September 1998 lunar eclipse
| Penumbral eclipse | |||||||||
| File:Lunar eclipse chart close-1998Sep06.png The Moon's hourly motion shown right to left | |||||||||
| Date | September 6, 1998 | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Gamma | −1.1058 | ||||||||
| Magnitude | −0.1544 | ||||||||
| Saros cycle | 147 (8 of 71) | ||||||||
| Penumbral | 227 minutes, 46 seconds | ||||||||
| |||||||||
A penumbral lunar eclipse occurred at the Moon’s descending node of orbit on Sunday, September 6, 1998,[1] with an umbral magnitude of −0.1544. 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 1.8 days before perigee (on September 8, 1998, at 7:00 UTC), the Moon's apparent diameter was larger.[2]
Visibility
[edit | edit source]The eclipse was completely visible over northeast Asia, much of Australia, western North America and the Pacific Ocean, seen rising over east and southeast Asia and western Australia and setting over much of North and South America.[3]
| File:Lunar eclipse from moon-1998Sep06.png File:Lunar eclipse chart close-1998Sep06.png |
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 | 0.81217 |
| Umbral Magnitude | −0.15437 |
| Gamma | −1.10579 |
| Sun Right Ascension | 10h59m47.2s |
| Sun Declination | +06°25'26.3" |
| Sun Semi-Diameter | 15'52.1" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 23h01m06.1s |
| Moon Declination | -07°29'07.2" |
| Moon Semi-Diameter | 16'25.0" |
| Moon Equatorial Horizontal Parallax | 1°00'15.2" |
| ΔT | 63.3 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. The first and last eclipse in this sequence is separated by one synodic month.
| August 8 Descending node (full moon) |
August 22 Ascending node (new moon) |
September 6 Descending node (full moon) |
|---|---|---|
| File:Lunar eclipse chart close-1998Aug08.png | File:SE1998Aug22A.png | File:Lunar eclipse chart close-1998Sep06.png |
| Penumbral lunar eclipse Lunar Saros 109 |
Annular solar eclipse Solar Saros 135 |
Penumbral lunar eclipse Lunar Saros 147 |
Related eclipses
[edit | edit source]Eclipses in 1998
[edit | edit source]- A total solar eclipse on February 26.
- A penumbral lunar eclipse on March 13.
- A penumbral lunar eclipse on August 8.
- An annular solar eclipse on August 22.
- A penumbral lunar eclipse on September 6.
Metonic
[edit | edit source]- Preceded by: Lunar eclipse of November 18, 1994
- Followed by: Lunar eclipse of June 24, 2002
Tzolkinex
[edit | edit source]- Preceded by: Lunar eclipse of July 26, 1991
- Followed by: Lunar eclipse of October 17, 2005
Half-Saros
[edit | edit source]- Preceded by: Solar eclipse of August 31, 1989
- Followed by: Solar eclipse of September 11, 2007
Tritos
[edit | edit source]- Preceded by: Lunar eclipse of October 7, 1987
- Followed by: Lunar eclipse of August 6, 2009
Lunar Saros 147
[edit | edit source]- Preceded by: Lunar eclipse of August 26, 1980
- Followed by: Lunar eclipse of September 16, 2016
Inex
[edit | edit source]- Preceded by: Lunar eclipse of September 25, 1969
- Followed by: Lunar eclipse of August 17, 2027
Triad
[edit | edit source]- Preceded by: Lunar eclipse of November 6, 1911
- Followed by: Lunar eclipse of July 7, 2085
Lunar eclipses of 1995–1998
[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 August 8, 1998 occurs in the next lunar year eclipse set.
Saros 147
[edit | edit source]This eclipse is a part of Saros series 147, repeating every 18 years, 11 days, and containing 70 events. The series started with a penumbral lunar eclipse on July 2, 1890. It contains partial eclipses from September 28, 2034 through May 27, 2431; total eclipses from June 6, 2449 through October 5, 2647; and a second set of partial eclipses from October 16, 2665 through May 1, 2990. The series ends at member 70 as a penumbral eclipse on July 28, 3145.
The longest duration of totality will be produced by member 37 at 105 minutes, 18 seconds on August 1, 2539. All eclipses in this series occur at the Moon’s descending node of orbit.[6]
| Greatest | First | |||
|---|---|---|---|---|
| The greatest eclipse of the series will occur on 2539 Aug 01, lasting 105 minutes, 18 seconds.[7] | Penumbral | Partial | Total | Central |
| 1890 Jul 02 |
2034 Sep 28 File:Lunar eclipse chart close-2034Sep28.png |
2449 Jun 06 |
2485 Jun 28 | |
| Last | ||||
| Central | Total | Partial | Penumbral | |
| 2593 Sep 02 |
2647 Oct 05 |
2990 May 01 |
3134 Jul 28 | |
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 | |||||
|---|---|---|---|---|---|
| 1825 Jan 04 (Saros 141) |
1853 Dec 15 (Saros 142) |
1882 Nov 25 (Saros 143) | |||
| 1911 Nov 06 (Saros 144) |
1940 Oct 16 (Saros 145) |
1969 Sep 25 (Saros 146) | |||
| File:Lunar eclipse chart close-1911Nov06.png | File:Lunar eclipse from moon-1911Nov06.png | File:Lunar eclipse chart close-1940Oct16.png | File:Lunar eclipse from moon-1940Oct16.png | File:Lunar eclipse chart close-1969Sep25.png | File:Lunar eclipse from moon-1969Sep25.png |
| 1998 Sep 06 (Saros 147) |
2027 Aug 17 (Saros 148) |
2056 Jul 26 (Saros 149) | |||
| File:Lunar eclipse chart close-1998Sep06.png | File:Lunar eclipse from moon-1998Sep06.png | File:Lunar eclipse chart close-2027Aug17.png | File:Lunar eclipse from moon-2027Aug17.png | File:Lunar eclipse chart close-2056Jul26.png | File:Lunar eclipse from moon-2056Jul26.png |
| 2085 Jul 07 (Saros 150) |
2114 Jun 18 (Saros 151) |
2143 May 28 (Saros 152) | |||
| 2172 May 08 (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 154.
| August 31, 1989 | September 11, 2007 |
|---|---|
| File:SE1989Aug31P.png | File:SE2007Sep11P.png |
See also
[edit | edit source]References
[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 147
- ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
External links
[edit | edit source]- Saros cycle 147
- 1998 Sep 06 chart Eclipse Predictions by Fred Espenak, NASA/GSFC
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