Monday, September 9, 2013
Sh2-112, processed with an additional data
I'm waiting to start imaging a new material but there are few items in factory service and I'll need to wait them to come back. Mean while I reprocessed my image of Sharpless object 112 in constellation Cygnus.
Originally I had too little exposures to reveal the background nebulous properly. I noticed, that I actually have a very deep exposures for this object but taken with very different image scale. I have shot this area with a Canon EF 200mm f1.8 optics and the background nebulous stands out very nicely there.
I have developed a new method to combine data from very different sources. It's based on signal to noise analysis, a very weak signal doesn't usually has too much details in it. The weak signal from a low resolution source can be used with a high resolution signal and best of both image types will be used in final image.
http://astroanarchy.blogspot.fi/2012/12/sharpless-112-sh2-112_5.html
Sharpless 112
An emission nebula in constellation Cygnus
The additional data is taken from this wide field image of the same object
Image in mapped colors from the light emitted by ionized elements.
Red=Sulfur, Green=Hydrogen and Blue=Oxygen.
This is a small part of a very large mosaic image of the constellation Cygnus, the mosaic can be seen HERE.
Sh2-112 is located at lower center of the image and the weak background nebulae stand out clearly. Image is shot with a very fast opticla configuration, a Canon EF 200mm f1.8 lens at full open, a cooled astronomical camera, the QHY9 and the Baader narrowband filter set. Total exposure time for this image is around 4h.
Sh2-112 in visual spectrum
Technical details:
Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Levels, curves and color combine in PS CS3.
Optics, Meade LX200 GPS 12" @ f5
Camera, QHY9
Guiding, SXV-AO, an active optics unit, and Lodestar guide camera 8Hz
Image Scale, ~0,8 arc-seconds/pixel
21 x 1200s exposures for the H-alpha, emission of ionized Hydrogen = 7h
3 x 1200s exposures for the O-III, emission of ionized Oxygen = 1h
3 x 1200s exposures for the S-II, emission of ionized Sulfur = 1h
Additional exposures for the background nebulae are shot with a very fast opticla configuration, a Canon EF 200mm f1.8 lens at full open, a cooled astronomical camera, the QHY9 and the Baader narrowband filter set. Total exposure time for this extra data is around 4h.
Additional exposures for the background nebulae are shot with a very fast opticla configuration, a Canon EF 200mm f1.8 lens at full open, a cooled astronomical camera, the QHY9 and the Baader narrowband filter set. Total exposure time for this extra data is around 4h.
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