365 Days of the Moon -- August 05, 2014

Torricelli, Sinus Asperitatis, Rimma Hypatia



This is a fun place on the Moon. To set the location, the Apollo 11 landing area on Mare Tranquilitatis is at the top just left of center and the massive crater Theophilus is just protruding into the bottom. In the center, we see the curious pear-shaped crater Torricelli laying within the larger ghost crater Torricelli R. Both of these craters lay within Sinus Asperitatis, or the "Bay of Roughness", which forms the straight between Mare Tranquilitatis and Mare Nectaris. Torricelli is actually an overlapping pair of craters that creates the pear-shape illusion. On the southern plains of Sinus Asperitatis we can see both the streamers of the ground surge that splashed outward from the Theophilus impact and a field of smaller secondary craters formed by blocks of material thrown out of Theophilus. Also at the top of the image is the lengthy Hypatia Rille, a feature called a graben, or slumping of land between two parallel faults. If a 45-year old memory serves, I think this is the "Diamondback Rille" used as a navigation landmark by Apollo 11.


Image taken through a Celestron 8 with a 2.5X Powermate and DMK-41 monochrome camera.


Image copyright Robert Reeves 2014


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