Try increasing gamma if dark sections aren't distinguished

Try increasing gamma if dark sections aren't distinguished

Sunday, December 8, 2019

clouds on uranus

what better follow up to methane on jupiter than clouds on uranus? 

prior blog entry: "there's not much to see visually.  bluish-green, it can be seen with the unaided eye in dark locations.  At high power it can be seen as a small disk rather than a dot.  A monster telescope or camera might detect several moons, and possibly faint cloud formations..."

to my surprise, an IR filter was able to bring out cloud cover on the upper half:
Uranus IR-RGB 10/27/2018 08:52 UTC
have to try a methane filter on this one ;)



Imaging details:
camera ZWO ASI 290MM with ZWO RGB filters
Baader IR pass 685 nm, Astronomik IR pass 807 nm
celestron 11" Edge HD
East Bluff, CA
10/27/18 8:52 UTC
120 second captures, 2x each filter (only one for IR 685)
gain 456 , exposure ~13 ms red, 4 ms green, 6 ms blue, 130 ms IR 807 30% histogram
upsampled x2 in autostakkert, derotated in winjupos.
color balance eyeballed ;)
(actually set the white point to the clouds)


here's the straight RGB for the purists:
Uranus RGB 10/27/2018 08:52 UTC


References:
interesting articles by Christophe Pellier on the spectrum of uranus and implications for IR filters:
https://www.planetary-astronomy-and-imaging.com/en/uranus-spectrum-commented
https://www.planetary-astronomy-and-imaging.com/en/filters-uranus-spectroscopy



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