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Penumbral Lunar Eclipse: October 18, 2013

Geographic Region: Americas, Europe, Africa, Asia

The last lunar eclipse of the year is a relatively deep penumbral eclipse with a magnitude of 0.7649. It should be easily visible to the naked eye as a dusky shading in the southern half of the Moon. The times of the major phases are listed below.


Penumbral Eclipse Begins:   21:50:38 UT
Greatest Eclipse:   23:50:17 UT
Penumbral Eclipse Ends:   01:49:49 UT


Note that the beginning and end of a penumbral eclipse are not visible to the eye.  In fact, no shading can be detected until about 2/3 of the Moon's disk is immersed in the penumbra.  This would put the period of nominal eclipse visibility from about 23:30 to 00:10 UT.  Keep in mind that this is only an estimate.  Atmospheric conditions and the observer's visual acuity are important factors to consider.  An interesting exercise is to note when penumbral shading is first and last seen.

The figure above shows a map of Earth showing the regions of eclipse visibility.  Eastern Canada will see the entire event while the rest of Canada and the USA will see moonrise with the eclipse already in progress.  Observers in Europe and Africa will also see the entire event, while eastern Asia misses the end because of moonset.

The October 18 penumbral lunar eclipse is the 52nd member of Saros 117, a series of 71 eclipses in the following sequence: 8 penumbral, 9 partial, 24 total, 7 partial, and 23 penumbral lunar eclipses (Espenak and Meeus, 2009).


Eclipse map and predictions courtesy of Fred Espenak - NASA/Goddard Space Flight Center.
For more information on solar and lunar eclipses, see Fred Espenak's Eclipse Home Page:






Lunar Eclipses for Students and Beginners!

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