still more great lunacy: theophilus and friends, ghost crater

also seen in the wider image in the previous post is this trio of craters:

Theophilus, Cyrillus and Catharina craters
 9/13/2021 02:54 UTC 

the age of these craters increases from left to right (north to south):
theophilus (left) has steep sharp terraced walls and a steep triple peaked central mountain.  

cryillus (center) has more rounded walls, with the northern interrupted by theophilus.  the central peak is also rounded and less prominent.  

catharina (right) has low rounded edges with no terracing and multiple craters interrupting/obscuring the rim.  nothing remains of the central peak.  

Lastly, can you find the "ghost crater" in this wider view (click for full size)?

ghost crater daguerre upper left
(straight up from theophilus)
almost entirely covered by lava
 9/13/2021 02:54 UTC 

ghost crater daguerre
almost entirely covered by lava
 9/13/2021 02:54 UTC 

references:
https://en.wikipedia.org/wiki/Theophilus_(crater)

https://en.wikipedia.org/wiki/Cyrillus_(crater)

https://en.wikipedia.org/wiki/Catharina_(crater)

https://en.wikipedia.org/wiki/Daguerre_(crater)

Image details:
camera ZWO ASI 290MM 
filters: ZWO IR pass 850 
(seeing was mediocre with the 850 filter clearly sharper than a Baader IR pass "685")
celestron 11" Edge HD, no barlow
East Bluff, CA
9/13/21 02:43-03:02 UTC
moon waxing crescent 6.6 day old
FPS (avg.)=73
Shutter=12ms
Gain=251 (41%)

more lunacy, rupes altai

here's the feature that helped me identify the crater in the previous post:

rupes altai 9/13/2021 02:54 UTC 

the distinctive curved white line is called rupes altai, a ridge that can be best seen in the lunar morning with the sun shining on it's face (5 days after the new moon), or in the lunar evening with it casting shadows (4 days after the full moon).

nearly 500 km long and 3 to 4 km high, it's the rim of a gigantic impact basin (mare nectaris-smooth area upper left in image below)

it terminates on the right hand side at the crater piccolomini

a wider view (click on image for full size):

rupes altai, lower right 9/13/2021 02:54 UTC 

rupes altai, rim of giant impact basin
mare nectaris

Refs:
wikipedia
LPOD

Andrew Planck BLOG

Image details:

camera ZWO ASI 290MM 
filters: ZWO IR pass 850 
(seeing was mediocre with the 850 filter clearly sharper than a Baader IR pass "685")
celestron 11" Edge HD, no barlow
East Bluff, CA
9/13/21 02:43-03:02 UTC

moon waxing crescent 6.6 day old
FPS (avg.)=73
Shutter=12ms
Gain=251 (41%)