TEC Mak Cass 250/20, Lumenera Infiinity 2-1m, Astrodon J-C UV filter and Astronomik iic R filter
2000 frames, AVIStack 2, Registax, Photoshop CS4

July 31 2010 at 2000H local time(about 15 minutes before sunset)  Alt 26 deg

This is my first attempt at UV imaging. Just about everything is against you in this setting, with
relatively low camera QE and scope light transmission (relative to what you would get with visible
light) and with even worse seeing and atmospheric distortion than for the visible blue band. I
managed to get subframes at about 24 mS which is remarkably long for Venus at mag -4.2. The
color image uses a visible light R filter for the red and green channels, and UV for the blue
channel.

Venus is a uniform cream color in visible light. In UV one still cannot see surface features, but
one can pick out differential absorption in the cloud cover.  In UV the poles are white, and the
remainder of the planet gray with darker swirls due to differing amounts of sulfur dioxide and
sulfuric acid  in its upper atmosphere.
Venus in UV
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