Uranus w/cloud bands
Taken by Richard Schrantz on September 27, 2013 @ Nicholasville, KY
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Imaged Uranus in R+IR (>610 nm filter) under superb seeing. I was able to show cloud bands. Currently, Uranus exhibits cloud bands in IR light (unlike when Voyager imaged). 10-inch reflector at f/30. 1/4 second frame rate. Best 1800 of 2300 frames. I needed to record more frames, and a bigger scope would help too!
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uranus atmosphere is 85% hydrogen. You might want to use a very high transmission hydrogen alpha filter to pick up the details you seek. I recommend anything with a sputtered coating. This will result in transmission greater than 85%, and narrow band.
http://www.edmundoptics.com/optics/optical-filters/bandpass-filters/hard-coated-od4-10nm-bandpass-filters/65171
Posted by amplelight 2013-10-03 17:25:27
Hi Amplelight,
Thanks for the comment. Uranus is a blue-green world. As such it emits relatively little red and IR light. It also has a low surface brightness due to its distance from the sun. Even using a very red and IR sensitive planetary camera, and a filter that transmits all red and IR light, I had to use very long 1/4 second frame exposure for the avi image file. That is a very long exposure per frame at those high magnifications. An h-alpha filter has such a narrow bandpass that very little light from Uranus would get through to the CCD chip. This Uranus cloud band recording technique is being used at the Pic-du-Midi observatory and other top amateurs to image Uranus cloud detail.
Posted by rnschrantz 2013-10-03 18:07:39
 
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