Try increasing gamma if dark sections aren't distinguished

Try increasing gamma if dark sections aren't distinguished

Monday, December 20, 2021

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%)

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