[AZ-Observing] Favorable Lunar Libration and Mare Orientale
- From: Tom Polakis <tpolakis@xxxxxxx>
- To: AZ-Observing@xxxxxxxxxxxxx
- Date: Sat, 10 Mar 2007 0:29:10 -0500
While surfing through Guy Ottwell's excellent "Astronomical Calendar" for 2007,
I noticed that the maximum lunar libration for the year occurs on March 12.
This means that features such as Mare Crisium will be shifted to nearly the
limb while the crater Grimaldi will appear far less foreshortened. It also
means that we can glimpse the great Orientale Basin for the next five nights or
so.
A search through the Cloudynights Lunar Observing archives turned up some good
discussions about extreme librations. Mare Orientale isn't much to look at.
Here are views compared for librations in longitude of roughly -4 and -7
degrees.
http://tinyurl.com/4zy9n
According to this libration calculator applet
(http://www.jgiesen.de/moonlibration/index.htm), the libration on Saturday
morning is -5.6d. By early next week, it will increase to -7.5d. It looks
like the show is over by the 15th.
Tom
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