365 Days of the Moon--August 20, 2014

Cordillera Mountains, Cruger, and Sirsalis Rille

Observers tend to avoid the full Moon because illumination is so flat that small details are hard to see. But near full Moon is also the only time you can see features along the Moon's far western limb. Here is where I search for glimpses of elusive Mare Orientale (Eastern Sea). Never mind the Eastern Sea is on the western side of the Moon. How that happened is fodder for another story. But in this image, my view was about a day too soon to see the actual mare patch of Orientale. Instead, we can see evidence of the impact rings the surround the Orientale Basin which contains Mare Orientale. At the left we see a wall-like feature casting a shadow. This is the Cordillera Mountains which are actually the outer impact ring of the Orientale Basin. On the horizon beyond the Cordillera lies the ridge of the Rook Mountains, the next impact ring. Territory beyond the Rooks is still in shadow and not visible in this image.

Also visible is the southern half of Rima Sirsalis, seen slashing in from the upper right. The other rille crossing Sirsalis is Rima Darwin. The dark lake of the lava filled crater Cruger is at the top while the fresh bright ray system radiating from Byrgius A is at lower right.

Image taken with a Celestron 11 Edge HD, 2.5X Powermate, and Skyris 274M camera.

Image and content Copyright Robert Reeves 2014

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