July 15, 2020
Green, but not Cheese
Originally published February 1, 2011
south up image by Michael Hunnekuhl, Hannover Germany
Michael's false color images are revealing but I'm not quite sure what they are telling us. I have enhanced this image considerably beyond the more natural colors that Michael originally showed. Here the color is mostly a military brown, with bright spots around fresh impact craters, including the odd bluish one near Descartes (upper right). But looking closer there are patches that are reddish, yellowish and some even with hints of green. All of these hues are visible on the floor and rim of Albategnius at upper left. The first thing to ask is if these subtle hues are real or artifacts of my extreme processing. One way to tell is to compare this with other color enhanced images, but I don't have any right now. Assuming this are mostly real leads to the question of what causes them. The spottiness of the reds suggest they are not a single continuous geologic unit, like lava flows in the maria, but may be caused by a spotty process, for example, splashes of material associated with secondary craters. But the spottiness seems more uniform than secondaries should be so I am left uncertain. The green on the floor of Argelander is more geologically constrained and thus looks more likely to be real. It will be intriguing to see if some future, more rigorous analysis recognizes a different composition for the floor of Argelander. What do you think?
- 04/22/2010 23:00 MEZ. Luminance: Lichtenknecker Fraunhofer Refraktor 3000 / 200,
DMK 31AF03.AS. Luminance: Lichtenknecker Fraunhofer Refractor f=3000mm /D= 200
mm, DMK 31AF03.AS + Baader Planetarium G-CCD filter. Color: C11 + Canon 40D.
Data processing: AVI Stack, Fitswork and Photoshop.
Rükl plate 56
Yesterday's LPOD: Trough Musings
Tomorrow's LPOD: The Classics