April 24, 2009
Double Crossed
image by Stefan Lammel
Twenty-four kilometers of diameter separate 114 km Albategnius and 138 km Hipparchus, as do vast amounts of modification. Both craters are older than the Imbrium Basin, for both are affected by its ejecta. But Albategnius is much less altered from its pristine impact condition. It still has a well-defined massive rim that rises 3.2 km above its obviously flooded floor. Because the floor is not dark under high illumination it is not mare basalt, and the lack of dark halo impact craters suggests that the light hue is not just a patina of ejecta over basalt. The supposition is that the smooth floor material is fluidized ejecta from Imbrium's formation. Like the material on the floor of nearby Ptolemaeus the ejecta thickly draped pre-existing craters on Albategnius' floor creating the Chuck Wood
Technical Details
April 2, 2009, 19:05 UT. 10in f4.8 Newtonian, Infinity 2-1M, 5x Powermate, blue filter, Avistack, Registax v.5, PSE5, Focus Magic
Related Links
Rükl plate 44
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