October 1987 lunar eclipse
| Penumbral eclipse | |||||||||
 The Moon's hourly motion shown right to left | |||||||||
| Date | October 7, 1987 | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Gamma | 1.0189 | ||||||||
| Magnitude | −0.0095 | ||||||||
| Saros cycle | 146 (9 of 72) | ||||||||
| Penumbral | 253 minutes, 28 seconds | ||||||||
| |||||||||
A penumbral lunar eclipse occurred at the Moon’s ascending node of orbit on Wednesday, October 7, 1987,[1] with an umbral magnitude of −0.0095. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A penumbral lunar eclipse occurs when part or all of the Moon's near side passes into the Earth's penumbra. Unlike a solar eclipse, which can only be viewed from a relatively small area of the world, a lunar eclipse may be viewed from anywhere on the night side of Earth. Occurring about 3.1 days after perigee (on October 4, 1987, at 1:35 UTC), the Moon's apparent diameter was larger.[2]
Visibility
[edit | edit source]The eclipse was completely visible over much of North America, South America, west Africa, and western Europe, seen rising over northwestern North America and the central Pacific Ocean and setting over much of Africa, Europe, and west and central Asia.[3]
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Eclipse details
[edit | edit source]Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[4]
| Parameter | Value |
|---|---|
| Penumbral Magnitude | 0.98640 |
| Umbral Magnitude | −0.00949 |
| Gamma | 1.01890 |
| Sun Right Ascension | 12h49m09.5s |
| Sun Declination | -05°16'24.7" |
| Sun Semi-Diameter | 16'00.1" |
| Sun Equatorial Horizontal Parallax | 08.8" |
| Moon Right Ascension | 00h47m14.4s |
| Moon Declination | +06°09'13.6" |
| Moon Semi-Diameter | 16'04.0" |
| Moon Equatorial Horizontal Parallax | 0°58'58.1" |
| ΔT | 55.6 s |
Eclipse season
[edit | edit source]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.
| September 23 Descending node (new moon) |
October 7 Ascending node (full moon) |
|---|---|
| File:SE1987Sep23A.png | Error creating thumbnail: |
| Annular solar eclipse Solar Saros 134 |
Penumbral lunar eclipse Lunar Saros 146 |
Related eclipses
[edit | edit source]Eclipses in 1987
[edit | edit source]- A hybrid solar eclipse on March 29.
- A penumbral lunar eclipse on April 14.
- An annular solar eclipse on September 23.
- A penumbral lunar eclipse on October 7.
Metonic
[edit | edit source]- Preceded by: Lunar eclipse of December 20, 1983
- Followed by: Lunar eclipse of July 26, 1991
Tzolkinex
[edit | edit source]- Preceded by: Lunar eclipse of August 26, 1980
- Followed by: Lunar eclipse of November 18, 1994
Half-Saros
[edit | edit source]- Preceded by: Solar eclipse of October 2, 1978
- Followed by: Solar eclipse of October 12, 1996
Tritos
[edit | edit source]- Preceded by: Lunar eclipse of November 6, 1976
- Followed by: Lunar eclipse of September 6, 1998
Lunar Saros 146
[edit | edit source]- Preceded by: Lunar eclipse of September 25, 1969
- Followed by: Lunar eclipse of October 17, 2005
Inex
[edit | edit source]- Preceded by: Lunar eclipse of October 27, 1958
- Followed by: Lunar eclipse of September 16, 2016
Triad
[edit | edit source]- Preceded by: Lunar eclipse of December 6, 1900
- Followed by: Lunar eclipse of August 7, 2074
Lunar eclipses of 1984–1987
[edit | edit source]This eclipse is a member of a semester series. An eclipse in a semester series of lunar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternating nodes of the Moon's orbit.[5]
The penumbral lunar eclipse on June 13, 1984 occurs in the previous lunar year eclipse set.
Saros 146
[edit | edit source]This eclipse is a part of Saros series 146, repeating every 18 years, 11 days, and containing 72 events. The series started with a penumbral lunar eclipse on July 11, 1843. It contains partial eclipses from October 17, 2005 through May 14, 2348; total eclipses from May 25, 2366 through November 16, 2654; and a second set of partial eclipses from November 27, 2672 through June 12, 2997. The series ends at member 72 as a penumbral eclipse on August 29, 3123.
The longest duration of totality will be produced by member 37 at 99 minutes, 22 seconds on August 8, 2492. All eclipses in this series occur at the Moon’s ascending node of orbit.[6]
| Greatest | First | |||
|---|---|---|---|---|
| The greatest eclipse of the series will occur on 2492 Aug 08, lasting 99 minutes, 22 seconds.[7] | Penumbral | Partial | Total | Central |
| 1843 Jul 11 |
2005 Oct 17 File:Lunar eclipse chart close-2005Oct17.png |
2366 May 25 |
2438 Jul 07 | |
| Last | ||||
| Central | Total | Partial | Penumbral | |
| 2546 Sep 11 |
2654 Nov 16 |
2997 Jun 12 |
3123 Aug 29 | |
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.
Tritos series
[edit | edit source]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.
Inex series
[edit | edit source]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 | |||||
|---|---|---|---|---|---|
| 1814 Feb 04 (Saros 140) |
1843 Jan 16 (Saros 141) |
1871 Dec 26 (Saros 142) | |||
| 1900 Dec 06 (Saros 143) |
1929 Nov 17 (Saros 144) |
1958 Oct 27 (Saros 145) | |||
| File:Lunar eclipse chart close-1929Nov17.png | File:Lunar eclipse from moon-1929Nov17.png | File:Lunar eclipse chart close-1958Oct27.png | File:Lunar eclipse from moon-1958Oct27.png | ||
| 1987 Oct 07 (Saros 146) |
2016 Sep 16 (Saros 147) |
2045 Aug 27 (Saros 148) | |||
| Error creating thumbnail: | Error creating thumbnail: | File:Lunar eclipse chart close-2016Sep16.png | File:Lunar eclipse from moon-2016Sep16.png | File:Lunar eclipse chart close-2045Aug27.png | File:Lunar eclipse from moon-2045Aug27.png |
| 2074 Aug 07 (Saros 149) |
2103 Jul 19 (Saros 150) |
2132 Jun 28 (Saros 151) | |||
| 2161 Jun 08 (Saros 152) |
2190 May 19 (Saros 153) | ||||
Half-Saros cycle
[edit | edit source]A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[8] This lunar eclipse is related to two partial solar eclipses of Solar Saros 153.
| October 2, 1978 | October 12, 1996 |
|---|---|
| File:SE1978Oct02P.png | File:SE1996Oct12P.png |
See also
[edit | edit source]Notes
[edit | edit source]- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Listing of Eclipses of series 146
- ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
External links
[edit | edit source]- 1987 Oct 07 chart Eclipse Predictions by Fred Espenak, NASA/GSFC
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