Mare Nubium / Mare Humorum Rills

December 19, 2007

Uploaded 1/30/08

South is up in this image, more info below.

1290 x 960 size

 This prime focus image includes a fairly tame region for details, however closer examination reveals some amazing features. The straight wall, Rupes Recta is a 70 mile long scarp (cliff) that in places is over 1000 feet tall. There is no equal to such a structure here on Earth. The large smooth sea that dominates the center of this frame is Mare Nubium, with the steep walls 60 mile diameter crater with walls exceeding ten thousand feet in height. What really compelled me to posting this image is the concentric rilles to the left of the half covered Mare Humorum on the upper right terminator. Known collectively as Rimae Hippalus, these are stress fractures left over from the formation of Mare Humorum. Look how beautifully they wrap around the basin.

Processing: 300/1000 best frames, MAP 35 alignment in Registax, Regulated Van Cittert Deconvolution in PixInsight Pro, Levels and Contrast Masking In Photoshop CS3, Focus Magic Plugin.

Instrument: 12.5" f/5 prime Platform: Astrophysics AP1200 CCD Camera: Image Source DMK 31AU03.AS Filter: Hoya R72 Exposure: 1/100 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