Monday, June 06, 2005
PythagorasHere's a nice image of Pythagoras (Rukl map 2), a large complex crater that is situated near the northwestern limb of the Moon. On the image you can see the central mountains throwing their shadow across the crater floor. This young crater with a diameter of 128 km and a depth of 5000 meters is a typical example of a complex crater with terraced walls, central peaks, and a relatively flat floor full of hills.
A few degenerated large craters surround Pythagoras. In front of Pythagoras, to the left, lies Babbage with on its floor two smaller craters, Babbage A and C. In front of Babbage lies a more or less rectangular degenerated crater South. This crater is very hard to detect on this image. Only the eastern rim is clearly visible. To the east and southeast of Pythagoras lies Anaximander and J. Herschel. These are both more or less degenerated craters as well. Towards the lunar limb you see the walls of two other craters lit by the Sun. These craters are Desargues and Pascal.
To find the Pythagoras area, start from Sinus Iridum (Rukl map 10) and move in north-northwestern direction across Mare Frigoris.
This image was shot on 22 April 2005 with the TAL 200K, a 20mm Vixen Lanthanum eyepiece, the Coolpix 4500 with 4 x optical zoom and two filters, the Baader Contrast Booster and the Baader IR/UV cut filter. Settings where shutter 1/30s, f 5.1, ISO 100. This image is the result of 10 stacked images (Keiths Image Stacker), processed changing the levels and applying unsharp masking.