IWLOP #069 - Aristillus & Autolycus
Two outstanding craters in the Mare Imbrium that contrast nicely in size. They are both Copernican era impacts with Aristillus featuring a notable ejecta blanket.
Location: 33.9 N 1.2 E Origin: Impact Size: 55 km (Aristillus), 39 km (Autolycus) Rukl: 12 Type: Complex Craters (CC)
Objects: Aristillus, Autolycus, Sinus Lunicus, Luna 2 landing, and Aristillus A, B, C, & D
Others Identified: Alpetragious, Alphonsus, Ammonius, Arzachel, Herschel, Nonius, Ptolemaeus, Thebit, Walther
Time: 8:05 PM ADT
Equipment: 10" Meade SCT, 10 mm eyepiece + x2 Barlow
Seeing: Good (3)
Transparency: Good (3)
R1: The ejects blanket of Aristillus rays out from its high crater sides. Autolycus doesn't appear to have ejecta to the same degree and is shallower than Aristillus.
C1: Very small secondary craters (A, B, C, D) were located near Aristillus and appeared to be located along the ejecta lines / rays.