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The Lunar "X"
About this observation
Observer
Rik Hill
Time of observation
14/05/2016 - 10:17
Object
An "X" on the moon.
Observing location
Loudon Observatory, Tucson, Arizona, USA ( long. -110.77639 deg. W lat. +32.18025 deg.)
Equipment
3.5" Questar @ f/24.4 (internal barlow)
SKYRIS 445M camera + 656.3 filter
SKYRIS 445M camera + 656.3 filter
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In the center of image is the flat bottomed 65km diameter crater Apianus. Just above it is the slightly smaller crater Playfair (49km), half in shadow here. Between them and slightly left (west) is the large 94km basin simply named Playfair G. To the lower left of Playfair are two large shadow filled craters. The lower one is the 82km Aliacensis, and to the upper left from that the 71km Werner. These two craters point right to the "X".
This interesting feature is formed from the walls of Purbach and Blanchinus which are largely in shadow except for the higher parts of their walls. Blanchinus is directly above Werner and Purbach immediately to its left.
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