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Thursday, October 22, 2015

Sharpless 112, Sh2-112, in Cygnus

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.)


Image in mapped colors from the light emitted by ionized elements. 
Red=Sulfur, Green=Hydrogen and Blue=Oxygen.

A closeup

Image in visual spectrum

Natural color composition from the emission of ionized elements. 
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 

The actual nebula is easier to observe in this starless version

Orientation in Cygnus

Part of the 18-panels mosaic image of the constellation cygnus.  Sh2-112 in a white rectangle.

Technical details

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.

Imaging optics
Celestron Edge HD 1100 @ f7 with 0,7 focal reducer for Edge HD 1100 telescope

10-micron 1000

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

Exposure times
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
Total 7h

A single uncropped, calibrated and stretched 20 min. H-alpha frame as it comes from the camera

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