May 15, 2018
Originally published January 13, 2009
image by Jocelyn Sérot, Clermont-Ferrand, France
The Moon's northwest limb is infrequently imaged, making it all the more interesting when a good shot comes in. Here we see not one, but two views of the western edge of Oceanus Procellaurm, with a difference of almost three hours between them. The large crater near the terminator is Eddington, and the bright one in the mare in front of it is Seleucus. In the earlier view (right), a long unnamed mare ridge can be seen along the entire length of of the image, passing near Briggs at the top, being squashed by the Seleucus impact, and weakening as it aims toward Cardanus (bottom left). From Seleucus south a ray of disputed origin covers the ridge. Roughness on the floor of Eddington would never be interpreted as the small rille that actually exists there. With the higher Sun (left), the floor and central peak of Seleucus see the light of day for the first time in 14 cold days, and the northeasterm rim peaks of Eddington seem less dramatic.
Right: Jan 9th 2009 at 20h13 UT; Left: 23h UT. Mewlon 210, prime focus + DMK 31AF03 camera + IR-block filter; 15 FPS, 1/23 exp, 180 images stacked out of 1000; wavelet processing on Registax.
Rükl plate 17
Yesterday's LPOD: Zupiddy Do Da
Tomorrow's LPOD: A Little Bit of Mystery