IWLOP #038 – Cyrillus
Cyrillus is older than Theophilus which overlaps its eastern wall, and is more eroded.
Location: 13.2 S 26-22 E Origin: Impact Size: 98 km Rukl: 46 Type: Complex Crater (CC)
Objects: Cyrillus, Mons Penck, Ibn Rushd, Kant
Observation 1:
Location: Home
Date: 2019-06-08
Time: 11:39 PM ADT
Equipment: 10" Meade SCT, 12 mm eyepiece with 90° FOV + x2 Barlow
Magnification: x416
Seeing: Very Good (4)
Transparency: Good (3)
SQM: 19.41
Temperature: 15° C - 10° C, no wind or clouds
R1: The two peaks of Cyrillus (α, η,) were slightly above centre. Theophilus cuts into the NE wall. Cyrillus crater A easily seen on its floor at the western wall.
R2: Mons Penck was next to Kant in the NW.
C1: Ibn Rushd and Kant are craters located in the NW of Cyrillus. Ibn Rushd appears shallow in comparison to Kant and Cyrillus.
C2: The third peak (δ) of Cyrillus was smaller than the other two (α and η).
Observation 2:
Location: Home
Date: 2020-05-28
Time: 10:46 PM ADT
Equipment: 6" Dobsonian, 9.7 mm eyepiece + x2 Barlow
Magnification: x250
Seeing & Transparency not recorded
C3: Observed the narrow rille on the eastern floor in June 2019, and saw again. The arcuate ridge on the eastern floor was observed in this observing session.
