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Revision 104 May 2011 - SurinyeOlarte

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META TOPICPARENT name="EclipseLu040504ca"
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Observation of earth's shadow on Moon Craters during this Lunar Eclipse

Back logo eng.jpg

Some of the most interesting events to measure during a lunar eclipse are the ingress and egress phases of the Earth's shadow in several lunar craters. The timing of craters is useful in determining the atmospheric enlargement of the Earth's shadow.(See Size and shape of the umbra during a lunar eclipse). The next table lists predicted umbral ingress and egress times for twenty well-defined lunar craters (using 2% umbral enlargement):


contcrat1.jpg

Ingress Time (UT)


contcrat4.jpg
Egress Time (UT)

18:52
Grimaldi
21:16
Grimaldi
18:57
Aristarchus
21:19
Billy
19:00
Billy
21:23
Campanus
19:00
Kepler
21:25
Tycho
19:07
Pytheas
21:29
Kepler
19:08
Copernicus
21:30
Aristarchus
19:11
Timocharis
21:37
Copernicus
19:13
Plato
21:39
Pytheas
19:13
Campanus
21:44
Timocharis
19:21
Aristoteles
21:49
Plato
19:22
Eudoxus
21:51
Manilius
19:22
Manilius
21:52
Dionysius
19:25
Tycho
21:55
Menelaus
19:25
Menelaus
21:57
Eudoxus
19:28
Dionysius
21:57
Aristoteles
19:29
Plinius
21:58
Plinius
19:38
Proclus
21:58
Goclenius
19:40
Taruntius
22:03
Langrenus
19:42
Goclenius
22:04
Taruntius
19:47
Langrenus
22:06
Proclus

From http://sunearth.gsfc.nasa.gov/eclipse/eclipse.html - F. Espenak, NASA/GSFC


We propose you to follow with us this event and with your collaboration we can find a better measure of Earth's shadow's shape for this eclipse. Remember that shadow's shape is different for every eclipse, so we can not lose this opportunity.


It is easy! You only have to measure ingress and egress times of the selected craters. If the crater is large enough, it will be possible to measure the times of starting and ending of the ingress (and egress) and then calculate the average for every ingress (or egress). If the crater is too small then you can take only one measure in the central position of the crater.


The times in the table are only for orientation. But you can use it with the aim of know what will be the next crater in ingress (or egress). Your measures will have some differences because it depends of atmosphere status in that moment.

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