• Don SpainEmail author
Part of the Astronomer's Pocket Field Guide book series (ASTROPOC)


Piccolomini (53 miles) is an exceptional crater. Its steep walls rise 2½ miles above the floor. The walls are terraced and surround a flat floor. The great central peak rises over a mile and has several summits. Other than the massive central mountain I can see no detail on the floor. This great formation is a grand sight 5 days after new Moon. Be sure to point this one at a public observation.

Rupes Altai or the Altai Range is long length of curving mountains. It is actually a scarp, or a fault that slopes toward the Sea of Nectar. It is almost 300 miles long, higher at the northern end and much lower at the southern end. With the sun rising on it 5 days after new Moon this formation is an imposing sight.


Central Peak Good Part Great Formation Central Mountain Northern Wall 
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© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.Louisville Astronomical SocietyLouisvilleUSA

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