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Monday, March 15, 2010

Abell 21, Sh2-274, the "Medusa Nebula", Start of the new project.





 
The Medusa Nebula in Gemini is also known as Abell 21 and Sharpless 274. It's a large nebula as a planetary one, due that the surface brightness is very low, between 15.99 to 25.
Ones again, this target is very low for me, at highest elevation in South, it was about 35 degrees and after a three hours, the altitude was only a 25 degrees.
I managed to get only one 20min frame of O-III, binned 3x3,  but there was some signal, so I was able to make the "preview" image as a color one. (Red=H-a, Green=O-III and Blue=80%O-III + 20%H-a)

I'll continue with this target as soon as the weather cooperates againg.

Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack.
Levels, curves and color combine in PS CS3.

Telescope, Meade LX200 GPS 12" @ f5
Camera, QHY9 Guiding, SXV-AO @ 10Hz
Image Scale, 0,75 arcseconds/pixel
Exposures H-alpha 8x1200s, binned 1x1, O-III 1x1200s, binned 3x3.

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