IWLOP #022 – Janssen

Large crater with a 140 km system of rilles on its floor.

Location: 44.9 S 41.0 E     Origin: Impact      Size: 250 km      Rukl: 68, 67     Type: Simple Crater (CS)

Objects: Janssen, Lockyer
Others Identified: Fabricus, Janssen A, Metius, Rimae Janssen, Steinheil, Watt, Janssen craters T, D, F, S, E, R, M, J, C, X

Location: Home
Date: 2021-05-16
Time: 9:25 PM ADT
Equipment: 10" Meade SCT
Eyepiece: Explore Scientific 4.7mm with 82° FOV + x2 Barlow

Magnification: x1060
Seeing: Excellent (5) 
Transparency: Very Good (4) 

R1: There were several secondary craters on the Janssen floor. Fabricus interrupts its N-NE landscape and Lockyer interrupts it in the SW. The rim appears pockmarked with small craters.

C1: There was a rille from Fabricus that cut through the central peak, headed south and split east of Lockyer. There was a hint of a northern part that entered Fabricus and then passed between Fabricus and Janssen A, but not sure.

  

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