Janssen Home

Move your mouse over the picture to see the names of the various craters.

Janssen is a large (196 Km) and an ancient crater, more than 4,000 million years old, as can be seen from the fact that it is overlaid by many other craters.  The largest of these, Fabricius, is comparatively young at between 3,200 and 1,000 million years old.
This picture was taken at 14:40 local time (GMT), i.e. in broad daylight, using infra-red light to reduce the glow from the sky, and it needed considerable augmentation during processing to increase the contrast, which is poor in the original avi.
The scale markers are approximately 100 Km north and east.
The picture was taken with a ToUcam attached to my LX200 on 11th July 2005 at 14:40 UT, when the Moon was 4.6 days old.
Date and Time 11th July 2005 14:40 UT
Camera ToUcam 740K
Telescope LX200 at prime focus
Capture K3CCDTools. Low gamma, 1/33", 41% gain, 312 frames, IR light
Processing Registax. 183 frames stacked. Wavelet 2-6 = 5, contrast 215, brightness -112, histogram 20-255
PhotoImpact. Unsharp mask, factor 20, aperture 5. 
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