| 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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