A triplet of similarly sized craters, Theophilus, Cyrillus, and Catharina, are situated vertically from north to south on the lunar terminator. The plain to the east is Mare Nectaris. Fracastorius is the ancient, flooded crater in the lower left corner of the image. (A. Ruki 46, 47, 57, 58)
ZWO ASI178MC
Meade LX850 (12" f/8)
Losmandy G11
Captured 3,000 frames in Firecapture
Stacked best 1,500 frames in Autostakkert
Wavelet sharpened in Registax
Finished in Photoshop