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Solar eclipse of November 22, 1984

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Solar eclipse of November 22, 1984
Map
Type of eclipse
NatureTotal
Gamma−0.3132
Magnitude1.0237
Maximum eclipse
Duration120 s (2 min 0 s)
Coordinates37°48′S 173°36′W / 37.8°S 173.6°W / -37.8; -173.6
Max. width of band85 km (53 mi)
Times (UTC)
Greatest eclipse22:54:17
References
Saros142 (21 of 72)
Catalog # (SE5000)9475

A total solar eclipse occurred at the Moon's descending node of orbit between Thursday, November 22 and Friday, November 23, 1984,[1] with a magnitude of 1.0237. 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. A total solar eclipse occurs when the Moon's apparent diameter is larger than the Sun's, blocking all direct sunlight, turning day into darkness. Totality occurs in a narrow path across Earth's surface, with the partial solar eclipse visible over a surrounding region thousands of kilometres wide. Occurring about 2.1 days after perigee (on November 20, 1984, at 20:50 UTC), the Moon's apparent diameter was larger.[2]

Totality was visible in Indonesia, Papua New Guinea and southern Pacific Ocean. West of the International Date Line the eclipse took place on November 23, including all land in the path of totality. A partial eclipse was visible for parts of Indonesia, Australia, Oceania, Antarctica, and extreme southern South America.

Observations

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Jay Pasachoff led an observation team from Williams College in Massachusetts to Papua New Guinea, taking images of the process of the eclipse and the corona, as well as the Baily's beads and the illuminance of the corona. Besides the observations, the team members also went to places near the Sepik River in northern Papua New Guinea.[3]

Eclipse details

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Shown below are two tables displaying details about this particular solar eclipse. The first table outlines times at which the moon's penumbra or umbra attains the specific parameter, and the second table describes various other parameters pertaining to this eclipse.[4]

November 22, 1984 Solar Eclipse Times
Event Time (UTC)
First Penumbral External Contact 1984 November 22 at 20:14:19.4 UTC
First Umbral External Contact 1984 November 22 at 21:13:34.5 UTC
First Central Line 1984 November 22 at 21:13:48.2 UTC
First Umbral Internal Contact 1984 November 22 at 21:14:01.9 UTC
First Penumbral Internal Contact 1984 November 22 at 22:19:19.9 UTC
Greatest Eclipse 1984 November 22 at 22:54:16.8 UTC
Greatest Duration 1984 November 22 at 22:55:25.9 UTC
Ecliptic Conjunction 1984 November 22 at 22:57:34.7 UTC
Equatorial Conjunction 1984 November 22 at 23:04:48.0 UTC
Last Penumbral Internal Contact 1984 November 22 at 23:28:57.9 UTC
Last Umbral Internal Contact 1984 November 23 at 00:34:27.7 UTC
Last Central Line 1984 November 23 at 00:34:39.2 UTC
Last Umbral External Contact 1984 November 23 at 00:34:50.7 UTC
Last Penumbral External Contact 1984 November 23 at 01:34:14.6 UTC
November 22, 1984 Solar Eclipse Parameters
Parameter Value
Eclipse Magnitude 1.02368
Eclipse Obscuration 1.04792
Gamma −0.31318
Sun Right Ascension 15h54m44.1s
Sun Declination -20°19'37.3"
Sun Semi-Diameter 16'11.9"
Sun Equatorial Horizontal Parallax 08.9"
Moon Right Ascension 15h54m19.9s
Moon Declination -20°37'27.2"
Moon Semi-Diameter 16'19.2"
Moon Equatorial Horizontal Parallax 0°59'53.7"
ΔT 54.3 s

Eclipse season

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This eclipse is part of an eclipse season, a period, roughly every six months, when eclipses occur. Only two (or occasionally three) eclipse seasons occur each year, and each season lasts about 35 days and repeats just short of six months (173 days) later; thus two full eclipse seasons always occur each year. Either two or three eclipses happen each eclipse season. In the sequence below, each eclipse is separated by a fortnight.

Eclipse season of November 1984
November 8
Ascending node (full moon)
November 22
Descending node (new moon)
Penumbral lunar eclipse
Lunar Saros 116
Annular solar eclipse
Solar Saros 142
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Eclipses in 1984

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Metonic

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Tzolkinex

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Half-Saros

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Tritos

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Solar Saros 142

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Inex

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Triad

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Solar eclipses of 1982–1985

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This eclipse is a member of a semester series. An eclipse in a semester series of solar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternating nodes of the Moon's orbit.[5]

The partial solar eclipses on January 25, 1982 and July 20, 1982 occur in the previous lunar year eclipse set.

Solar eclipse series sets from 1982 to 1985
Ascending node   Descending node
Saros Map Gamma Saros Map Gamma
117 June 21, 1982

Partial
−1.2102 122 December 15, 1982

Partial
1.1293
127 June 11, 1983

Total
−0.4947 132 December 4, 1983

Annular
0.4015
137 May 30, 1984

Annular
0.2755 142

Partial in Gisborne,
New Zealand
November 22, 1984

Total
−0.3132
147 May 19, 1985

Partial
1.072 152 November 12, 1985

Total
−0.9795

Saros 142

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This eclipse is a part of Saros series 142, repeating every 18 years, 11 days, and containing 72 events. The series started with a partial solar eclipse on April 17, 1624. It contains a hybrid eclipse on July 14, 1768, and total eclipses from July 25, 1786 through October 29, 2543. There are no annular eclipses in this set. The series ends at member 72 as a partial eclipse on June 5, 2904. Its eclipses are tabulated in three columns; every third eclipse in the same column is one exeligmos apart, so they all cast shadows over approximately the same parts of the Earth.

The longest duration of totality will be produced by member 38 at 6 minutes, 34 seconds on May 28, 2291. All eclipses in this series occur at the Moon’s descending node of orbit.[6]

Series members 11–32 occur between 1801 and 2200:
11 12 13

August 5, 1804

August 16, 1822

August 27, 1840
14 15 16

September 7, 1858

September 17, 1876

September 29, 1894
17 18 19

October 10, 1912

October 21, 1930

November 1, 1948
20 21 22

November 12, 1966

November 22, 1984

December 4, 2002
23 24 25

December 14, 2020

December 26, 2038

January 5, 2057
26 27 28

January 16, 2075

January 27, 2093

February 8, 2111
29 30 31

February 18, 2129

March 2, 2147

March 12, 2165
32

March 23, 2183

Metonic series

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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.

22 eclipse events between September 12, 1931 and July 1, 2011
September 11–12 June 30–July 1 April 17–19 February 4–5 November 22–23
114 116 118 120 122

September 12, 1931

June 30, 1935

April 19, 1939

February 4, 1943

November 23, 1946
124 126 128 130 132

September 12, 1950

June 30, 1954

April 19, 1958

February 5, 1962

November 23, 1965
134 136 138 140 142

September 11, 1969

June 30, 1973

April 18, 1977

February 4, 1981

November 22, 1984
144 146 148 150 152

September 11, 1988

June 30, 1992

April 17, 1996

February 5, 2000

November 23, 2003
154 156

September 11, 2007

July 1, 2011

Tritos series

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This eclipse is a part of a tritos cycle, repeating at alternating nodes every 135 synodic months (≈ 3986.63 days, or 11 years minus 1 month). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee), but groupings of 3 tritos cycles (≈ 33 years minus 3 months) come close (≈ 434.044 anomalistic months), so eclipses are similar in these groupings.

Series members between 1801 and 2200

April 4, 1810
(Saros 126)

March 4, 1821
(Saros 127)

February 1, 1832
(Saros 128)

December 31, 1842
(Saros 129)

November 30, 1853
(Saros 130)

October 30, 1864
(Saros 131)

September 29, 1875
(Saros 132)

August 29, 1886
(Saros 133)

July 29, 1897
(Saros 134)

June 28, 1908
(Saros 135)

May 29, 1919
(Saros 136)

April 28, 1930
(Saros 137)

March 27, 1941
(Saros 138)

February 25, 1952
(Saros 139)

January 25, 1963
(Saros 140)

December 24, 1973
(Saros 141)

November 22, 1984
(Saros 142)

October 24, 1995
(Saros 143)

September 22, 2006
(Saros 144)

August 21, 2017
(Saros 145)

July 22, 2028
(Saros 146)

June 21, 2039
(Saros 147)

May 20, 2050
(Saros 148)

April 20, 2061
(Saros 149)

March 19, 2072
(Saros 150)

February 16, 2083
(Saros 151)

January 16, 2094
(Saros 152)

December 17, 2104
(Saros 153)

November 16, 2115
(Saros 154)

October 16, 2126
(Saros 155)

September 15, 2137
(Saros 156)

August 14, 2148
(Saros 157)

July 15, 2159
(Saros 158)

June 14, 2170
(Saros 159)

May 13, 2181
(Saros 160)

April 12, 2192
(Saros 161)

Inex series

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This eclipse is a part of the long period inex cycle, repeating at alternating nodes, every 358 synodic months (≈ 10,571.95 days, or 29 years minus 20 days). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee). However, groupings of 3 inex cycles (≈ 87 years minus 2 months) comes close (≈ 1,151.02 anomalistic months), so eclipses are similar in these groupings.

Series members between 1801 and 2200

March 24, 1811
(Saros 136)

March 4, 1840
(Saros 137)

February 11, 1869
(Saros 138)

January 22, 1898
(Saros 139)

January 3, 1927
(Saros 140)

December 14, 1955
(Saros 141)

November 22, 1984
(Saros 142)

November 3, 2013
(Saros 143)

October 14, 2042
(Saros 144)

September 23, 2071
(Saros 145)

September 4, 2100
(Saros 146)

August 15, 2129
(Saros 147)

July 25, 2158
(Saros 148)

July 6, 2187
(Saros 149)

Notes

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  1. ^ "November 22–23, 1984 Total Solar Eclipse". timeanddate. Retrieved 9 August 2024.
  2. ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 9 August 2024.
  3. ^ "1984, Papua New Guinea". Williams College. Archived from the original on 27 September 2020.
  4. ^ "Total Solar Eclipse of 1984 Nov 22". EclipseWise.com. Retrieved 9 August 2024.
  5. ^ van Gent, R.H. "Solar- and Lunar-Eclipse Predictions from Antiquity to the Present". A Catalogue of Eclipse Cycles. Utrecht University. Retrieved 6 October 2018.
  6. ^ "NASA - Catalog of Solar Eclipses of Saros 142". eclipse.gsfc.nasa.gov.

References

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