Ptolemaeus, Alphonsus and Arzachel
It is not always possible to obtain good quality photos from the F-3100mm focal length because everything depends on seeing. However, such a frame changes the perspective, extracts structures from the entire set of morphological forms, and gives them greater subjectivity. The shape of the shadow in Ptolemy is better visible, from which we can conclude about the line of the eastern crown of the ramparts. The morphology of the bottom of the Hipparchus and Albategnius craters located east of Ptolemy becomes more clear. Details of the Muller group (*)chain of craters (north of Ptolemy) allow us to conclude that some of them were formed simultaneously, because the walls separating them are straight sections. We identify linear structures that appear in many places and appear to be rifts, ditches, or small valleys as crater chains because their distinctive features are clearly visible.
(*) It is probably morfological north part of Catena Abulfeda, because this chain of craters lies in one line with the Abulfeda chain.
Moon 4 hours after the first quarter, May 27, 2023 at 8:50 p.m., at an altitude of 40 degrees, in rather poor conditions.
Monochromator based on the TS Individual 152/900 achromatic refractor with a Baader Hα 35nm filter, Barlow GSO 3x ED (F equivalent 3100mm), ASI290MM, EQ-ATM, FireCapture2.6, Autostakkert!3, ImPPG.
https://www.cloudyni...4833_457658.jpg
Edited by Loxley, 25 November 2023 - 08:24 AM.
