Alphonsus

Move your mouse over the picture to see the names of some of the features.  Click here to see a mosaic of six pictures of this area.

Alphonsus is an old crater, at about 3,900 million years, but not quite as old as Ptolemaeus to the north as can be seen by the fact that the walls of Alphonsus encroach on Ptolemaeus.  It is 121 Km in diameter and its walls rise to 2730 metres.  Albetragius to the south is about the same age, is 41 Km in diameter, but its walls rise to 3900 metres above its floor. Catena Davy, in the top, left-hand corner of this picture, is an interesting string of small craters ranging from 1 to 3 Km in diameter.  It was probably caused by the impact of several pieces of the same object or possibly by a spray of ejecta from another crater.  The walled plain that it crosses is known as Davy Y despite the fact that it is much larger than Davy itself.  Davy A is just visible on the edge of this picture but Davy itself is just a little futher west.  It can be seen, however, in my smaller-scaled picture of this area. The picture was taken with a ToUcam attached to my LX200 with a X2 adaptor lens on 6th September 2004 when the Moon was 21.8 days old.

Date and Time	6th September 2004 04:36 UT
Camera	ToUcam 740K
Telescope	LX200 with X2 lens
Capture	K3CCDTools. High gamma, 1/50", 31% gain, 309 frames
Processing	Registax. 142 frames stacked. Wavelet 1,2 = 10

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