Ptolemaeus (153 km.). Ptolemaeus crater features are highlighted when the sun is at low angles during the first quarter and last. When is Full Moon, crater contour become more difficult to discern.
Alphonsus (108 km) is an ancient impact crater on the Moon that dates from the immediate post-Nectarian era. It is located on the mountainous eastern end of Mare Nubium, and overlaps slightly with Ptolemaeus crater to the north. The exterior walls are slightly distorted and have a shape somewhat hexagonal.
Ptolemaeus Alphonsus and Alpetragius craters
Video by: Victor Lupu
Optics: Celestron C8-Newtonian reflector telescope, plossl 20mm, 2x Barlow
Mount: CG5 (EQ5)
Device: Sony HDR CX105
Date: 15/02/2011
Location: Baia Mare, Romania
Processing: video capture
Saturday, January 21, 2012
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