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April 2013 lunar eclipse

A partial lunar eclipse occurred at the Moon’s ascending node of orbit on Thursday, April 25, 2013,[1] with an umbral magnitude of 0.0160. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A partial lunar eclipse occurs when one part of the Moon is in the Earth's umbra, while the other part is in 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 April 27, 2013, at 15:50 UTC), the Moon's apparent diameter was larger.[2]

April 2013 lunar eclipse
Partial eclipse
Partiality as viewed from Rabka-Zdrój, Poland, 20:10 UTC
DateApril 25, 2013
Gamma−1.0121
Magnitude0.0160
Saros cycle112 (65 of 72)
Partiality27 minutes, 0 seconds
Penumbral247 minutes, 42 seconds
Contacts (UTC)
P118:03:41
U119:54:04
Greatest20:07:29
U420:21:04
P422:11:23

Only a tiny sliver (1.48%) of the Moon was covered by the Earth's umbral shadow at maximum eclipse, but the entire northern half of the Moon was darkened from being inside the penumbral shadow. This was one of the shortest partial eclipses of the Moon in the 21st century, lasting 27 minutes. This was also the last of 58 umbral lunar eclipses in Lunar Saros 112.

Visibility

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The eclipse was completely visible over Africa, Europe, and Asia, seen rising over eastern South America and setting over Australia.[3]

   
 
Visibility map

Images

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NASA chart of the eclipse
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Eclipse details

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Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[4]

April 25, 2013 Lunar Eclipse Parameters
Parameter Value
Penumbral Magnitude 0.98783
Umbral Magnitude 0.01596
Gamma −1.01214
Sun Right Ascension 02h13m51.3s
Sun Declination +13°26'35.0"
Sun Semi-Diameter 15'53.7"
Sun Equatorial Horizontal Parallax 08.7"
Moon Right Ascension 14h12m51.4s
Moon Declination -14°25'34.1"
Moon Semi-Diameter 16'21.4"
Moon Equatorial Horizontal Parallax 1°00'01.6"
ΔT 67.1 s

Eclipse season

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See also: Eclipse cycle

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.

Eclipse season of April–May 2013
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
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Eclipses in 2013

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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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Lunar Saros 112

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Inex

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Triad

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Lunar eclipses of 2013–2016

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The lunar year series repeats after 12 lunations or 354 days, shifting back by about 10 days in consecutive years. Because of the date shift, the Earth's shadow will be about 11 degrees west in sequential events.

Lunar eclipse series sets from 2013–2016
Ascending node   Descending node
Saros Viewing
date 		Type Gamma Saros Viewing
date 		Type Gamma
112
  		2013 Apr 25
  		Partial
  		−1.0121 117
  		2013 Oct 18
  		Penumbral
  		1.1508
122
  		2014 Apr 15
  		Total
  		−0.3017 127
  		2014 Oct 08
  		Total
  		0.3827
132
  		2015 Apr 04
  		Total
  		0.4460 137
  		2015 Sep 28
  		Total
  		−0.3296
142 2016 Mar 23
  		Penumbral
  		1.1592 147
  		2016 Sep 16
  		Penumbral
  		−1.0549
Last set 2013 May 25 Last set 2012 Nov 28
Next set 2017 Feb 11 Next set 2016 Aug 18

Saros 112

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Lunar Saros series 112, repeating every 18 years and 11 days, has a total of 72 lunar eclipse events including 15 total lunar eclipses.

Greatest First
The greatest eclipse of the series occurred on 1490 Jun 02, lasting 100 minutes.[5] Penumbral Partial Total Central
859 May 20 985 Aug 03 1364 Mar 18 1436 Apr 30
Last
Central Total Partial Penumbral
1562 Jul 16 1616 Aug 27 2013 Apr 25
  		2139 Jul 12

There are 11 series events between 1901 and 2100, grouped into threes (called an exeligmos), each column with approximately the same viewing longitude on Earth.

1901–2100
1905 Feb 19 1923 Mar 3 1941 Mar 13
           
1959 Mar 24 1977 Apr 04 1995 Apr 15
           
2013 Apr 25 2031 May 07 2049 May 17
           
2067 May 28 2085 Jun 08
   

Half-Saros cycle

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A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[6] This lunar eclipse is related to two partial solar eclipses of Solar Saros 119.

April 19, 2004 April 30, 2022
   

See also

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References

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  1. ^ "April 25–26, 2013 Partial Lunar Eclipse". timeanddate. Retrieved 15 November 2024.
  2. ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 15 November 2024.
  3. ^ "Partial Lunar Eclipse of 2013 Apr 25" (PDF). NASA. Retrieved 15 November 2024.
  4. ^ "Partial Lunar Eclipse of 2013 Apr 25". EclipseWise.com. Retrieved 15 November 2024.
  5. ^ Listing of Eclipses of series 112
  6. ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
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