IWLOP #111 - Hortensius & Hortensius Domes

A fine sharp-rimmed crater (2860m deep) with a fascinating group of domes nearby. The domes are quite obvious under the right lighting conditions, but are elusive at other times.

Location: 7.0 N 28.0 W    Origin: Impact and Volcanism     Size: 14.6 km (Hortensius) and various domes   Rukl: 30     Type: Simple Crater (CS) and Domes

Objects: Hortensius, Hortensius Domes, Mare Insularum ("Sea of Isles")
Others Identified: Copernicus, Milichius, T. Mayer, T. Mayer A

Location: Home
Date: 2021-06-20, 2 days after 1st Quarter
Time: 11:07 PM ADT
Equipment: 10” Meade SCT, 4.7 mm eyepiece
Magnification: x530
Seeing: Excellent (5)
Transparency: Very Good (4)
Temperature: 18° C

R1: Hortensius is circular; its floor was in shadow. The west wall was very bright. Could barely see the 5 domes; they were noticed because of the slight darkening on the shadow side. 
R2:  Mare Insularum featured many island-like highlands. A group between the domes and Copernicus looked like they formed partial walls of a ghost crater with a slightly darker floor than the area outside its 'rim'.

C1: Could not see the summit craters on the Hortensius Domes in this session.


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