A penumbral lunar eclipse occurred at the Moon’s ascending node of orbit on Saturday, May 25, 2013,[1] with an umbral magnitude of −0.9322. 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 only about 18 hours before perigee (on May 25, 2013, at 21:40 UTC), the Moon's apparent diameter was larger.[2]
| Penumbral eclipse | |||||||||
 The Moon barely grazed the northern penumbral shadow of the Earth. | |||||||||
| Date | May 25, 2013 | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Gamma | 1.5350 | ||||||||
| Magnitude | −0.9322 | ||||||||
| Saros cycle | 150 (1 of 71) | ||||||||
| Penumbral | 33 minutes, 34 seconds | ||||||||
| |||||||||
This eclipse was visually imperceptible due to the small entry into the penumbral shadow. It also marked the beginning of Saros series 150.
Visibility
editThe eclipse was completely visible over much of North and South America, west Africa, and western Europe, seen rising over the central Pacific Ocean and western Canada and setting over central Europe and central Africa.[3]
|
Hourly motion shown right to left |
 The Moon's hourly motion across the Earth's shadow in the constellation of Scorpius. |
 Visibility map | ||
Images
edit
Gallery
edit-
Animation of the eclipse viewed from South pole of the Moon
Eclipse details
editShown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[4]
| Parameter | Value |
|---|---|
| Penumbral Magnitude | 0.01702 |
| Umbral Magnitude | −0.93215 |
| Gamma | 1.53512 |
| Sun Right Ascension | 04h08m32.9s |
| Sun Declination | 20°58'05.1" |
| Sun Semi-Diameter | 15'47.5" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 16h09m09.9s |
| Moon Declination | -19°24'45.3" |
| Moon Semi-Diameter | 16'38.2" |
| Moon Equatorial Horizontal Parallax | 1°01'03.5" |
| ΔT | 67.1 s |
Eclipse season
editThis 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.
| April 25 Ascending node (full moon) |
May 10 Descending node (new moon) |
May 25 Ascending node (full moon) |
|---|---|---|
 |
 |
|
| Partial lunar eclipse Lunar Saros 112 |
Annular solar eclipse Solar Saros 138 |
Penumbral lunar eclipse Lunar Saros 150 |
Related eclipses
editEclipses in 2013
edit- A partial lunar eclipse on April 25.
- An annular solar eclipse on May 10.
- A penumbral lunar eclipse on May 25.
- A penumbral lunar eclipse on October 18.
- A hybrid solar eclipse on November 3.
Metonic
edit- Preceded by: Lunar eclipse of August 6, 2009
Tzolkinex
edit- Followed by: Lunar eclipse of July 5, 2020
Tritos
edit- Preceded by: Lunar eclipse of June 24, 2002
Lunar Saros 150
edit- Followed by: Lunar eclipse of June 5, 2031
Inex
edit- Preceded by: Lunar eclipse of June 13, 1984
Triad
edit- Preceded by: Lunar eclipse of July 25, 1926
Lunar eclipses of 2009–2013
editThis eclipse is the one of five lunar eclipses in a short-lived series. The lunar year series repeats after 12 lunations or 354 days (Shifting back about 10 days in sequential years). Because of the date shift, the Earth's shadow will be about 11 degrees west in sequential events.
| Lunar eclipse series sets from 2009–2013 | ||||||||
|---|---|---|---|---|---|---|---|---|
| Ascending node | Descending node | |||||||
| Saros # Photo |
Date Viewing |
Type chart |
Gamma | Saros # Photo |
Date Viewing |
Type chart |
Gamma | |
| 110 | 2009 Jul 07
|
penumbral
|
−1.4916 | 115
|
2009 Dec 31
|
partial
|
0.9766 | |
120
|
2010 Jun 26
|
partial
|
−0.7091 | 125
|
2010 Dec 21
|
total
|
0.3214 | |
130
|
2011 Jun 15
|
total
|
0.0897 | 135
|
2011 Dec 10
|
total
|
−0.3882 | |
140
|
2012 Jun 04
|
partial
|
0.8248 | 145 | 2012 Nov 28
|
penumbral
|
−1.0869 | |
| 150 | 2013 May 25
|
penumbral
|
1.5351 | |||||
| Last set | 2009 Aug 06 | Last set | 2009 Feb 9 | |||||
| Next set | 2013 Apr 25 | Next set | 2013 Oct 18 | |||||
Saros 150
editThis is the first lunar eclipse of Saros series 150.[5] The next occurrence will also be a penumbral eclipse on 5 June 2031. Solar Saros 157 interleaves with this lunar saros with an event occurring every 9 years 5 days alternating between each saros series.
Partial eclipses in series 150 will occur between 20 August 2157 and past the year 3000. Total eclipses will occur between 29 April 2572 and 28 August 2770.
See also
edit- List of lunar eclipses and List of 21st-century lunar eclipses
- File:Penumbral eclipse of May 25, 2013 from lunar south pole.gif Animation of Earth as seen from lunar south pole during the eclipse.
Notes and references
edit- ^ "May 24–25, 2013 Penumbral Lunar Eclipse". timeanddate. Retrieved 15 November 2024.
- ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 15 November 2024.
- ^ "Penumbral Lunar Eclipse of 2013 May 25" (PDF). NASA. Retrieved 15 November 2024.
- ^ "Penumbral Lunar Eclipse of 2013 May 25". EclipseWise.com. Retrieved 15 November 2024.
- ^ "Saros Series of Lunar Eclipses".
External links
edit- 2013 May 25 chart: Eclipse Predictions by Fred Espenak, NASA/GSFC
