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Dark and Reflection Nebulae B26 and vdB31
Image at
http://home.att.net/~dpersyk/new.htm Barnard dark nebulae are dark patches of sky with dense dust clouds which obscure the stars behind the clouds. Early astronomers thought these were merely areas devoid of stars but Barnard taught otherwise. The most famous and often photographed dark nebula is B33, the Horsehead. While processing my B26 images I noticed a considerable luminosity surrounding AB Aurigae, the bright 7.1 magnitude star just left of center. At first I thought the luminosity was an artifact – internal scatter in the scope optics from the bright star. Upon further investigation I found that I had captured the van den Berg 31 reflection nebula. Nebula vdB 31 is reportedly a tough visual target with an 18-inch scope, although I found one brave sole on the web who claimed to have seen it in a 12-inch scope. It is an interesting imaging subject. I imaged it with a 4-inch refractor and MX716 CCD camera combining 9 unguided exposures of 5 minutes each. Clear skies, Dennis Persyk Igloo Observatory Home Page http://dpersyk.home.att.net Hampshire, IL |
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