December 6, 2021
Bumps And Ridges
Originally published January 24, 2012
image by jocelyn.serot
Rümker is a strange landform. A pile of domes, mostly with very low slopes, a few a little steeper. LPOD has talked about Rümker before so this time we'll look at the mare surface here. The mare ridges overall are part of a large semi-circular arc that has been hypothesized to be an inner ring of a putative Procellarum basin. But the ridges have deviations from a pure circle. For example, near top right two ridges form a rough circle as if they mark a buried crater, but I don't think that is right. Two other ridges at top center are angled 30° or so from the main ridges. There must be a force that caused the ridges to form at that angle but we may never know what it was.
2012-01-06, 20h57 UT. T200 Newton, Barlow 3x, Astronomik IR-742 filter, PLA-Mx camera.
Rükl plate 8
Jocelyn's website (Click Plato image for a list of imaged craters)
Yesterday's LPOD: A Piece of the Moon
Tomorrow's LPOD: Mare Oreo