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Thursday, October 7, 2010

M57, the "Ring Nebula", project finalized

A narrow band and broad band luminance mix image of the M57 as a bi color, H-alpha & O-III, composition.Not too commonly imaged outer halo structure can be seen in an image. There is least two layers of it, outer one is faintly seen in this image. A clear O-III signal is visible in a first layer of outer halo.
The halo was clear in H-alpha channel and there was some hints of it in luminance one.

Ring Nebula, M57, NGC 6822, locates in constellation Lyra, near a very bright star Vega. This planetary nebula lays about 2300 light years away from the Earth and has a diameter of 1,3 light years.
The small angular diameter, 230" x 230", makes this target difficult to image. The central white dwarf of planetary nebula nucleus is seen in an image as a Bluish dim star, visual magnitude is 15,75. Star was visible only in O-III channel and luminance channel.

A closeup

Less compressed image in my Portfolio:

Technical details:

Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack.
Deconvolution with a CCDSharp, 30 iterations.
Levels, curves and color combine in PS CS3.

Telescope, Meade LX200 GPS 12" @ f5
Camera, QHY9 Guiding, SXV-AO @ 8,5Hz
Image Scale, 0,75 arcseconds/pixel
Exposures H-alpha 9x1200s, binned 1x1
O-III 3x1200s, binned 1x1
Luminance, IDAS LP-filter 9 x 600s, binned 1x1

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