Move your mouse over the picture to see the names of the various features.
This is the lower section of the mosaic, showing the area between Rheita in the north
and Vlacq in the South. The largest crater, at 196 Km, and oldest, at 4,200 million years, is Janssen.
Overlaying it to the north is Fabricius, 80 Km in diameter, 2500 metres deep and olny about 2,000 million years old.
On its northern edge is Metius, 90 Km across and 3000 metres deep and rather older at about 3,900 million years.
Vlacq, to the south, is another old crater at about 4,200 million years; it is 92 Km in diameter and 3000 metres deep.
Date and Time: 1st September 2004 23:54 UT
Camera: ToUcam 740K
Telescope: LX200
Capture: K3CCDTools. High gamma, 1/250", 15% gain, 318 frames
Processing: Registax. 100 frames stacked. Wavelet 1-3 = 10
This is the same area imaged 14 months later at the same phase. Janssen is an interesting feature. It is evidently ancient, overlayed by many other craters. It appears to be filled by debris in the north-west, possibly displaced material from the creation of Fabricus some 2,000 million years later. There is also a very strange cleft running through this debris from the southern edge of Fabricus. Does this cleft curve round and extend to the edge of Janssen close to Jenssen D? Another example of slumping caused by an overlapping crater can be seen in Watt. There is a beautiful picture of Watt in Lunar Picture of the Day for 18th January 2006.
Date and Time: 18th November 2005 22:54 UT
Camera: ToUcam 740K
Telescope: LX200
Capture: K3CCDTools. High gamma, 1/50", 8% gain, 514 frames
Processing: Registax. 48 frames stacked. Wavelet 1-2 = 10, gamma 0.8 Home Back to SE Quadrant