April 8, 2009

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Rilles Almost All Around

LPOD-Apr8-09.jpg
image by " rel="nofollow Damian Peach

No, the vertical line crossing the top half of Arzachel's floor is not a mosaic seam boundary. It is the best view so far of a straight rille that was detected " rel="nofollow previously. With Damian's new image, there is a suggestion that the radial rille is tenuously crossed by a crater chain/rille extending from the bird's foot end of the Arzachel Rille. Opposite " rel="nofollow lighting supports this interpretation, but it is not certain if the connection is real. Damian's impressive image also confirms faint, apparently degraded rille segments cutting a rubbly area of the southern part of the floor. Thus, rilles have been imaged on three sides of Arzachel's floor; it will be interesting when modern orbiter images become available - or terrestrial imagers make the next quantum improvement - if rilles are found on the western side. If a crater floor moved up or down, I'd expect all parts to be fractured.

" rel="nofollow Chuck Wood

Technical Details
April 3, 2009; approx. 20:00 UTC. 14" telescope at 51°35"N, 00°45"W. Lunar altitude: 59°.

Related Links
Rükl plate 55

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