From Ocean to Sea

Object Name: Moon Craters Letronne and Gassendi
Object Type: Lunar craters
Location: Pittsburgh, PA, USA
Date: 1979-May-8
Media: graphite pencils on plain white paper; scanned to jpeg as original.
Equipment Used: 4.25 inch Newtonian; 192x
Observing Conditions: fair, calm
Aspects of Interests: The submerged wall of Letronne is very interesting, especially as a contrast to the steep walled crater Gassendi. Gassendi A and B are the small craters infringing on Gassendi’s North wall. Very dark in the middle suggests that they are deep and possibly young. Well defined details on all these objects except the walls of Mare Humorum to the South seen as very flat and without detail except at its Western edge where Gassendi lies across it. The area is mapped as Rima Mersenius. Illuminated walls are very bright. The maria are a very pale grey. I think Rima Herigonius is the bright light with distinct dark edge to the East of the group.
Thank you,
Jim Garasich