IWLOP #033 – Posidonius

Flooded crater from the Upper Imbrian Era. The interior ring is higher than the lunar mean surface in the eastern portion. It has very irregular terrain. There are 5 separate rimae within Posidonius; these possibly happen when a large impact occurs on the edge of an already fractured basin.

Location: 31.8 N 29.9 E   Origin: Impact    Size: 95 km    Rukl: 14     Type: Complex Crater (CC)

Objects: Posidonius, Posidonius A, Chacornac, Chacornac A
Others Identified: Daniell, Luther, Le Monnier, Posidonius craters B, D, J, M, O, P

Location: Home
Date: 2019-04-11
Time: 11:21 PM ADT
Equipment: 10" Meade SCT, 10 mm eyepiece + x2 Barlow
Magnification: x1060
Seeing: Very Good (4)
Transparency: Excellent (5)   

R1:  Posidonius had one large hill on its floor along with what appeared to be ridges or smaller hills. Round and deep Posidonius A was just west of centre.
R2: Chacronac appeared shallow compared to Posidonius. Its NW crater wall appears non-existent except for Posidonius' crater ridge.

C1: I found two of the rimae within Posidonius, one running NW to SW and one running NE to SW.
C2: Chacornac A is almost centred in the crater. Very small and shallow. Had to stare for a period of time before it appeared.

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