Solar eclipse of September 23, 1987

Last updated
Solar eclipse of September 23, 1987
SE1987Sep23A.png
Map
Type of eclipse
NatureAnnular
Gamma 0.2787
Magnitude 0.9634
Maximum eclipse
Duration229 sec (3 m 49 s)
Coordinates 14°18′N138°24′E / 14.3°N 138.4°E / 14.3; 138.4
Max. width of band137 km (85 mi)
Times (UTC)
Greatest eclipse3:12:22
References
Saros 134 (42 of 71)
Catalog # (SE5000) 9481

An annular solar eclipse occurred on September 23, 1987. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth. An annular solar eclipse occurs when the Moon's apparent diameter is smaller than the Sun's, blocking most of the Sun's light and causing the Sun to look like an annulus (ring). An annular eclipse appears as a partial eclipse over a region of the Earth thousands of kilometres wide. Annularity was visible in the Soviet Union (today's Kazakhstan), China (including Shanghai), southwestern Mongolia, Okinawa Islands of Japan except Kume Island and the southwestern tip of Kerama Islands, the Federal States of Micronesia, Papua New Guinea, Solomon Islands, Rotuma Islands of Fiji, Wallis Islands and West Samoa (the name changed to Samoa later). Occurring only 5 days after apogee (Apogee on September 18, 1987), the Moon's apparent diameter was relatively small.

Contents

Observation

Five radio observation stations were present in China at the time of the eclipse, two of which were within the annularity, in Ürümqi and Shanghai respectively. A partial solar eclipse was observed from the other three, including one in Nanjing where the eclipse was close to annularity, and the rest two in Beijing and Kunming. The Department of Mathematics and Physics of the Chinese Academy of Sciences and the Chinese Astronomical Society held a meeting in Kunming in December 1986, deciding that on-site observation would be conducted at each station, among which the Shanghai Astronomical Observatory was considered to have the best location with a larger magnitude of the eclipse, longer duration and larger solar zenith angle. The Shanghai Astronomical Observatory conducted observations with seven different wave bands using a 25-metre radio telescope. [1] The Yunnan Astronomical Observatory located in Kunming also conducted a multi-band joint observation of the partial solar eclipse. [2]

The Chinese Research Institute of Radio Wave Propagation conducted observations with a high-frequency skywave radar located in Xinxiang on the southern limit of annularity. Uneven structure and motion were observed in the ionosphere, the highest operating frequency was found changed during the eclipse, and large-scale fluctuations continued after the eclipse. [3]

Eclipses of 1987

Solar eclipses of 1986–1989

There were 8 solar eclipses between April 9, 1986 and August 31, 1989.

Solar eclipse series sets from 1986–1989
Ascending node Descending node
SarosMapGammaSarosMapGamma
119 SE1986Apr09P.png
1986 April 9
Partial
-1.08215124 SE1986Oct03H.png
1986 October 3
Hybrid
0.99305
129 SE1987Mar29H.png
1987 March 29
Hybrid
-0.30531134 SE1987Sep23A.png
1987 September 23
Annular
0.27869
139 SE1988Mar18T.png
1988 March 18
Total
0.41879144 SE1988Sep11A.png
1988 September 11
Annular
-0.46811
149 SE1989Mar07P.png
1989 March 7
Partial
1.09815154 SE1989Aug31P.png
1989 August 31
Partial
-1.19279

Saros 134

It is a part of Saros cycle 134, repeating every 18 years, 11 days, containing 71 events. The series started with partial solar eclipse on June 22, 1248. It contains total eclipses from October 9, 1428 through December 24, 1554 and hybrid eclipses from January 3, 1573 through June 27, 1843, and annular eclipses from July 8, 1861 through May 21, 2384. The series ends at member 71 as a partial eclipse on August 6, 2510. The longest duration of totality was 1 minutes, 30 seconds on October 9, 1428. All eclipses in this series occurs at the Moon’s descending node. [4]

Series members 32–48 occur between 1801 and 2100:
323334
SE1807Jun06H.png
June 6, 1807
SE1825Jun16H.png
June 16, 1825
SE1843Jun27H.png
June 27, 1843
353637
SE1861Jul08A.png
July 8, 1861
SE1879Jul19A.png
July 19, 1879
SE1897Jul29A.png
July 29, 1897
383940
SE1915Aug10A.png
August 10, 1915
SE1933Aug21A.png
August 21, 1933
SE1951Sep01A.png
September 1, 1951
414243
SE1969Sep11A.png
September 11, 1969
SE1987Sep23A.png
September 23, 1987
SE2005Oct03A.png
October 3, 2005
444546
SE2023Oct14A.png
October 14, 2023
SE2041Oct25A.png
October 25, 2041
SE2059Nov05A.png
November 5, 2059
4748
SE2077Nov15A.png
November 15, 2077
SE2095Nov27A.png
November 27, 2095

Metonic series

The metonic series repeats eclipses every 19 years (6939.69 days), lasting about 5 cycles. Eclipses occur in nearly the same calendar date. In addition, the octon subseries repeats 1/5 of that or every 3.8 years (1387.94 days). All eclipses in this table occur at the Moon's descending node.

21 eclipse events, progressing from north to south between July 11, 1953 and July 11, 2029
July 10–12April 29–30February 15–16December 4–5September 21–23
116118120122124
SE1953Jul11P.png
July 11, 1953
SE1957Apr30A.png
April 30, 1957
SE1961Feb15T.png
February 15, 1961
SE1964Dec04P.png
December 4, 1964
SE1968Sep22T.png
September 22, 1968
126128130132134
SE1972Jul10T.png
July 10, 1972
SE1976Apr29A.png
April 29, 1976
SE1980Feb16T.png
February 16, 1980
SE1983Dec04A.png
December 4, 1983
SE1987Sep23A.png
September 23, 1987
136138140142144
SE1991Jul11T.png
July 11, 1991
SE1995Apr29A.png
April 29, 1995
SE1999Feb16A.png
February 16, 1999
SE2002Dec04T.png
December 4, 2002
SE2006Sep22A.png
September 22, 2006
146148150152154
SE2010Jul11T.png
July 11, 2010
SE2014Apr29A.png
April 29, 2014
SE2018Feb15P.png
February 15, 2018
SE2021Dec04T.png
December 4, 2021
SE2025Sep21P.png
September 21, 2025
156158160162164
SE2029Jul11P.png
July 11, 2029

Notes

  1. 纪树臣 季德盛 梁世光 (1988). "1987年9月23日沪台25米天线观测选题及方案". 云南天文台台刊 (04): 100–105.
  2. 纪树臣 杨荣邦 谢瑞祥 (1989). "1987年9月23日日偏食云台多波段联合观测". 云南天文台台刊 (03): 46–53.
  3. 焦培南 (1990). "1987年9月23日日环食的电离层波动现象". 地球物理学报. 33 (04): 391–398. Archived from the original on 21 July 2015.
  4. "NASA - Catalog of Solar Eclipses of Saros 134". eclipse.gsfc.nasa.gov.

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References