Ptolemaeus & Catena Davy

December 19, 2007

Uploaded 2/13/08

South is up in this image, more info below.

1290 x 960

 This last image on the night of the 19th contains the large 93 mile diameter walled plain Ptolemaeus on the left center, and Mare Nubium on the right. Several features in this area caught my eye. First, just above center is a small crater chain inside the crater Davy. It is 30 miles long, with small 1 - 2 mile sized craterlets defining it. A fragmenting asteroid has been deemed the culprit here. Also, another crater chain is just touching the lower left edge of Ptolemaeus, that includes the small crater Muller. Elongate gouges across the plateaus in the center are related to the formation of the huge basin Mare Imbrium,

Processing: 300/1000 best frames, MAP 45 alignment in Registax, Wavelets in PixInsight Pro, Levels and Contrast Masking In Photoshop CS3, Focus Magic Plugin.

Instrument: 12.5" f/5 with 1.8x Barlow Platform: Astrophysics AP1200 CCD Camera: Image Source DMK 31AU03.AS Filter: Hoya R72 Exposure: 1/60 sec 15fps Location: Payson, Arizona Elevation: 5150 ft. Sky: Seeing good, Transparency 8/10 Outside Temperature: 35F Processing: Registax, PixInsight Pro, Photoshop CS3, Focus Magic Plugin