Altai Scarp to Crater Riccius
Always an eye catching feature when visible, the Altai scarp which is as tall as 4 km. was nicely reflecting sunlight on this evening. This scarp is the southwestern rim of the Nectarius basin and its fourth ring. The other features that caught my attention are the 3 old battered craters along the terminator: Zagut (84 km.), Rabbi Levi (81 km.) and Riccius (71 km.). The two younger, deeper craters between Rabbi Levi and Altai scarp are Lindenau (53 km.) and Rothmann (42 km.). All of these craters would go unnoticed at higher sun but low sun angles have a way of making them look good.
Sketching and Equipment:
For this sketch, I used black Strathmore 400 Artagain paper 9” x 12”, white and
black Conte’ pastel pencils and blending stumps.
Telesccope: 13.1 inch f/6 Dobsonian and 6 mm eyepiece (333x) riding on an equatorial platform
Date: 04-06-2014, 00:45-02:15 UT
Temperature: 4° C (40° F)
Seeing: Average - Antoniadi III
Colongitude 340.0 °
Lunation 6 days
Illumination 36 %
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