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Thursday, October 22, 2015
Sharpless 112 is not a very commonly imaged target since the constellation Cygnus has so many eye catchers around. I shot this object at 29.9. but got it processed just now. There is an other Sharpless catalog object just few degrees from Sharpless 112, the Sh2-115. (I shot the Sharpless115 about a year ago, it can be seen HERE.)
Red=Sulfur, Green=Hydrogen and Blue=Oxygen.
Image in visual spectrum
This palette is very close to a visual spectrum.
Sharpless 112, Sh2-112, locates in constellation Cygnus at distance of about 6000 light years. My photo spans about one square degrees of sky. An apparent size of Sh2-112 is about 50% of the full Moon's angular size.
An experimental starless image
Orientation in Cygnus
Part of the 18-panels mosaic image of the constellation cygnus. Sh2-112 in a white rectangle.
Processing work flow
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 21 iterations, added at 25% weight
Color combine in PS CS3
Levels and curves in PS CS3.
Celestron Edge HD 1100 @ f7 with 0,7 focal reducer for Edge HD 1100 telescope
Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x2 and SXV-AOL
Astrodon filter, 5nm H-alpha
Astrodon filter, 3nm O-III
Astrodon filter, 3nm S-II
H-alpha, 10 x 1200s = 3h 20min.
O-III, 4 x 1200s binned = 1h 20min.
S-II, 4 x 1200s binned = 1h 20min.
RGB for stars, 20min. each
A single uncropped, calibrated and stretched 20 min. H-alpha frame as it comes from the camera