southern Comet of 1947 | 5110 | 0.999629 | 296.558 | 0.110023 | 138.5332 | 1947/12/02 | MPC · JPL | |
| C/1948 L1 | Honda-Bernasconi | 67700 | 0.999875 | 1661.024 | 0.207628 | 23.1489 | 1948/05/15 | MPC · JPL | |
| C/1948 N1 | Wirtanen | 242110 | 0.999352 | 3884.5787 | 2.517207 | 130.2675 | 1949/05/01 | MPC · JPL | |
| C/1948 V1 | Eclipse Comet of 1948 | 95100 | 0.999935 | 2083.4 | 0.135421 | 23.117 | 1948/10/27 | MPC · JPL | |
| C/1948 W1 | Bester | 11490 | 0.997499 | 509.1675 | 1.273428 | 87.6054 | 1948/10/22 | MPC · JPL | |
| C/1949 N1 | Bappu – Bok-Newkirk | 59130 | 0.998644 | 1517.8296 | 2.058177 | 105.7686 | 1949/10/26 | MPC · JPL | |
| C/1951 P1 | Wilson – Harrington | 151100 | 0.999739 | 2836.8851 | 0.740427 | 152.5337 | 1952/01/12 | MPC · JPL | |
| C/1952 M1 | Peltier | 312500 | 0.999739 | 4605.0766 | 1.201925 | 45.5521 | 1952/06/15 | MPC · JPL | |
| C/1952 Q1 | Harrington | 8210 | 0.99591 | 407.0848 | 1.664977 | 59.1154 | 1953/01/05 | MPC · JPL | |
| C/1953 G1 | Mrkos – Honda | 7750 | 0.997391 | 391.7716 | 1.022132 | 93.8573 | 1953/05/26 | MPC · JPL | |
| C/1955 N1 | Bakharev-Macfarlane-Krienke | 3830 | 0.994167 | 244.7197 | 1.42745 | 50.0329 | 1955/07/11 | MPC · JPL | |
| C/1957 P1 | Mrkos | 13210 | 0.999365 | 558.9496 | 0.354933 | 93.9411 | 1957/08/01 | MPC · JPL | |
| C/1958 D1 | Burnham | 3534880 | 0.999943 | 23205.0702 | 1.322689 | 15.7879 | 1958/04/16 | MPC · JPL | |
| C/1958 R1 | Burnham-Slaughter | 1339380 | 0.999866 | 12150.7313 | 1.628198 | 61.2576 | 1959/03/11 | MPC · JPL | |
| C/1959 X1 | Mrkos | 350810 | 0.999748 | 4974.0634921 | 1.253464 | 19.6339 | 1959/11/13 | MPC · JPL | |
| C/1960 Y1 | Candy | 1080 | 0.9899 | 105.1101 | 1.061612 | 150.9552 | 1961/02/08 | MPC · JPL | |
| C/1961 O1 | Wilson | 34410 | 0.999962 | 1057.8684 | 0.040199 | 24.2116 | 1961/07/17 | MPC · JPL | |
| C/1961 R1 | Humason | 2920 | 0.989569 | 204.5261 | 2.133412 | 153.278 | 1962/12/10 | MPC · JPL | |
| C/1963 F1 | Alcock | 22300 | 0.99806 | 792.3201 | 1.537101 | 86.2194 | 1963/05/05 | MPC · JPL | |
| C/1964 L1 | Tomita-Gerber-Honda | 1360 | 0.995933 | 123.03 | 0.500363 | 161.8323 | 1964/06/30 | MPC · JPL | |
| C/1964 P1 | Everhart | 6860 | 0.996513 | 361.1342 | 1.259275 | 67.9689 | 1964/08/23 | MPC · JPL | |
| C/1965 S1-B | Ikeya – Seki | 1060 | 0.999925 | 103.7067 | 0.007778 | 141.861 | 1965/10/21 | MPC · JPL | |
| C/1966 P1 | Kilston | 236260 | 0.999376 | 3821.7115 | 2.384748 | 40.2648 | 1966/10/28 | MPC · JPL | |
| C/1966 P2 | Barbon | 37033 | 0.998183 | 1111.0435 | 2.018766 | 28.7058 | 1966/04/17 | MPC · JPL | |
| C/1967 Y1 | Ikeya – Seki | 89490 | 0.999152 | 2000.6851 | 1.696581 | 129.3153 | 1968/02/25 | MPC · JPL | |
| C/1968 H1 | Tago – Honda-Yamamoto | 2300 | 0.9961 | 174 | 0.680378 | 102.1698 | 9.8 | 1968/05/16 | MPC · JPL |
| C/1968 Y1 | Thomas | 18750 | 0.995301 | 705.6891 | 3.316033 | 45.2291 | 1969/01/12 | MPC · JPL | |
| C/1969 O1-A | Kohoutek | 87080 | 0.999125 | 1964.6686 | 1.719085 | 86.3128 | 1970/03/21 | MPC · JPL | |
| C/1969 T1 | Tago-Sato-Kosaka | 508060 | 0.999926 | 6400 | 0.4726395 | 75.81773 | 6.5 | 1969/12/21 | MPC · JPL |
| C/1969 Y1 | Bennett | 1680 | 0.996193 | 141.21513 | 0.537606 | 90.0394 | 1970/03/20 | MPC · JPL | |
| C/1972 E1 | Bradfield | 11010 | 0.998126 | 494.778 | 0.927214 | 123.693 | 1972/03/27 | MPC · JPL | |
| C/1972 F1 | Gehrels | 35090 | 0.996943 | 1071.8224 | 3.276561 | 175.616 | 1971/01/06 | MPC · JPL | |
| C/1972 X1 | Araya | 12551360 | 0.99991 | 54008.3111 | 4.860748 | 113.0902 | 1972/12/18 | MPC · JPL | |
| C/1973 D1 | Kohoutek | 35600 | 0.998723 | 1082.2388 | 1.382019 | 121.5982 | 1973/06/07 | MPC · JPL | |
| C/1974 C1 | Bradfield | 67680 | 0.999697 | 1660.6964 | 0.503191 | 61.2842 | 1974/03/18 | MPC · JPL | |
| C/1974 F1 | Lovas | 658170 | 0.999602 | 7566.4724 | 3.011456 | 50.6485 | 1975/08/22 | MPC · JPL | |
| C/1975 T1 | Mori-Sato-Fujikawa | 15880 | 0.997461 | 632 | 1.603934 | 97.6077 | 5.5 | 1975/12/25 | MPC · JPL |
| C/1975 V1-A | Comet West | 558300 | 0.999971 | 6780.2069 | 0.196626 | 43.0664 | 1967/02/25 | MPC · JPL | |
| C/1976 D1 | Bradfield | 1600 | 0.993811 | 136.9866 | 0.84781 | 46.834 | 1976/02/24 | MPC · JPL | |
| C/1976 J1 | Harlan | 368920 | 0.999695 | 5143.859 | 1.568877 | 38.8063 | 1976/11/03 | MPC · JPL | |
| C/1977 R1 | Kohler | 101000 | 0.999543 | 2170 | 0.9905761 | 48.71188 | 7.3 | 1977/11/10 | MPC · JPL |
| C/1977 V1 | Tsuchinshan | 972760 | 0.999633 | 9817.545 | 3.603039 | 168.5495 | 1977/06/24 | MPC · JPL | |
| C/1978 T1 | Seargent | 3300 | 0.99832 | 220 | 0.36988 | 67.828 | 1978/09/14 | MPC · JPL | |
| C/1980 V1 | Meier | 4820 | 0.99468 | 285 | 1.51956 | 100.9864 | 7.2 | 1980/12/09 | MPC · JPL |
| C/1980 Y1 | Bradfield | 29040 | 0.999725 | 944.8109 | 0.259823 | 138.585 | 1980/12/29 | MPC · JPL | |
| C/1980 Y2 | Panther | 66500 | 0.998991 | 1640 | 1.657269 | 82.64774 | 6.1 | 1981/01/27 | MPC · JPL |
| C/1981 H1 | Bus | 125816 | 0.999021 | 2510.8713 | 2.458143 | 160.664 | 1981/07/30 | MPC · JPL | |
| C/1981 M1 | Gonzalez | 239560 | 0.999395 | 3857.1917 | 2.333601 | 107.1467 | 1981/03/25 | MPC · JPL | |
| C/1982 M1 | Austin | 35100 | 0.999396 | 1072 | 0.6478114 | 84.4951 | 8.8 | 1982/08/24 | MPC · JPL |
| C/1983 J1 | Sugano-Saigusa-Fujikawa | 330473.13 | 0.999901 | 4779.898 | 0.471 | 96.623 | 12.3 | 1983/05/01 | MPC · JPL |
| C/1983 N1 | IRAS | 269180 | 0.99942 | 4168.9638 | 2.417999 | 138.8364 | 1983/05/02 | MPC · JPL | |
| C/1984 N1 | Austin | 82260 | 0.999846 | 1891.4545 | 0.291284 | 164.1533 | 1984/08/12 | MPC · JPL | |
| C/1984 U1 | Shoemaker | 38780 | 0.995209 | 1145.723 | 5.489159 | 179.2123 | 1984/09/03 | MPC · JPL | |
| C/1984 V1 | Levy-Rudenko | 39600 | 0.99921 | 1160 | 0.917949 | 65.7146 | 9.4 | 1984/12/14 | MPC · JPL |
| C/1984 W2 | Hartley | 926200 | 0.999579 | 9501.7435 | 4.000234 | 89.3273 | 1985/09/28 | MPC · JPL | |
| C/1985 R1 | Hartley-Good | 450000 | 0.999881 | 5800 | 0.694577 | 79.9294 | 8.4 | 1985/12/09 | MPC · JPL |
| C/1986 N1 | Churyumov-Solodovnikov | 426920 | 0.999534 | 5669.7575 | 2.642107 | 114.9293 | 1986/05/06 | MPC · JPL | |
| C/1986 V1 | Sorrells | 2601160 | 0.999909 | 18913.7912 | 1.721155 | 160.5801 | 1987/03/09 | MPC · JPL | |
| C/1987 B1 | Nishikawa-Takamizawa – Tago | 2980 | 0.9958 | 207 | 0.869589 | 172.22989 | 7.4 | 1987/03/17 | MPC · JPL |
| C/1987 P1 | Bradfield | 2123 | 0.99474 | 165.2 | 0.868956 | 34.08809 | 6 | 1987/11/07 | MPC · JPL |
| C/1987 U3 | McNaught | 8200 | 0.99792 | 406 | 0.84393 | 97.5751 | 6.9 | 1987/12/02 | MPC · JPL |
| C/1988 A1 | Liller | 3830 | 0.996565 | 244.9295 | 0.841333 | 73.3224 | 1988/03/31 | MPC · JPL | |
| C/1988 F1 | Levy | 12470 | 0.997816 | 537.6264 | 1.174176 | 62.8074 | 1987/11/29 | MPC · JPL | |
| C/1988 J1 | Shoemaker – Holt | 12590 | 0.99783 | 541.2286 | 1.174466 | 62.8066 | 1988/02/14 | MPC · JPL | |
| C/1989 A1 | Yanaka | 53000 | 0.99866 | 1410 | 1.89458 | 52.4092 | 5.1 | 1988/10/31 | MPC · JPL |
| C/1989 A5 | Shoemaker | 12810 | 0.99518 | 547.6156 | 2.639507 | 96.5548 | 1989/02/26 | MPC · JPL | |
| C/1989 T1 | Helin – Roman – Alu | 1190 | 0.990657 | 112.097 | 1.047322 | 46.0369 | 1989/12/15 | MPC · JPL | |
| C/1990 N1 | Tsuchiya-Kiuchi | 3560 | 0.995316 | 233.2246 | 1.092424 | 143.7839 | 1990/09/28 | MPC · JPL | |
| C/1991 A2 | Masaru Arai | 1860 | 0.990507 | 151.0756 | 1.434161 | 70.9783 | 1990/12/10 | MPC · JPL | |
| C/1991 B1 | Shoemaker – Levy | 6520 | 0.993508 | 348.8963 | 2.265035 | 77.2881 | 1991/12/31 | MPC · JPL | |
| C/1991 Q1 | McNaught-Russell | 14310 | 0.994581 | 589.3992 | 3.19395 | 90.5062 | 1992/05/03 | MPC · JPL | |
| C/1991 R1 | McNaught-Russell | 1179000 | 0.999374 | 11160.2875 | 6.98634 | 104.5086 | 1990/11/12 | MPC · JPL | |
| C/1991 T2 | Shoemaker – Levy | 4650000 | 0.999860 | 6000 | 0.8362597 | 113.49709 | 7.7 | 1992/07/24 | MPC · JPL |
| C/1992 F1 | Tanaka – Machholz | 5530 | 0.995966 | 312.7164 | 1.261498 | 79.2924 | 1992/04/22 | MPC · JPL | |
| C/1992 J1 | Spacewatch | 21409400 | 0.999961 | 77102.7179 | 3.007006 | 124.3187 | 1993/09/05 | MPC · JPL | |
| C/1992 U1 | Shoemaker | 246190 | 0.999411 | 3928.1053 | 2.313654 | 65.9859 | 1993/03/25 | MPC · JPL | |
| C/1993 Y1 | McNaught-Russell | 1564 | 0.99356 | 134.8 | 0.8676358 | 51.5866 | 12.2 | 1994/03/31 | MPC · JPL |
| C/1994 E2 | Shoemaker – Levy | 8960 | 0.997314 | 431.4296 | 1.15882 | 131.2547 | 1994/05/27 | MPC · JPL | |
| C/1994 G1-A | Takamizawa-Levy | 61020 | 0.999123 | 1549.8632 | 1.35923 | 132.8728 | 1994/05/22 | MPC · JPL | |
| C/1994 J2 | Takamizawa | 12740 | 0.996429 | 545.4374 | 1.947757 | 135.9611 | 1994/06/29 | MPC · JPL | |
| C/1994 T1 | Machholz | 236170 | 0.999517 | 3820.7081 | 1.845402 | 101.7379 | 1994/10/02 | MPC · JPL | |
| C/1995 O1 | Comet Hale–Bopp | 2534 | 0.9950817 | 185.86 | 0.9141335 | 89.430154 | 2.3 | 1997/04/01 | MPC · JPL |
| C/1995 Q1 | Bradfield | 3280 | 0.998022 | 220.6208 | 0.436388 | 147.3942 | 1995/08/31 | MPC · JPL | |
| C/1996 B1 | Szczepanski | 1965 | 0.99076 | 156.9 | 1.448788 | 51.9189 | 7.1 | 1996/02/06 | MPC · JPL |
| C/1996 B2 | Comet Hyakutake | 108000 | 0.9998987 | 2270 | 0.2302293 | 124.92266 | 7.3 | 1996/05/01 | MPC · JPL |
| C/1996 Q1 | Tabur | 22000 | 0.9989 | 800 | 0.83984 | 73.359 | 11.0 | 1996/11/03 | MPC · JPL |
| C/1996 R1 | Hergenrother – Spahr | 1510 | 0.9856 | 132 | 1.89920 | 145.8144 | 5.8 | 1996/08/28 | MPC · JPL |
| C/1996 R3 | Lagerkvist | 8120.91 | 0.987 | 404.015 | 5.24 | 39.2 | 10.5 | 1995/07/24 | MPC · JPL |
| C/1997 BA6 | Spacewatch | 171000 | 0.998884 | 3081 | 3.436463 | 72.71704 | 4.9 | 1999/11/27 | MPC · JPL |
| C/1997 G2 | Montani | 12160 | 0.99417 | 529 | 3.084966 | 69.83548 | 5.3 | 1998/04/16 | MPC · JPL |
| C/1997 J1 | Mueller | 4085 | 0.990991 | 255.5 | 2.302132 | 122.96833 | 8.6 | 1997/05/03 | MPC · JPL |
| C/1997 L1 | Zhu-Balam | 119000 | 0.99797 | 2420 | 4.89956 | 72.9914 | 6.5 | 1996/11/22 | MPC · JPL |
| C/1997 T1 | Utsunomiya | 27910 | 0.998523 | 920 | 1.3591096 | 127.99262 | 8.0 | 1997/12/10 | MPC · JPL |
| C/1998 H1 | Stonehouse | 19000 | 0.9979 | 710 | 1.48729 | 104.693 | 10.0 | 1998/04/14 | MPC · JPL |
| C/1998 K2 | LINEAR | 182000 | 0.999276 | 3210 | 2.323479 | 64.45667 | 8.6 | 1998/09/01 | MPC · JPL |
| C/1998 K3 | LINEAR | 70000 | 0.9979 | 1700 | 3.5463 | 160.2056 | 10.0 | 1998/03/07 | MPC · JPL |
| C/1998 M1 | LINEAR | 8950 | 0.99277 | 431 | 3.11812 | 20.38455 | 5.4 | 1998/10/28 | MPC · JPL |
| C/1998 M2 | LINEAR | 42400 | 0.997758 | 1215 | 2.725333 | 60.18232 | 8.5 | 1998/08/13 | MPC · JPL |
| C/1998 M4 | LINEAR | 30000 | 0.998 | 1100 | 2.6001 | 154.572 | 9.5 | 1997/12/10 | MPC · JPL |
| C/1998 M5 | LINEAR | 9176 | 0.996025 | 438.3 | 1.7422899 | 82.22889 | 8.0 | 1999/01/24 | MPC · JPL |
| C/1998 M6 | Montani | 400000 | 0.9989 | 5400 | 5.9787 | 91.540 | 7.5 | 1998/10/06 | MPC · JPL |
| C/1998 P1 | Williams | 70000 | 0.999325 | 1700 | 1.146108 | 145.72831 | 8.0 | 1998/10/17 | MPC · JPL |
| C/1998 Q1 | LINEAR | 6770 | 0.99559 | 358 | 1.57788 | 32.3058 | 14.0 | 1998/06/29 | MPC · JPL |
| C/1998 T1 | LINEAR | 67400 | 0.999114 | 1657 | 1.467728 | 170.15995 | 9.5 | 1999/06/25 | MPC · JPL |
| C/1998 U5 | LINEAR | 1043.5 | 0.987981 | 102.88 | 1.2364530 | 131.76474 | 10.9 | 1998/12/21 | MPC · JPL |
| C/1999 A1 | Tilbrook | 2350 | 0.99587 | 177 | 0.730741 | 89.481 | 12.0 | 1999/01/29 | MPC · JPL |
| C/1999 F1 | Catalina (CSS) | 548000 | 0.999136 | 6700 | 5.787022 | 92.03554 | 4.6 | 2002/02/13 | MPC · JPL |
| C/1999 F2 | Dalcanton | 135000 | 0.99821 | 2640 | 4.71807 | 56.42742 | 7.6 | 1998/08/23 | MPC · JPL |
| C/1999 H1 | Lee | 146200 | 0.9997449 | 2775 | 0.70810722 | 149.35290 | 9.4 | 1999/07/11 | MPC · JPL |
| C/1999 J3 | LINEAR | 64000 | 0.99939 | 1600 | 0.976809 | 101.6561 | 11.3 | 1999/09/20 | MPC · JPL |
| C/1999 K2 | Ferris | 1920 | 0.9658 | 155 | 5.2903 | 82.191 | 7.0 | 1999/04/10 | MPC · JPL |
| C/1999 K3 | LINEAR | 3600 | 0.9918 | 235 | 1.92878 | 92.274 | 12.0 | 1999/02/27 | MPC · JPL |
| C/1999 K6 | LINEAR | 6459 | 0.993532 | 346.8 | 2.246976 | 46.34384 | 11.3 | 1999/07/24 | MPC · JPL |
| C/1999 K7 | LINEAR | 18000 | 0.9966 | 700 | 2.3227 | 135.159 | 13.0 | 1999/02/24 | MPC · JPL |
| C/1999 L2 | LINEAR | 7800 | 0.9951 | 390 | 1.90476 | 43.942 | 13.0 | 1999/08/04 | MPC · JPL |
| C/1999 N2 | Lynn | 5150 | 0.99745 | 298 | 0.7612844 | 111.6559 | 10.3 | 1999/07/23 | MPC · JPL |
| C/1999 T1 | McNaught – Hartley | 740000 | 0.999856 | 8100 | 1.1716989 | 79.97521 | 8.6 | 2000/12/13 | MPC · JPL |
| C/2000 B2 | LINEAR | 500000 | 0.9994 | 6000 | 3.7762 | 93.647 | 10.3 | 1999/11/10 | MPC · JPL |
| C/2000 CT54 | LINEAR | 83900 | 0.998353 | 1916 | 3.155967 | 49.21252 | 7.4 | 2001/06/19 | MPC · JPL |
| C/2000 K2 | LINEAR | 11930 | 0.995332 | 522.0 | 2.437066 | 25.63358 | 9.3 | 2000/10/11 | MPC · JPL |
| C/2000 Y2 | Skiff | 10850 | 0.99435 | 490 | 2.76871 | 12.0875 | 11.4 | 2001/03/21 | MPC · JPL |
| C/2001 A1 | LINEAR | 4330 | 0.99095 | 266 | 2.4064 | 59.941 | 12.7 | 2000/09/17 | MPC · JPL |
| C/2001 A2-A | LINEAR | 130000 | 0.99969 | 2500 | 0.779054 | 36.487 | 13 | 2001/05/24 | MPC · JPL |
| C/2001 A2-B | LINEAR | 37400 | 0.999304 | 1119 | 0.7790172 | 36.47582 | 7 | 2001/05/24 | MPC · JPL |
| C/2001 C1 | LINEAR | 7000000 | 0.99987 | 38000 | 5.10432 | 68.96470 | 6.5 | 2002/03/28 | MPC · JPL |
| C/2001 HT50 | LINEAR-NEAT | 41230 | 0.9976606 | 1193.5 | 2.7920832 | 163.212126 | 7.4 | 2003/07/09 | MPC · JPL |
| C/2001 K3 | Skiff | 153000 | 0.99893 | 2870 | 3.06012 | 52.0265 | 9.4 | 2001/04/22 | MPC · JPL |
| C/2001 K5 | LINEAR | 1220000 | 0.999546 | 11410 | 5.184246 | 72.590342 | 4.4 | 2002/10/11 | MPC · JPL |
| C/2001 O2 | NEAT | 103000 | 0.9978 | 2200 | 4.8194 | 90.9262 | 6.6 | 1999/10/17 | MPC · JPL |
| C/2001 Q1 | NEAT | 2241 | 0.96593 | 171.2 | 5.83397 | 66.9504 | 7.7 | 2001/09/20 | MPC · JPL |
| C/2001 U6 | LINEAR | 39000 | 0.99617 | 1149 | 4.40642 | 107.25550 | 6.5 | 2002/08/08 | MPC · JPL |
| C/2001 W1 | LINEAR | 100000 | 0.9989 | 2100 | 2.39924 | 118.645 | 13.7 | 2001/12/24 | MPC · JPL |
| C/2001 X1 | LINEAR | 13500 | 0.99700 | 570 | 1.69793 | 115.6268 | 11.3 | 2002/01/08 | MPC · JPL |
| C/2002 B2 | LINEAR | 50000 | 0.9972 | 1400 | 3.8422 | 152.8726 | 10.1 | 2002/04/06 | MPC · JPL |
| C/2002 C2 | LINEAR | 860000 | 0.99964 | 9000 | 3.25375 | 104.88143 | 9.9 | 2002/04/10 | MPC · JPL |
| C/2002 F1 | Utsunomiya | 29300 | 0.999539 | 950 | 0.4382989 | 80.8770 | 10.5 | 2002/04/22 | MPC · JPL |
| C/2002 H2 | LINEAR | 4570 | 0.99407 | 276 | 1.63484 | 110.5011 | 10.5 | 2002/03/23 | MPC · JPL |
| C/2002 J4 | NEAT | 4900000 | 0.999874 | 29000 | 3.633722 | 46.52550 | 8.4 | 2003/10/03 | MPC · JPL |
| C/2002 K1 | NEAT | 900000 | 0.9997 | 9000 | 3.23024 | 89.723 | 11.4 | 2002/06/16 | MPC · JPL |
| C/2002 K2 | LINEAR | 21100 | 0.99314 | 763 | 5.23506 | 130.8957 | 8.2 | 2002/06/05 | MPC · JPL |
| C/2002 L9 | NEAT | 297000 | 0.99842 | 4460 | 7.03301 | 68.44211 | 4.7 | 2004/04/05 | MPC · JPL |
| C/2002 O6 | SWAN | 6500 | 0.99858 | 350 | 0.494648 | 58.6240 | 13.0 | 2002/09/09 | MPC · JPL |
| C/2002 P1 | NEAT | 8420 | 0.98422 | 414 | 6.5302 | 34.6061 | 8.2 | 2001/11/23 | MPC · JPL |
| C/2002 Q3-A | LINEAR | 10038.16 | 0.997194 | 465.333 | 1.30583 | 96.87858 | 16.4 | 2002/08/19 | MPC · JPL |
| C/2002 V1 | NEAT | 32100 | 0.9999018 | 1011 | 0.0992581 | 81.70600 | 10.4 | 2003/02/18 | MPC · JPL |
| C/2002 V2 | LINEAR | 355000 | 0.99864 | 5010 | 6.81203 | 166.77622 | 8.4 | 2003/03/13 | MPC · JPL |
| C/2002 VQ94 | LINEAR | 2874.1 | 0.966377 | 202.14 | 6.796713 | 70.51612 | 7.1 | 2006/02/06 | MPC · JPL |
| C/2002 X1 | LINEAR | 51020 | 0.998192 | 1376 | 2.4867001 | 164.08943 | 9.8 | 2003/07/12 | MPC · JPL |
| C/2002 X5 | Kudo-Fujikawa | 42000 | 0.999843 | 1210 | 0.189935 | 94.15226 | 10.6 | 2003/01/29 | MPC · JPL |
| C/2002 Y1 | Juels – Holvorcem | 3967 | 0.997152 | 250.6 | 0.7138096 | 103.78154 | 9.8 | 2003/04/13 | MPC · JPL |
| C/2003 G2 | LINEAR | 9000 | 0.9965 | 440 | 1.55337 | 96.167 | 16.0 | 2003/04/29 | MPC · JPL |
| C/2003 H1 | LINEAR | 136700 | 0.999156 | 2653 | 2.2396301 | 138.667242 | 8.7 | 2004/02/22 | MPC · JPL |
| C/2003 H3 | NEAT | 1510000 | 0.999780 | 13200 | 2.901441 | 42.81171 | 9.6 | 2003/04/24 | MPC · JPL |
| C/2003 J1 | NEAT | 13900 | 0.99112 | 577 | 5.12542 | 98.3135 | 8.8 | 2003/10/10 | MPC · JPL |
| C/2003 L2 | LINEAR | 1918.7 | 0.981446 | 154.40 | 2.864801 | 82.05107 | 9.9 | 2004/01/19 | MPC · JPL |
| C/2003 T2 | LINEAR | 520000 | 0.99972 | 6400 | 1.786352 | 87.5315 | 9.8 | 2003/11/14 | MPC · JPL |
| C/2003 T3 | Tabur | 434000 | 0.999742 | 5730 | 1.4810758 | 50.44443 | 5.8 | 2004/04/29 | MPC · JPL |
| C/2003 V1 | LINEAR | 14800 | 0.99704 | 603 | 1.78314 | 28.67513 | 9.9 | 2003/03/11 | MPC · JPL |
| C/2004 F2 | LINEAR | 1870 | 0.99056 | 151.6 | 1.43044 | 104.9600 | 13.2 | 2003/12/26 | MPC · JPL |
| C/2004 F4 | Bradfield | 3680 | 0.999294 | 238 | 0.168266 | 63.16456 | 11.3 | 2004/04/17 | MPC · JPL |
| C/2004 G1 | LINEAR | 5953.27 | 0.996 | 328.47 | 1.201 | 114.486 | 14.4 | 2004/06/04 | MPC · JPL |
| C/2004 K1 | Catalina (CSS) | 77600 | 0.998131 | 1819 | 3.399147 | 153.747521 | 7.9 | 2005/07/05 | MPC · JPL |
| C/2004 L1 | LINEAR | 25100 | 0.997615 | 858 | 2.04741344 | 159.36082 | 12.6 | 2005/03/30 | MPC · JPL |
| C/2004 L2 | LINEAR | 22190 | 0.995215 | 790 | 3.778629 | 62.51864 | 8.3 | 2005/11/15 | MPC · JPL |
| C/2004 P1 | NEAT | 720000 | 0.99925 | 8100 | 6.01377 | 28.8163 | 10.1 | 2003/08/08 | MPC · JPL |
| C/2004 Q1 | Tucker | 2552.8 | 0.989042 | 186.78 | 2.0467255 | 56.08768 | 9.8 | 2004/12/06 | MPC · JPL |
| C/2004 Q2 | Comet Machholz | 117800 | 0.9994986 | 2403 | 1.2050414 | 38.588963 | 9.9 | 2005/01/24 | MPC · JPL |
| C/2004 RG113 | LINEAR | 18540 | 0.997227 | 700 | 1.942359 | 21.61823 | 13.9 | 2005/03/03 | MPC · JPL |
| C/2004 T3 | Siding Spring | 420000 | 0.99842 | 5600 | 8.8644 | 71.9642 | 6.6 | 2003/04/15 | MPC · JPL |
| C/2004 U1 | LINEAR | 217000 | 0.999264 | 3610 | 2.659321 | 130.62532 | 9.0 | 2004/12/08 | MPC · JPL |
| C/2004 X2 | LINEAR | 55000 | 0.99738 | 1450 | 3.79308 | 72.118 | 10.2 | 2004/08/24 | MPC · JPL |
| C/2004 YJ35 | LINEAR | 1500000 | 0.99987 | 13000 | 1.781202 | 52.47641 | 17.3 | 2005/03/03 | MPC · JPL |
| C/2005 G1 | LINEAR | 2600000 | 0.99974 | 18800 | 4.960798 | 108.41395 | 7.7 | 2006/02/27 | MPC · JPL |
| C/2005 L3 | McNaught | 1550000 | 0.999582 | 13390 | 5.593622 | 139.449248 | 6.4 | 2008/01/16 | MPC · JPL |
| C/2005 N1 | Juels – Holvorcem | 19700 | 0.998457 | 729 | 1.125447 | 51.18017 | 11.3 | 2005/08/22 | MPC · JPL |
| C/2005 R4 | LINEAR | 94000 | 0.99749 | 2067 | 5.188473 | 164.01260 | 7.7 | 2006/03/08 | MPC · JPL |
| C/2005 S4 | McNaught | 430000 | 0.998972 | 5690 | 5.850109 | 107.95897 | 7.9 | 2007/07/18 | MPC · JPL |
| C/2005 X1 | Beshore | 18000 | 0.9958 | 690 | 2.8623 | 91.944 | 11.1 | 2005/07/05 | MPC · JPL |
| C/2005 YW | LINEAR | 2628 | 0.989534 | 190.4 | 1.9930109 | 40.54361 | 7.4 | 2006/12/07 | MPC · JPL |
| C/2006 A1 | Pojmański | 115000 | 0.999765 | 2370 | 0.5553959 | 92.73611 | 10.5 | 2006/02/22 | MPC · JPL |
| C/2006 A2 | Catalina (CSS) | 240000 | 0.99862 | 3800 | 5.3160 | 148.3226 | 9.8 | 2005/05/20 | MPC · JPL |
| C/2006 B1 | McNaught | 49100 | 0.99776 | 1340 | 2.997591 | 134.28193 | 10.3 | 2005/11/19 | MPC · JPL |
| C/2006 CK10 | Catalina (CSS) | 3182 | 0.991900 | 216.32 | 1.7521694 | 144.26278 | 12.3 | 2006/07/03 | MPC · JPL |
| C/2006 K4 | NEAT | 77500 | 0.998246 | 1818 | 3.188618 | 111.33346 | 8.8 | 2007/11/29 | MPC · JPL |
| C/2006 L1 | Garradd | 12930 | 0.997345 | 551 | 1.462070 | 143.24257 | 8.6 | 2006/10/18 | MPC · JPL |
| C/2006 M1 | LINEAR | 1905.0 | 0.976859 | 153.67 | 3.556199 | 54.87693 | 9.6 | 2007/02/13 | MPC · JPL |
| C/2006 O2 | Garradd | 8700 | 0.99634 | 420 | 1.55479 | 43.0287 | 12.7 | 2006/10/05 | MPC · JPL |
| C/2006 Q1 | McNaught | 571000 | 0.9995986 | 6890 | 2.7637144 | 59.050380 | 7.0 | 2008/07/03 | MPC · JPL |
| C/2006 U6 | Spacewatch | 84900 | 0.998706 | 1931 | 2.4983978 | 84.87894 | 8.8 | 2008/06/05 | MPC · JPL |
| C/2006 V1 | Catalina (CSS) | 4136 | 0.989618 | 257.6 | 2.674906 | 31.11947 | 9.0 | 2007/11/26 | MPC · JPL |
| C/2006 W3 | Christensen | 2410000 | 0.9998262 | 17990 | 3.1262325 | 127.074692 | 6.7 | 2009/07/06 | MPC · JPL |
| C/2006 WD4 | Lemmon | 14110 | 0.998987 | 583.8 | 0.5912444 | 152.70463 | 17.4 | 2007/04/28 | MPC · JPL |
| C/2006 XA1 | LINEAR | 4000 | 0.992839 | 252.0 | 1.804374 | 30.62941 | 7.4 | 2007/07/21 | MPC · JPL |
| C/2007 B2 | Skiff | 20020 | 0.995965 | 737.2 | 2.9749171 | 27.49527 | 8.1 | 2008/08/20 | MPC · JPL |
| C/2007 D1 | LINEAR | too uncertain to determine | 0.99995 | 171366.7 | 8.793 | 41.50701 | 8.9 | 2007/06/18 | MPC · JPL |
| C/2007 D3 | LINEAR | 16650 | 0.99201 | 652 | 5.20897 | 45.92022 | 9.2 | 2007/05/27 | MPC · JPL |
| C/2007 E2 | Lovejoy | 49000 | 0.99918 | 1330 | 1.092939 | 95.8830 | 10.9 | 2007/03/27 | MPC · JPL |
| C/2007 K1 | Lemmon | 9100 | 0.97880 | 436 | 9.23905 | 108.4325 | 8.6 | 2007/05/07 | MPC · JPL |
| C/2007 K6 | McNaught | 3350 | 0.9847 | 224 | 3.4330 | 105.064 | 10.6 | 2007/07/01 | MPC · JPL |
| C/2007 M1 | McNaught | 61900 | 0.99522 | 1564 | 7.47465 | 139.72142 | 5.6 | 2008/08/11 | MPC · JPL |
| C/2007 M2 | Catalina (CSS) | 392000 | 0.999339 | 5360 | 3.541050 | 80.94565 | 9.0 | 2008/12/08 | MPC · JPL |
| C/2007 M3 | LINEAR | 2245 | 0.979768 | 171.45 | 3.468759 | 161.76086 | 9.9 | 2007/09/04 | MPC · JPL |
| C/2007 N3 | Lulin | 19500000 | 0.9999833 | 72000 | 1.21225837 | 178.373611 | 9.7 | 2009/01/10 | MPC · JPL |
| C/2007 T1 | McNaught | 256000 | 0.999760 | 4040 | 0.9685028 | 117.64244 | 11.1 | 2007/12/12 | MPC · JPL |
| C/2007 VO53 | Spacewatch | 1350000 | 0.999603 | 12200 | 4.842732 | 86.99476 | 7.1 | 2010/04/26 | MPC · JPL |
| C/2007 Y2 | McNaught | 42100 | 0.99652 | 1210 | 4.20896 | 98.50321 | 9.2 | 2008/04/08 | MPC · JPL |
| C/2008 C1 | Chen-Gao | 32398532.38 | 0.9999876 | 101627.54 | 1.262343 | 61.7845 | 11.7 | 2008/04/16 | MPC · JPL |
| C/2008 E3 | Garradd | 229000 | 0.99852 | 3740 | 5.53103 | 105.07653 | 5.1 | 2008/08/02 | MPC · JPL |
| C/2008 G1 | Gibbs | 6980 | 0.98908 | 365 | 3.9898 | 72.856 | 10.5 | 2009/01/11 | MPC · JPL |
| C/2008 J1 | Boattini | 2140.1 | 0.989617 | 166.07 | 1.7242934 | 61.78002 | 8.8 | 2008/07/13 | MPC · JPL |
| C/2008 L3 | Hill | 5900 | 0.9939 | 330 | 2.0113 | 100.201 | 10.6 | 2008/04/22 | MPC · JPL |
| C/2008 N1 | Holmes | 30360 | 0.997140 | 973.1 | 2.7835117 | 115.52100 | 9.9 | 2009/09/25 | MPC · JPL |
| C/2008 Q1 | Maticic | 14460 | 0.995015 | 593.6 | 2.959143 | 118.62662 | 9.8 | 2008/12/30 | MPC · JPL |
| C/2008 Q3 | Garradd | 840000 | 0.999799 | 8900 | 1.7982291 | 140.70663 | 6.1 | 2009/06/23 | MPC · JPL |
| C/2009 F1 | Larson | 1090 | 0.9827 | 106 | 1.8307 | 171.3755 | 15.1 | 2009/06/25 | MPC · JPL |
| C/2009 F2 | McNaught | 6440 | 0.98303 | 346.1 | 5.87503 | 59.36694 | 4.9 | 2009/11/14 | MPC · JPL |
| C/2009 F6 | Yi-SWAN | 11590 | 0.997512 | 512.2 | 1.274159 | 85.76481 | 9.7 | 2009/05/07 | MPC · JPL |
| C/2009 K2 | Catalina (CSS) | 55800 | 0.997776 | 1460 | 3.246173 | 66.82192 | 11.8 | 2010/02/07 | MPC · JPL |
| C/2009 O2 | Catalina (CSS) | 4643 | 0.997501 | 278.3 | 0.6955493 | 107.96052 | 12.3 | 2010/03/24 | MPC · JPL |
| C/2009 T1 | McNaught | 223000 | 0.99831 | 3680 | 6.22041 | 89.89396 | 8.5 | 2009/10/08 | MPC · JPL |
| C/2009 T3 | LINEAR | 282000 | 0.999470 | 4300 | 2.281140 | 148.74183 | 13.5 | 2010/01/12 | MPC · JPL |
| C/2009 U3 | Hill | 2175 | 0.991575 | 167.88 | 1.414424 | 51.26077 | 12.6 | 2010/03/20 | MPC · JPL |
| C/2009 U5 | Grauer | 1090000 | 0.99943 | 10600 | 6.09424 | 25.4726 | 9.1 | 2010/06/22 | MPC · JPL |
| C/2009 W2 | Boattini | 1900000 | 0.99956 | 16000 | 6.90713 | 164.49053 | 6.9 | 2010/05/01 | MPC · JPL |
| C/2009 Y1 | Catalina (CSS) | 7273 | 0.993285 | 375.4 | 2.5204945 | 107.31660 | 6.5 | 2011/01/28 | MPC · JPL |
| C/2010 A4 | Siding Spring | 5001 | 0.990638 | 292.4 | 2.737999 | 96.73015 | 7.4 | 2010/10/08 | MPC · JPL |
| C/2010 B1 | Cardinal | 158700 | 0.998997 | 2932 | 2.9414900 | 101.97777 | 10.0 | 2011/02/07 | MPC · JPL |
| C/2010 D3 | WISE | 1250000 | 0.99963 | 11600 | 4.24754 | 76.39488 | 10.0 | 2010/09/03 | MPC · JPL |
| C/2010 E1 | Garradd | 1160 | 0.9759 | 110.4 | 2.66219 | 71.698 | 11.8 | 2009/11/07 | MPC · JPL |
| C/2010 FB87 | WISE-Garradd | 5177 | 0.990500 | 299.3 | 2.842764 | 107.62532 | 8.5 | 2010/11/07 | MPC · JPL |
| C/2010 G1 | Boattini | 10000 | 0.9975 | 480 | 1.20455 | 78.3870 | 13.1 | 2010/04/02 | MPC · JPL |
| C/2010 G3 | WISE | 135000 | 0.99814 | 2630 | 4.90765 | 108.26760 | 8.9 | 2010/04/11 | MPC · JPL |
| C/2010 H1 | Garradd | 800000 | 0.99967 | 8400 | 2.74555 | 36.5317 | 12.4 | 2010/06/18 | MPC · JPL |
| C/2010 J2 | McNaught | 500000 | 0.999460 | 6300 | 3.386994 | 125.85156 | 10.4 | 2010/06/03 | MPC · JPL |
| C/2010 L3 | Catalina (CSS) | 1400000 | 0.99923 | 12800 | 9.88290 | 102.63105 | 4.7 | 2010/11/10 | MPC · JPL |
| C/2011 A3 | Gibbs | 39900 | 0.997992 | 1167 | 2.344839 | 26.07435 | 9.7 | 2011/12/16 | MPC · JPL |
| C/2011 C1 | McNaught | 6380 | 0.997433 | 344.1 | 0.8833784 | 16.82561 | 12.7 | 2011/04/18 | MPC · JPL |
| C/2011 C3 | Gibbs | 5700 | 0.99527 | 320 | 1.51689 | 49.3760 | 14.1 | 2011/04/07 | MPC · JPL |
| C/2011 F1 | LINEAR | 146000 | 0.999345 | 2780 | 1.818266 | 56.61904 | 8.3 | 2013/01/07 | MPC · JPL |
| C/2011 N2 | McNaught | too uncertain to determine | 0.9997 | 10000 | 2.5634 | 33.675 | 6.3 | 2011/10/18 | MPC · JPL |
| C/2011 O1 | LINEAR | 42100 | 0.996785 | 1210 | 3.890653 | 76.49889 | 7.2 | 2012/08/18 | MPC · JPL |
| C/2011 Q1 | PANSTARRS | 190000 | 0.9979 | 3300 | 6.78009 | 94.8620 | 7.5 | 2011/06/29 | MPC · JPL |
| C/2012 A2 | LINEAR | 30590 | 0.996384 | 978.2 | 3.5374738 | 125.868509 | 8.4 | 2012/11/05 | MPC · JPL |
| C/2012 C1 | McNaught | 45500 | 0.99620 | 1274 | 4.837975 | 96.27770 | 5.4 | 2013/02/04 | MPC · JPL |
| C/2012 CH17 | MOSS | 52335655.79 | 0.999991 | 139913.5 | 1.296092 | 27.74418 | 11.1 | 2012/09/28 | MPC · JPL |
| C/2012 E1 | Hill | 231000 | 0.99801 | 3760 | 7.50290 | 122.54208 | 5.7 | 2011/07/04 | MPC · JPL |
| C/2012 E3 | PANSTARRS | 3280 | 0.9827 | 221 | 3.8274 | 105.658 | 9.9 | 2011/05/12 | MPC · JPL |
| C/2012 F6 | Lemmon | 10750 | 0.9984987 | 487.1 | 0.7312382 | 82.60885 | 5.5 | 2013/03/24 | MPC · JPL |
| C/2012 K5 | LINEAR | 21550 | 0.9985256 | 774.4 | 1.14181083 | 92.848032 | 10.5 | 2012/11/28 | MPC · JPL |
| C/2012 K6 | McNaught | 265000 | 0.999188 | 4130 | 3.353033 | 135.21497 | 8.8 | 2013/05/21 | MPC · JPL |
| C/2012 L1 | LINEAR | 21250 | 0.997051 | 767.3 | 2.262410 | 87.21917 | 11.9 | 2012/12/25 | MPC · JPL |
| C/2012 L2 | LINEAR | 13370 | 0.997322 | 563.4 | 1.5085342 | 70.98049 | 9.5 | 2013/05/09 | MPC · JPL |
| C/2012 L3 | LINEAR | 6020 | 0.99079 | 331 | 3.04503 | 134.19664 | 9.0 | 2012/06/12 | MPC · JPL |
| C/2012 LP26 | Palomar | 505000 | 0.99897 | 6350 | 6.53605 | 25.37958 | 8.8 | 2015/08/16 | MPC · JPL |
| C/2012 OP | Siding Spring | 34200 | 0.99658 | 1054 | 3.60707 | 114.82872 | 11.2 | 2012/12/04 | MPC · JPL |
| C/2012 S4 | PANSTARRS | 126673944.62 | 0.999983 | 252223.8 | 4.34873 | 126.54131 | 9.2 | 2013/06/28 | MPC · JPL |
| C/2012 T4 | McNaught | 1200 | 0.983 | 110 | 1.953 | 24.092 | 12.7 | 2012/10/10 | MPC · JPL |
| C/2012 U1 | PANSTARRS | 1350000 | 0.99957 | 12200 | 5.26390 | 56.33902 | 8.3 | 2014/07/04 | MPC · JPL |
| C/2012 V1 | PANSTARRS | 230000 | 0.99945 | 3800 | 2.0890 | 157.8399 | 11.5 | 2013/07/21 | MPC · JPL |
| C/2012 V2 | LINEAR | 15320 | 0.997641 | 616.7 | 1.4547602 | 67.18470 | 8.4 | 2013/08/16 | MPC · JPL |
| C/2012 X1 | LINEAR | 1962 | 0.989803 | 156.71 | 1.597956 | 44.36218 | 5.7 | 2014/02/21 | MPC · JPL |
| C/2013 E2 | Iwamoto | 3558 | 0.993936 | 233.07 | 1.413322 | 21.85771 | 10.6 | 2013/03/09 | MPC · JPL |
| C/2013 F2 | Catalina (CSS) | 770000 | 0.99926 | 8400 | 6.21785 | 61.74927 | 7.1 | 2013/04/19 | MPC · JPL |
| C/2013 F3 | McNaught | 20900 | 0.99703 | 759 | 2.252612 | 85.4445 | 12.3 | 2013/05/25 | MPC · JPL |
| C/2013 G5 | Catalina (CSS) | 140000 | 0.99965 | 2700 | 0.92894 | 40.617 | 14.5 | 2013/09/01 | MPC · JPL |
| C/2013 G6 | Lemmon | 7620 | 0.994708 | 387.1 | 2.048499 | 124.08435 | 6.8 | 2013/07/25 | MPC · JPL |
| C/2013 G7 | McNaught | 102200 | 0.99786 | 2190 | 4.677404 | 105.11012 | 6.2 | 2014/03/18 | MPC · JPL |
| C/2013 G8 | PANSTARRS | 193000 | 0.99846 | 3340 | 5.14118 | 27.61506 | 8.4 | 2013/11/14 | MPC · JPL |
| C/2013 H1 | La Sagra | 2445 | 0.98542 | 181.5 | 2.64696 | 27.0895 | 6.2 | 2013/05/19 | MPC · JPL |
| C/2013 J3 | McNaught | 86000 | 0.99795 | 1950 | 3.98869 | 118.2255 | 5.8 | 2013/02/22 | MPC · JPL |
| C/2013 J5 | Boattini | too uncertain to determine | 0.999 | 10000 | 4.9049 | 136.011 | 10.0 | 2012/11/29 | MPC · JPL |
| C/2013 O3 | McNaught | 23400 | 0.99612 | 819 | 3.18010 | 102.83974 | 11.1 | 2013/09/09 | MPC · JPL |
| C/2013 P2 | PANSTARRS | 132000 | 0.998904 | 2590 | 2.834925 | 125.53216 | 11.8 | 2014/02/17 | MPC · JPL |
| C/2013 R1 | Lovejoy | 11702 | 0.9984250 | 515.4 | 0.81182562 | 64.04094 | 11.6 | 2013/12/22 | MPC · JPL |
| C/2013 TW5 | Spacewatch | 9570 | 0.98707 | 450.8 | 5.83064 | 31.40046 | 6.7 | 2014/08/17 | MPC · JPL |
| C/2013 U2 | Holvorcem | 26590 | 0.99426 | 891 | 5.116745 | 43.09366 | 5.3 | 2014/10/25 | MPC · JPL |
| C/2013 V5 | Oukaimeden | 10784 | 0.9987183 | 488.1 | 0.6255811 | 154.88544 | 10.8 | 2014/09/28 | MPC · JPL |
| C/2013 Y2 | PANSTARRS | 3262 | 0.991275 | 219.9 | 1.919086 | 29.41474 | 9.7 | 2014/06/13 | MPC · JPL |
| C/2014 A5 | PANSTARRS | 1879 | 0.96848 | 152.3 | 4.79991 | 31.9046 | 11.6 | 2014/08/14 | MPC · JPL |
| C/2014 C3 | NEOWISE | 1129 | 0.98283 | 108.4 | 1.86203 | 151.7843 | 12.0 | 2014/01/16 | MPC · JPL |
| C/2014 E2 | Jacques | 18060 | 0.999035 | 688 | 0.6639172 | 156.392752 | 10.4 | 2014/07/02 | MPC · JPL |
| C/2014 F1 | Hill | 210000 | 0.9990 | 3600 | 3.49638 | 108.2529 | 10.4 | 2013/10/04 | MPC · JPL |
| C/2014 F2 | Tenagra | 1804 | 0.97089 | 148.20 | 4.314460 | 119.06119 | 5.6 | 2015/01/02 | MPC · JPL |
| C/2014 G1 | PANSTARRS | 30000 | 0.9943 | 1000 | 5.4685 | 165.6403 | 6.0 | 2013/11/06 | MPC · JPL |
| C/2014 H1 | Christensen | 1700 | 0.9849 | 141 | 2.1389 | 99.936 | 14.8 | 2014/04/15 | MPC · JPL |
| C/2014 M2 | Christensen | 30500 | 0.99293 | 980 | 6.9085 | 32.4062 | 7.9 | 2014/07/18 | MPC · JPL |
| C/2014 M3 | Catalina (CSS) | 1630 | 0.9824 | 138 | 2.43428 | 164.90964 | 12.9 | 2014/06/21 | MPC · JPL |
| C/2014 N2 | PANSTARRS | 330000 | 0.99954 | 4700 | 2.184401 | 133.0132 | 12.0 | 2014/10/08 | MPC · JPL |
| C/2014 N3 | NEOWISE | 442000 | 0.999331 | 5800 | 3.882231 | 61.63825 | 4.7 | 2015/03/13 | MPC · JPL |
| C/2014 OE4 | PANSTARRS | 2957246.18 | 0.99969 | 20602.48 | 6.2444 | 81.3473 | 7.6 | 2016/12/10 | MPC · JPL |
| C/2014 Q1 | PANSTARRS | 38000 | 0.999721 | 1129 | 0.314570 | 43.10685 | 9.8 | 2015/07/06 | MPC · JPL |
| C/2014 Q2 | Lovejoy | 13946 | 0.9977728 | 579.4 | 1.2903578 | 80.301302 | 7.9 | 2015/01/30 | MPC · JPL |
| C/2014 Q6 | PANSTARRS | too uncertain to determine | 0.999386 | 6883 | 4.222 | 49.7968 | 6.5 | 2015/01/06 | MPC · JPL |
| C/2014 QU2 | PANSTARRS | 4100 | 0.9913 | 260 | 2.2233 | 124.818 | 13.3 | 2014/07/09 | MPC · JPL |
| C/2014 R1 | Borisov | 2403 | 0.992501 | 179.4 | 1.345431 | 9.93289 | 9.8 | 2014/11/19 | MPC · JPL |
| C/2014 R3 | PANSTARRS | 1734251.91 | 0.9995 | 14434.53 | 7.2756 | 90.84 | 6.3 | 2016/08/08 | MPC · JPL |
| C/2014 R4 | Gibbs | 180000 | 0.99943 | 3200 | 1.81797 | 42.4116 | 8.7 | 2014/10/21 | MPC · JPL |
| C/2014 S2 | PANSTARRS | 2210.9 | 0.987622 | 169.71 | 2.100644 | 64.67037 | 5.0 | 2015/12/09 | MPC · JPL |
| C/2014 U3 | Kowalski | 40000 | 0.9976 | 1100 | 2.5588 | 152.9921 | 12.4 | 2014/09/03 | MPC · JPL |
| C/2014 W2 | PANSTARRS | 64570 | 0.998341 | 1610 | 2.6702156 | 81.998347 | 7.9 | 2016/03/10 | MPC · JPL |
| C/2014 W8 | PANSTARRS | 2305.52 | 0.9711 | 174.518 | 5.044 | 42.111 | 10.5 | 2015/09/08 | MPC · JPL |
| C/2014 XB8 | PANSTARRS | 27100 | 0.99666 | 902 | 3.01028 | 149.7827 | 6.8 | 2015/04/05 | MPC · JPL |
| C/2015 C2 | SWAN | 10200 | 0.99849 | 471 | 0.711372 | 94.5013 | 14.9 | 2015/03/04 | MPC · JPL |
| C/2015 ER61 | PANSTARRS | 57200 | 0.999295 | 1484 | 1.046217 | 6.25965 | 7.9 | 2017/05/09 | MPC · JPL |
| C/2015 F3 | SWAN | 3530 | 0.99640 | 232 | 0.83444 | 73.3865 | 14.2 | 2015/03/09 | MPC · JPL |
| C/2015 F4 | Jacques | 1255.3 | 0.985873 | 116.37 | 1.6439255 | 48.70495 | 11.4 | 2015/08/10 | MPC · JPL |
| C/2015 J2 | PANSTARRS | 3880 | 0.98250 | 246.9 | 4.32039 | 17.28183 | 10.1 | 2015/09/08 | MPC · JPL |
| C/2015 K1 | MASTER | 2426 | 0.98584 | 180.6 | 2.55749 | 29.3817 | 9.1 | 2014/10/13 | MPC · JPL |
| C/2015 K2 | PANSTARRS | 4200 | 0.9944 | 260 | 1.45527 | 29.110 | 20.7 | 2015/06/08 | MPC · JPL |
| C/2015 M1 | PANSTARRS | 8000 | 0.9946 | 390 | 2.0916 | 57.310 | 15.9 | 2015/05/15 | MPC · JPL |
| C/2015 M3 | PANSTARRS | 1533 | 0.97328 | 133.0 | 3.55241 | 65.95107 | 11.5 | 2015/08/26 | MPC · JPL |
| C/2015 O1 | PANSTARRS | too uncertain to determine | 0.999994 | 651202.3 | 3.7296 | 127.211 | 7.2 | 2018/02/19 | MPC · JPL |
| C/2015 R3 | PANSTARRS | 190000 | 0.9985 | 3400 | 4.9033 | 83.6135 | 5.0 | 2014/02/11 | MPC · JPL |
| C/2015 TQ209 | LINEAR | 58000 | 0.99906 | 1500 | 1.41314 | 11.3925 | 10.8 | 2016/08/27 | MPC · JPL |
| C/2015 V3 | PANSTARRS | 23600 | 0.99485 | 822 | 4.23569 | 86.2318 | 6.3 | 2015/11/24 | MPC · JPL |
| C/2015 WZ | PANSTARRS | 2685 | 0.992873 | 193.16 | 1.3766377 | 134.13494 | 10.5 | 2016/04/15 | MPC · JPL |
| C/2015 Y1 | LINEAR | 5000 | 0.99141 | 292.5 | 2.514080 | 71.2196 | 6.7 | 2016/05/15 | MPC · JPL |
| C/2016 A5 | PANSTARRS | 43000 | 0.9976 | 1200 | 2.9469 | 40.319 | 12.8 | 2015/06/28 | MPC · JPL |
| C/2016 A6 | PANSTARRS | 3208.44 | 0.9889 | 217.53 | 2.4124 | 120.92 | 7.8 | 2015/11/05 | MPC · JPL |
| C/2016 B1 | NEOWISE | 9700 | 0.99293 | 453 | 3.20625 | 50.4644 | 5.9 | 2016/12/04 | MPC · JPL |
| C/2016 E2 | Kowalski | 1636.74 | 0.992 | 138.88 | 1.074 | 135.95 | 19.5 | 2016/02/06 | MPC · JPL |
| C/2016 J2 | Denneau | too uncertain to determine | 0.998 | 700 | 1.5184 | 130.343 | 15.3 | 2016/04/11 | MPC · JPL |
| C/2016 KA | Catalina (CSS) | 400000 | 0.9990 | 6000 | 5.4009 | 104.6293 | 8.8 | 2016/02/01 | MPC · JPL |
| C/2016 M1 | PANSTARRS | 74000 | 0.99875 | 1760 | 2.21103 | 90.99839 | 8.1 | 2018/08/10 | MPC · JPL |
| C/2016 N4 | MASTER | 387525 | 0.99940 | 5315.30 | 3.19912 | 72.5573 | 11.1 | 2017/09/16 | MPC · JPL |
| C/2016 N6 | PANSTARRS | 67000 | 0.9984 | 1600 | 2.6699 | 105.8345 | 5.0 | 2018/07/18 | MPC · JPL |
| C/2016 P4 | PANSTARRS | 5900 | 0.9819 | 330 | 5.888 | 29.89 | 10.7 | 2016/10/16 | MPC · JPL |
| C/2016 Q2 | PANSTARRS | 404254.11 | 0.9987 | 5467.19 | 7.087 | 109.409 | 8.3 | 2021/05/10 | MPC · JPL |
| C/2016 R2 | PANSTARRS | 22000 | 0.9967 | 780 | 2.6020 | 58.2134 | 5.1 | 2018/05/09 | MPC · JPL |
| C/2016 T1 | Matheny | 1415.98 | 0.9818 | 126.10 | 2.3000 | 126.095 | 12.1 | 2017/02/01 | MPC · JPL |
| C/2016 T2 | Matheny | 1026.30 | 0.98125 | 101.74 | 1.9078 | 81.311 | 13.8 | 2016/12/29 | MPC · JPL |
| C/2016 T3 | PANSTARRS | 1730 | 0.9816 | 144 | 2.6496 | 22.6727 | 8.1 | 2017/09/06 | MPC · JPL |
| C/2016 VZ18 | PANSTARRS | 2700 | 0.99531 | 194.0 | 0.910285 | 24.0354 | 18.7 | 2017/03/07 | MPC · JPL |
| C/2017 AB5 | PANSTARRS | 37295204.74 | 0.99992 | 111625.443 | 9.2164 | 32.431 | 11.2 | 2018/02/17 | MPC · JPL |
| C/2017 D2 | Barros | 51000 | 0.9982 | 1369.820 | 2.48587 | 31.26579 | 11.1 | 2017/07/14 | MPC · JPL |
| C/2017 D5 | PANSTARRS | 1200 | 0.9806 | 112.2883 | 2.1672 | 131.03858 | 14.6 | 2017/01/08 | MPC · JPL |
| C/2017 E4 | Lovejoy | 10000 | 0.9989 | 477.669 | 0.49357 | 88.1867 | 15.6 | 2017/04/23 | MPC · JPL |
| C/2017 E5 | Lemmon | 7600 | 0.9954 | 388.6996 | 1.7829 | 122.6377 | 12.0 | 2016/06/10 | MPC · JPL |
| C/2017 G3 | PANSTARRS | 4900 | 0.99098 | 287.3256 | 2.59048 | 159.051 | 14.2 | 2017/04/15 | MPC · JPL |
| C/2017 K6 | Jacques | 34000 | 0.99810 | 1054.174 | 2.00279 | 57.2511 | 10.7 | 2018/01/03 | MPC · JPL |
| C/2017 M3 | PANSTARRS | 2292 | 0.9732 | 173.8170 | 4.6561 | 77.5073 | 6.2 | 2017/04/28 | MPC · JPL |
| C/2017 O1 | ASASSN | 9200 | 0.99658 | 439.1911 | 1.4987 | 39.849 | 10.4 | 2017/10/14 | MPC · JPL |
| C/2017 P2 | PANSTARRS | 42100 | 0.997967 | 1210 | 2.461777 | 50.08486 | 9.2 | 2017/12/06 | MPC · JPL |
| C/2017 T2 | PANSTARRS | 354300 | 0.99968 | 5007 | 1.6151 | 57.231 | 10.2 | 2020/05/05 | MPC · JPL |
| C/2017 T3 | ATLAS | 49280 | 0.99939 | 1344 | 0.82522 | 88.10362 | 11.1 | 2018/07/19 | MPC · JPL |
| C/2017 U2 | Fuls | too uncertain to determine | 0.99921 | 8555.39 | 6.700 | 95.4291 | 8.8 | 2017/08/28 | MPC · JPL |
| C/2017 Y1 | PANSTARRS | 234400 | 0.99902 | 3791 | 3.719 | 55.2287 | 9.3 | 2017/08/31 | MPC · JPL |
| C/2017 Y2 | PANSTARRS | too uncertain to determine | 0.99841 | 2502.89 | 3.957 | 124.67 | 8.0 | 2020/08/19 | MPC · JPL |
| C/2018 A3 | ATLAS | 10773 | 0.99328 | 487.788 | 3.277 | 139.56 | 9.2 | 2019/01/12 | MPC · JPL |
| C/2018 E2 | Barros | 74439 | 0.99778 | 1769.556 | 3.92 | 97.7428 | 6.4 | 2017/12/23 | MPC · JPL |
| C/2018 EF9 | Lemmon | 16221.08 | 0.99757 | 640.788 | 1.55663 | 84.694 | 18.2 | 2018/05/23 | MPC · JPL |
| C/2018 F1 | Grauer | 5789.36 | 0.9907 | 322.415 | 2.993 | 46.0706 | 13.7 | 2018/12/14 | MPC · JPL |
| C/2018 KJ3 | Lemmon | 24084.39 | 0.99565 | 833.97 | 3.627 | 136.66655 | 12.2 | 2019/09/10 | MPC · JPL |
| C/2018 L2 | ATLAS | 3879 | 0.9931 | 246.853 | 1.712 | 67.4235 | 8.1 | 2018/12/02 | MPC · JPL |
| C/2018 N1 | NEOWISE | too uncertain to determine | 0.9981 | 693.83 | 1.307 | 159.44 | 15.0 | 2018/08/01 | MPC · JPL |
| C/2018 R3 | Lemmon | 87446.17 | 0.99934 | 1970.10 | 1.29 | 69.7154 | 11.3 | 2019/06/07 | MPC · JPL |
| C/2018 R4 | Fuls | 5494 | 0.99451 | 311.353 | 1.7093 | 11.68371 | 11.8 | 2018/03/03 | MPC · JPL |
| C/2018 V4 | Africano | 3131.89 | 0.98506 | 214.059 | 3.19901 | 69.0028 | 15.7 | 2019/03/01 | MPC · JPL |
| C/2018 X2 | Fitzsimmons | 1947.93 | 0.9864 | 155.971 | 2.125 | 23.06 | 6.4 | 2019/07/08 | MPC · JPL |
| C/2018 Y1 | Iwamoto | 1149.57 | 0.988 | 109.736 | 1.287 | 160.4 | 12.3 | 2019/02/07 | MPC · JPL |
| C/2019 B1 | Africano | 1873.55 | 0.9895 | 151.97 | 1.597 | 123.36 | 14.6 | 2019/03/19 | MPC · JPL |
| C/2019 D1 | Flewelling | 1615.12 | 0.989 | 137.6571 | 1.5775 | 34.098 | 11.8 | 2019/05/11 | MPC · JPL |
| C/2019 H1 | NEOWISE | 3506.07 | 0.99201 | 230.7855 | 1.8448 | 104.579 | 13.5 | 2019/04/27 | MPC · JPL |
| C/2019 J2 | Palomar | too uncertain to determine | 0.99717 | 610.07 | 1.7269 | 105.138 | 11.6 | 2019/07/19 | MPC · JPL |
| C/2019 JU6 | ATLAS | too uncertain to determine | 0.99424 | 355.31 | 2.045 | 148.2972 | 15.1 | 2019/05/31 | MPC · JPL |
| C/2019 K4 | Ye | 115449.93 | 0.9990 | 2370.96 | 2.2594 | 105.31 | 12.8 | 2019/06/16 | MPC · JPL |
| C/2019 K5 | Young | 1855.41 | 0.9865 | 150.99 | 2.035 | 15.315 | 12.3 | 2019/06/22 | MPC · JPL |
| C/2019 K8 | ATLAS | too uncertain to determine | 0.998 | 1440.4914 | 3.195 | 93.222 | 11.3 | 2019/07/21 | MPC · JPL |
| C/2019 N1 | ATLAS | too uncertain to determine | 0.99987 | 13156.57 | 1.7047 | 82.424 | 9.0 | 2020/12/01 | MPC · JPL |
| C/2019 T3 | ATLAS | too uncertain to determine | 0.99948 | 11484.78 | 5.9468 | 121.86 | 6.6 | 2021/03/02 | MPC · JPL |
| C/2019 T4 | ATLAS | 31983.74 | 0.9958 | 1007.58 | 4.245 | 53.62 | 5.6 | 2022/06/09 | MPC · JPL |
| C/2019 U6 | Lemmon | 9084.03 | 0.9979 | 435.36 | 0.914 | 61.0049 | 13.3 | 2020/06/18 | MPC · JPL |
| C/2019 V1 | Borisov | too uncertain to determine | 0.99898 | 3033.17 | 3.0968 | 61.8636 | 14.5 | 2020/07/16 | MPC · JPL |
| C/2019 Y1 | ATLAS | 3513.22 | 0.9964 | 231.099 | 0.8378 | 73.347 | 12.4 | 2020/03/15 | MPC · JPL |
| C/2019 Y4 | ATLAS | 6025.89 | 0.9992 | 331.14 | 0.253 | 45.380 | 7.9 | 2020/05/31 | MPC · JPL |
| C/2019 Y4-B | ATLAS | 17185 | 0.99962 | 665.948 | 0.2525 | 45.454 | 15.8 | 2020/05/31 | MPC · JPL |
| C/2020 A2 | Iwamoto | 35002.27 | 0.9991 | 1070.02 | 0.978 | 120.75 | 15.0 | 2020/01/08 | MPC · JPL |
| C/2020 A3 | ATLAS | too uncertain to determine | 0.9991 | 6807.33 | 5.767 | 146.7 | 7.7 | 2019/06/29 | MPC · JPL |
| C/2020 B3 | Rankin | 84101.96 | 0.99826 | 1919.5 | 3.3446 | 20.703 | 14.5 | 2019/10/19 | MPC · JPL |
| C/2020 F3 | NEOWISE | 7329.46 | 0.9992 | 377.32 | 0.295 | 128.937 | 12.3 | 2020/07/03 | MPC · JPL |
| C/2020 F6 | PANSTARRS | 8159.58 | 0.99134 | 405.3 | 3.511 | 174.58 | 13.2 | 2020/04/11 | MPC · JPL |
| C/2020 F8 | SWAN | too uncertain to determine | 0.99994 | 6642.61 | 0.430 | 110.80 | 11.6 | 2020/05/27 | MPC · JPL |
| C/2020 H2 | Pruyne | 2487.72 | 0.9955 | 183.596 | 0.834 | 125.04 | 19.8 | 2020/04/27 | MPC · JPL |
| C/2020 H4 | Leonard | 1665.00 | 0.9933 | 140.477 | 0.9383 | 84.320 | 16.5 | 2020/08/29 | MPC · JPL |
| C/2020 H5 | Robinson | too uncertain to determine | 0.9963 | 2497.44 | 9.3500 | 70.204 | 4.5 | 2020/12/05 | MPC · JPL |
| C/2020 H7 | Lemmon | 56742.20 | 0.997 | 1476.6 | 4.42 | 135.92 | 11.1 | 2020/06/02 | MPC · JPL |
| C/2020 H8 | PANSTARRS | 14510 | 0.99214 | 594.908 | 4.6744 | 99.65 | 10.4 | 2020/06/04 | MPC · JPL |
| C/2020 H11 | PANSTARRS Lemmon | 1070000 | 0.99927 | 10470 | 7.631 | 151.41 | 7.4 | 2020/09/15 | MPC · JPL |
| C/2020 J1 | SONEAR | too uncertain to determine | 0.9996 | 9376.42 | 3.356 | 142.305 | 7.2 | 2021/04/18 | MPC · JPL |
| C/2020 K1 | PANSTARRS | too uncertain to determine | 0.99902 | 3141.03 | 3.078 | 89.646 | 5.6 | 2023/05/09 | MPC · JPL |
| C/2020 K2 | PANSTARRS | too uncertain to determine | 0.99894 | 8380.85 | 8.8762 | 91.0288 | 6.1 | 2020/08/05 | MPC · JPL |
| C/2020 K3 | Leonard | 3053.03 | 0.9924 | 210.450 | 1.593 | 128.72 | 14.8 | 2020/05/30 | MPC · JPL |
| C/2020 K6 | Rankin | too uncertain to determine | 0.998 | 2876.55 | 5.8844 | 103.619 | 8.1 | 2021/09/11 | MPC · JPL |
| C/2020 K7 | PANSTARRS | 1128.70 | 0.9411 | 108.4 | 6.3847 | 32.059 | 7.9 | 2019/10/30 | MPC · JPL |
| C/2020 M5 | ATLAS | 346814.64 | 0.9994 | 4936.2 | 3.005 | 93.223 | 6.9 | 2021/08/19 | MPC · JPL |
| C/2020 N2 | ATLAS | 1134.00 | 0.9835 | 108.74 | 1.746 | 161.034 | 15.6 | 2020/08/23 | MPC · JPL |
| C/2020 P3 | ATLAS | too uncertain to determine | 0.9986 | 4910.32 | 6.812 | 61.89 | 6.7 | 2021/04/20 | MPC · JPL |
| C/2020 R2 | ATLAS | 7950.15 | 0.9882 | 398.332 | 4.693 | 53.22 | 7.1 | 2022/02/24 | MPC · JPL |
| C/2020 R6 | Rankin | too uncertain to determine | 0.9931 | 451.023 | 3.129 | 82.83 | 7.4 | 2019/09/10 | MPC · JPL |
| C/2020 R7 | ATLAS | too uncertain to determine | 0.99953 | 6397.95 | 2.957 | 114.893 | 10.7 | 2022/09/16 | MPC · JPL |
| C/2020 S3 | Erasmus | 2577.50 | 0.99788 | 187.987 | 0.3985 | 19.861 | 13.0 | 2020/12/12 | MPC · JPL |
| C/2020 S4 | PANSTARRS | too uncertain to determine | 0.99932 | 4962.260 | 3.3673 | 20.5750 | 7.4 | 2023/02/09 | MPC · JPL |
| C/2020 S8 | PANSTARRS | 4468.01 | 0.99129 | 271.2715 | 2.3639 | 108.517 | 8.1 | 2021/04/10 | MPC · JPL |
| C/2020 T2 | Palomar | 5814.24 | 0.99364 | 323.34 | 2.055 | 27.873 | 8.8 | 2021/07/11 | MPC · JPL |
| C/2020 T5 | Lemmon | 28398.06 | 0.99797 | 930.79 | 1.889 | 66.604 | 16.2 | 2020/10/09 | MPC · JPL |
| C/2020 U5 | Lemmon | too uncertain to determine | 0.99995 | 79736.84 | 3.756 | 97.280 | 9.7 | 2022/04/27 | MPC · JPL |
| C/2020 Y2 | ATLAS | 42502.95 | 0.99743 | 1217.888 | 3.132 | 101.281 | 6.4 | 2022/06/17 | MPC · JPL |
| C/2020 Y3 | ATLAS | 1858.91 | 0.98678 | 151.18 | 1.999 | 83.097 | 14.6 | 2020/12/03 | MPC · JPL |
| C/2021 A2 | NEOWISE | 4126.29 | 0.9945 | 257.26 | 1.413 | 106.978 | 14.7 | 2021/01/22 | MPC · JPL |
| C/2021 A6 | PANSTARRS | too uncertain to determine | 0.99933 | 11846.50 | 7.929 | 75.605 | 7.1 | 2021/05/05 | MPC · JPL |
| C/2021 A7 | NEOWISE | too uncertain to determine | 0.99964 | 5448.01 | 1.968 | 78.149 | 13.5 | 2021/07/15 | MPC · JPL |
| C/2021 B2 | PANSTARRS | 6159.5 | 0.99252 | 336.015 | 2.513 | 38.094 | 4.8 | 2021/07/15 | MPC · JPL |
| C/2021 C1 | Rankin | too uncertain to determine | 0.99957 | 8030.77 | 3.481 | 143.04 | 8.8 | 2020/12/07 | MPC · JPL |
| C/2021 C4 | ATLAS | too uncertain to determine | 0.99903 | 4645.31 | 4.504 | 132.84 | 6.9 | 2021/01/17 | MPC · JPL |
| C/2021 C5 | ATLAS | too uncertain to determine | 0.99977 | 14042.0 | 3.241 | 50.787 | 12.0 | 2023/02/10 | MPC · JPL |
| C/2021 G2 | ATLAS | too uncertain to determine | 0.99876 | 4011.4 | 4.976 | 48.478 | 5.7 | 2024/09/10 | MPC · JPL |
| C/2021 N3 | PANSTARRS | 1990.4 | 0.9640 | 158.23 | 5.701 | 26.74 | 7.1 | 2020/08/17 | MPC · JPL |
| C/2021 P2 | PANSTARRS | too uncertain to determine | 0.9977 | 2211.11 | 5.072 | 150.02 | 5.4 | 2023/01/21 | MPC · JPL |
| C/2021 P4 | ATLAS | 5338.32 | 0.9965 | 305.44 | 1.080 | 56.31 | 8.7 | 2022/07/30 | MPC · JPL |
| C/2021 Q6 | PANSTARRS | too uncertain to determine | 0.9992 | 10932 | 8.716 | 161.85 | 6.9 | 2024/03/21 | MPC · JPL |
| C/2021 R2 | PANSTARRS | too uncertain to determine | 0.9968 | 2265.45 | 7.312 | 134.46 | 7.7 | 2021/12/25 | MPC · JPL |
| C/2021 R7 | PANSTARRS | too uncertain to determine | 0.9943 | 989.93 | 5.640 | 158.85 | 7.5 | 2021/04/14 | MPC · JPL |
| C/2021 S3 | PANSTARRS | too uncertain to determine | 0.9996 | 3317.47 | 1.318 | 58.55 | 6.8 | 2024/02/14 | MPC · JPL |
| C/2021 S4 | Tsuchinshan (*CTC) | 2035.2 | 0.9583 | 161.91 | 6.694 | 17.478 | 7.0 | 2023/12/31 | MPC · JPL |
| C/2021 T1 | Lemmon | 56007.2 | 0.9979 | 1463.83 | 3.058 | 140.35 | 5.7 | 2021/10/14 | MPC · JPL |
| C/2021 T4 | Lemmon | 8970000 | 0.9999 | 43170 | 1.482 | 160.757 | 6.9 | 2023/07/31 | MPC · JPL |
| C/2021 U5 | Catalina | 3193.50 | 0.9891 | 216.86 | 2.363 | 39.05 | 6.9 | 2022/01/26 | MPC · JPL |
| C/2021 V1 | Rankin | 17709.00 | 0.9956 | 679.40 | 3.014 | 71.441 | 15.9 | 2022/04/30 | MPC · JPL |
| C/2022 A1 | Sarneczky | 8347 | 0.9970 | 411.49 | 1.253 | 116.51 | 19.2 | 2022/01/31 | MPC · JPL |
| C/2022 A3 | Lemmon - ATLAS | 31921.61 | 0.9963 | 1006.28 | 3.703 | 88.360 | 5.3 | 2023/09/28 | MPC · JPL |
| C/2022 B4 | too uncertain to determine | 0.9964 | 382.80 | 1.380 | 20.043 | 21.7 | 2022/01/29 | MPC · JPL | |
| C/2022 D2 | Kowalski | 6720 | 0.9956 | 356.11 | 1.555 | 22.655 | 14.1 | 2022/03/27 | MPC · JPL |
| C/2022 H1 | Kowalski | too uncertain to determine | 0.9934 | 1158.59 | 7.693 | 49.870 | 6.3 | 2024/01/18 | MPC · JPL |
| C/2022 L1 | Catalina | 12150 | 0.9970 | 528.47 | 1.591 | 123.468 | 13.3 | 2022/09/28 | MPC · JPL |
| C/2022 L4 | PANSTARRS | too uncertain to determine | 0.9881 | 254.18 | 3.015 | 141.224 | 16.6 | 2021/12/08 | MPC · JPL |
| C/2022 P3 | ZTF | 3808 | 0.9894 | 243.88 | 2.561 | 59.519 | 14.5 | 2022/07/27 | MPC · JPL |
| C/2022 R2 | ATLAS | 8697 | 0.9985 | 422.92 | 0.633 | 52.895 | 16.6 | 2022/10/25 | MPC · JPL |
| C/2022 T1 | Lemmon | 318000 | 0.9993 | 4655 | 3.444 | 22.543 | 5.1 | 2024/02/17 | MPC · JPL |
| C/2022 U1 | Leonard | too uncertain to determine | 0.9992 | 5401 | 4.203 | 128.126 | 6.7 | 2025/03/25 | MPC · JPL |
| C/2022 U4 | Bok | 227000 | 0.9992 | 3727 | 2.898 | 52.038 | 9.7 | 2023/08/03 | MPC · JPL |
| C/2022 W2 | ATLAS | 6050 | 0.9906 | 332.03 | 3.123 | 63.533 | 14.1 | 2023/03/08 | MPC · JPL |
| C/2022 W3 | Leonard | 4707 | 0.9950 | 280.85 | 1.398 | 103.560 | 14.0 | 2023/06/22 | MPC · JPL |
| C/2023 A1 | Leonard | 3470 | 0.9920 | 229.28 | 1.835 | 94.743 | 6.2 | 2023/03/18 | MPC · JPL |
| C/2023 A2 | SWAN | 13060 | 0.9983 | 554.6 | 0.947 | 94.708 | 12.5 | 2023/01/20 | MPC · JPL |
| C/2023 B2 | ATLAS | 14920 | 0.9971 | 606.07 | 1.743 | 40.771 | 5.8 | 2023/03/10 | MPC · JPL |
| C/2023 C2 | ATLAS | too uncertain to determine | 0.9994 | 4022 | 2.368 | 48.318 | 7.3 | 2024/11/16 | MPC · JPL |
| C/2023 F1 | PanSTARRS | 4290 | 0.9935 | 2264.0 | 1.708 | 131.752 | 10.1 | 2023/06/08 | MPC · JPL |
| C/2023 H1 | PanSTARRS | too uncertain to determine | 0.9974 | 1719 | 4.44 | 21.777 | 8.7 | 2024/11/28 | MPC · JPL |
| C/2023 H2 | Lemmon | 3734 | 0.9963 | 240.7 | 0.894 | 113.75 | 10.0 | 2023/10/29 | MPC · JPL |
| C/2023 K1 | ATLAS | 17000 | 0.9969 | 662 | 2.093 | 138.00 | 6.9 | 2023/09/07 | MPC · JPL |
| C/2023 Q2 | PanSTARRS | 6155 | 0.9904 | 335.9 | 3.209 | 104.05 | 10.8 | 2024/06/24 | MPC · JPL |
| C/2023 S2 | ATLAS | 1835 | 0.9929 | 149.89 | 1.068 | 20.485 | 14.5 | 2023/10/15 | MPC · JPL |
| C/2023 T2 | Borisov | 3543 | 0.9914 | 232.42 | 1.995 | 48.597 | 11.3 | 2023/12/22 | MPC · JPL |
| C/2023 T3 | Fuls | 16692 | 0.9946 | 653.15 | 3.549 | 27.222 | 6.7 | 2025/01/25 | MPC · JPL |
| C/2023 U1 | Fuls | too uncertain to determine | 0.9967 | 1502.5 | 4.974 | 108.145 | 8.0 | 2024/10/12 | MPC · JPL |
| C/2023 V1 | Lemmon | too uncertain to determine | 0.99925 | 6822.73 | 5.094 | 102.01 | 7.4 | 2025/07/13 | MPC · JPL |
| Comet designation | Name/ discoverer(s) | Period (years) | e | a (AU) | q (AU) | i (°) | Abs. mag (M1) | Perihelion date | Ref |
A comet is an icy, small Solar System body that warms and begins to release gases when passing close to the Sun, a process called outgassing. This produces an extended, gravitationally unbound atmosphere or coma surrounding the nucleus, and sometimes a tail of gas and dust gas blown out from the coma. These phenomena are due to the effects of solar radiation and the outstreaming solar wind plasma acting upon the nucleus of the comet. Comet nuclei range from a few hundred meters to tens of kilometers across and are composed of loose collections of ice, dust, and small rocky particles. The coma may be up to 15 times Earth's diameter, while the tail may stretch beyond one astronomical unit. If sufficiently close and bright, a comet may be seen from Earth without the aid of a telescope and can subtend an arc of up to 30° across the sky. Comets have been observed and recorded since ancient times by many cultures and religions.
The Kuiper belt is a circumstellar disc in the outer Solar System, extending from the orbit of Neptune at 30 astronomical units (AU) to approximately 50 AU from the Sun. It is similar to the asteroid belt, but is far larger—20 times as wide and 20–200 times as massive. Like the asteroid belt, it consists mainly of small bodies or remnants from when the Solar System formed. While many asteroids are composed primarily of rock and metal, most Kuiper belt objects are composed largely of frozen volatiles, such as methane, ammonia, and water. The Kuiper belt is home to most of the objects that astronomers generally accept as dwarf planets: Orcus, Pluto, Haumea, Quaoar, and Makemake. Some of the Solar System's moons, such as Neptune's Triton and Saturn's Phoebe, may have originated in the region.
The Oort cloud, sometimes called the Öpik–Oort cloud, is theorized to be a vast cloud of icy planetesimals surrounding the Sun at distances ranging from 2,000 to 200,000 AU. The concept of such a cloud was proposed in 1950 by the Dutch astronomer Jan Oort, in whose honor the idea was named. Oort proposed that the bodies in this cloud replenish and keep constant the number of long-period comets entering the inner Solar System—where they are eventually consumed and destroyed during close approaches to the Sun.
In astrodynamics, the orbital eccentricity of an astronomical object is a dimensionless parameter that determines the amount by which its orbit around another body deviates from a perfect circle. A value of 0 is a circular orbit, values between 0 and 1 form an elliptic orbit, 1 is a parabolic escape orbit, and greater than 1 is a hyperbola. The term derives its name from the parameters of conic sections, as every Kepler orbit is a conic section. It is normally used for the isolated two-body problem, but extensions exist for objects following a rosette orbit through the Galaxy.
JPL Horizons On-Line Ephemeris System provides access to key Solar System data and flexible production of highly accurate ephemerides for Solar System objects.
The scattered disc (or scattered disk) is a distant circumstellar disc in the Solar System that is sparsely populated by icy small Solar System bodies, which are a subset of the broader family of trans-Neptunian objects. The scattered-disc objects (SDOs) have orbital eccentricities ranging as high as 0.8, inclinations as high as 40°, and perihelia greater than 30 astronomical units (4.5×109 km; 2.8×109 mi). These extreme orbits are thought to be the result of gravitational "scattering" by the gas giants, and the objects continue to be subject to perturbation by the planet Neptune.
Comet C/2006 M4 (SWAN) is a non-periodic comet discovered in late June 2006 by Robert D. Matson of Irvine, California and Michael Mattiazzo of Adelaide, South Australia in publicly available images of the Solar and Heliospheric Observatory (SOHO). These images were captured by the Solar Wind ANisotropies (SWAN) Lyman-alpha all-sky camera on board the SOHO. The comet was officially announced after a ground-based confirmation by Robert McNaught on July 12.
This glossary of astronomy is a list of definitions of terms and concepts relevant to astronomy and cosmology, their sub-disciplines, and related fields. Astronomy is concerned with the study of celestial objects and phenomena that originate outside the atmosphere of Earth. The field of astronomy features an extensive vocabulary and a significant amount of jargon.
2012 DR30 is a trans-Neptunian object and centaur from the scattered disk and/or inner Oort cloud, located in the outermost region of the Solar System. The object with a highly eccentric orbit of 0.99 was first observed by astronomers with the Spacewatch program at Steward Observatory on 31 March 2009. It measures approximately 188 kilometers (120 miles) in diameter.
2013 BL76 is a trans-Neptunian object and centaur from the scattered disk and Inner Oort cloud approximately 30 kilometers in diameter.
In observational astronomy, the observation arc of a Solar System body is the time period between its earliest and latest observations, used for tracing the body's path. It is usually given in days or years. The term is mostly used in the discovery and tracking of asteroids and comets. Arc length has the greatest influence on the accuracy of an orbit. The number, spacing of intermediate observations, and timestamps have a lesser effect.
C/2015 ER61 (PanSTARRS) is a comet and inner Oort cloud object. When classified as a minor planet, it had the fourth-largest aphelion of any known minor planet in the Solar System, after 2005 VX3, 2012 DR30, and 2013 BL76. It additionally had the most eccentric orbit of any known minor planet, with its distance from the Sun varying by about 99.9% during the course of its orbit, followed by 2005 VX3 with an eccentricity of 0.9973. On 30 January 2016, it was classified as a comet when it was 5.7 AU from the Sun. It comes close to Jupiter, and a close approach in the past threw it on the distant orbit it is on now.
C/2017 U7 (PanSTARRS) is a hyperbolic comet, first observed on 29 October 2017 by astronomers of the Pan-STARRS facility at Haleakala Observatory, Hawaii, United States when the object was 7.8 AU (1.2 billion km) from the Sun. Despite being discovered only 10 days after interstellar asteroid 1I/'Oumuamua, it was not announced until March 2018 as its orbit is not strongly hyperbolic beyond most Oort Cloud comets. Based on the absolute magnitude of 10.6, it may measure tens of kilometers in diameter. As of August 2018, there is only 1 hyperbolic asteroid known, ʻOumuamua, but hundreds of hyperbolic comets are known.
In planetary science, the term unusual minor planet, or unusual object, is used for a minor planet that possesses an unusual physical or orbital characteristic. For the Minor Planet Center (MPC), which operates under the auspices of the International Astronomical Union, any non-classical main-belt asteroid, which account for the vast majority of all minor planets, is an unusual minor planet. These include the near-Earth objects and Trojans as well as the distant minor planets such as centaurs and trans-Neptunian objects. In a narrower sense, the term is used for a group of bodies – including main-belt asteroids, Mars-crossers, centaurs and otherwise non-classifiable minor planets – that show a high orbital eccentricity, typically above 0.5 and/or a perihelion of less than 6 AU. Similarly, an unusual asteroid (UA) is an inner Solar System object with a high eccentricity and/or inclination but with a perihelion larger than 1.3 AU, which does exclude the near-Earth objects.
C/2021 O3 (PanSTARRS) is perhaps an Oort cloud comet, discovered on 26 July 2021 by the Pan-STARRS sky survey. It came to perihelion on 21 April 2022 at 0.287 AU (42.9 million km). from the Sun.
