Friday, April 3, 2015
NGC 1491
I shot the data for this dim object at 16. March but the processing of it ready now. I found this as a difficult target due to a very low surface brightness of the surrounding nebula. The central part is bright and it makes difficult to balance image nicely.
Click for a large image
Click for a large image
INFO
NGC 1491 is an emission nebula at the constellation Perseus. The distance from the Earth is about 11.000 light years. In the bright area, at a center of the photo, a strong stellar wind from a star BD +50 ° 886 is blowing the gas away. The radiation from the same star makes the gas glow by ionizing elements in the nebula.
Image in mapped colors
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A wider field version in mapped colors
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Image in light of an ionized hydrogen, H-alpha, only
Orientation in an older wide field photo of the area
Technical details
Processing work flow
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% 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
Mount
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, 15 x 1200s = 5h
O-III, 6 x 1200s binned 4x4 = 2h min.
S-II, 6 x 1200s binned 4x4 = 2h min.
Total 9h
A single un cropped, calibrated and stretched 20 min. H-alpha frame as it comes from the camera
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Not much can be seen in this single 20min. exposure of the emission of hydrogen, H-alpha.
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1 comment:
Beautiful work. It is technical and patient people like yourself that help us understand our universe and that is a good thing.
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