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Wikipedia / December 2009 lunar eclipse

A partial lunar eclipse occurred at the Moon’s descending node of orbit on Thursday, 31 December 2009, with an umbral magnitude of 0.0779. 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 only about 20 hours before perigee (on 1 January 2010, at 15:30 UTC), the Moon's apparent diameter was larger.

This eclipse was the last of four lunar eclipses in 2009, with the others occurring on February 9 (penumbral), July 7 (penumbral), and August 6 (penumbral).

This lunar eclipse was also notable, because it occurred during a blue moon (a second full moon in December) and was near perigee (making it a supermoon). The next eclipse on New Year's Eve and blue moon will occur on 31 December 2028.

Only a small portion of the Moon entered the Earth's umbral shadow, but there was a distinct darkening visible over the Moon's southern surface at greatest eclipse.

Visibility

The eclipse was completely visible over Europe, Asia, and much of Africa, seen rising over eastern North America and setting over Australia and the Pacific Ocean.

Hourly motion shown right to left

The Moon's hourly motion across the Earth's shadow in the constellation of Gemini.

Visibility map

Images

Gallery

Progression from Degania A, Israel

Eclipse details

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

Parameter

Value

Penumbral Magnitude

1.05719

Umbral Magnitude

0.07793

Gamma

0.97660

Sun Right Ascension

18h44m37.2s

Sun Declination

-23°02'33.1"

Sun Semi-Diameter

16'15.9"

Sun Equatorial Horizontal Parallax

08.9"

Moon Right Ascension

06h45m22.4s

Moon Declination

+24°01'10.3"

Moon Semi-Diameter

16'36.6"

Moon Equatorial Horizontal Parallax

1°00'57.6"

ΔT

66.1 s

31 December 2009 Lunar Eclipse Parameters

Eclipse season

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.

December 31Descending node (full moon)

15 JanuaryAscending node (new moon)

Partial lunar eclipseLunar Saros 115

Annular solar eclipseSolar Saros 141

Eclipse season of December 2009–January 2010

Related eclipses

Eclipses in 2009

Metonic

Tzolkinex

Half-Saros

Tritos

Lunar Saros 115

Inex

Triad

Lunar eclipses of 2009–2013

Saros 115

Tritos series

Inex series

Half-Saros cycle

A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros). This lunar eclipse is related to two partial solar eclipses of Solar Saros 122.

25 December 2000

6 January 2019

See also

References