July 6, 2022
Seeing Through a Glass Clearly
Originally published August 14, 2012
image by F. Colas, J.L. Dauvergne, M. Delcroix, T. Legault and Christian Viladrich
Thomas Elger, the leader of lunar observers at the end of the 19th century, called Clavius one of the most striking of telescopic objects. However familiar we may consider ourselves to be with its features, there is always something fresh to note and to admire as often as we examine its apparently inexhaustible details. This new image from the Pic du Midi 33" refractor reduces the number of those inexhaustable details. This image is better than previous telescopic images, but it should be because of using a telescope 2-4 times larger than what's in most amateur's backyards. We are simply lucky to have all such great images. This view adds improved defintion to all the features in Clavius, including the features defined by a lack. The lack of roughness and reduced number of impact craters at the bottom center of the crater and near top center confirms that these apparently younger surfaces are real. Another real place is the light-hued rectangle in the middle of the floor that looks like where a chaulk-dusted eraser was banged against a blackboard. Even looking with LRO closeups this does not appear to be a splat of Tycho ejecta for there are no embedded secondary craters. So this great images makes some features better seen and clarifies our search for explanations.
Aug. 7, 2012. 1 m Pic du Midi telescope + Skynyx 2.1M camera + RG610 filter. This is a mosaic of 3 frames, each being the addition of 400
images; processing was done with Autostakkert.
Rükl plate 72
Yesterday's LPOD: Chains
Tomorrow's LPOD: Inside the Rainbow