Emission Nebulae and Filaments in the Field of the Vela Supernova Remnant

Ha/OIII Combination Image - Imaged from Florida, Spring, 2012





Ha/OIII combination



Data Ha/OIII Combination
Taking Camera SBIG ST-8300M Chiefland, FL ~mag 6 - no moon - Sensor @-20C
Imaging OTA Canon EF 180mm f3.5L
Equivalent focal length and ratio 180mm f3.5
Mount Losmandy G11 Gemini 2
Guiding PHD with SSAG and 80mm f5.0 Guidescope
Ha-OIII Combination 14X15' 3nm Astrodon Ha and 14X15' 3nm Astrodon OIII unbinned
Calibration and Stacking Darks, Bias and Flat Frames - PinInsight
Processed PixInsight and Adobe Photoshop CS4






This is a wide field image captured with a 180mm lens. The brighter emission feature (upper left center) is Gum 17, the fainter and larger (lower right center), Gum 14 after Australian astronomer Colin Stanley Gum (1924-1960). They are HII regions and show the characteristic red colour of hydrogen alpha emission. The filaments from the supernova are somewhat brighter in the blue-green of doubly ionised oxygen.

These objects would be better imaged from a more southern locality than north-central Florida where they reach an altitude of only 20 degrees or so elevation. That elevation means, even on the meridian, each exposure suffers the effects of passing through the equivalent of three times as much atmosphere as compared to an object at the zenith.


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