Jim Burnell's CCD Images - Abell 21
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Abell 21
Object: Abell21
The Medusa Nebula
 Const.: Gemini
Camera: ST-10 Scope: Tele Vue NP-101 Mount: AP1200
Filter(s): Hα:R:G:B Exposure: 5x8m:5x8m:5x8m:5x8m Mezatenango, Guatemala
Abell 21 (a.k.a. SH2-274) - The Medusa Nebula, a planetary nebula in Gemini. This image is a color composite consisting of a stack of 5 eight minute exposures for the luminance channel and each of the color channels. A Hydrogen-α filter was used for acquiring the exposures for the luminance channel. The images were acquired using an SBIG ST-10 CCD camera through a Tele Vue NP-101 101mm f/5.4 refractor. The exposures were stacked and a Sigmoid Scaling of the luminance channel was performed. The colors were joined and automatically balanced using AIP4WIN V2.2.0. This image has been resampled from its original size of 2184x1472.
 
Abell 21
Object: Abell21
The Medusa Nebula
 Const.: Gemini
Camera: ST-10 Scope: Tele Vue NP-101 Mount: AP1200
Filter(s): Hα Exposure: 5x8m Mezatenango, Guatemala
Abell 21 (a.k.a. SH2-274) - The Medusa Nebula, a planetary nebula in Gemini. This image is a stack of 5 eight minute exposures taken through a Hydrogen-α filter. The images were acquired using an SBIG ST-10 CCD camera through a Tele Vue NP-101 101mm f/5.4 refractor. The exposures were stacked and a Sigmoid Scaling was performed using AIP4WIN V2.2.0. This image has been resampled from its original size of 2184x1472. This image was used for the luminance channel of the color image above.