Instrument

Takahashi FSQ-106ED @ f/5.0 (530 mm F.L.)  Captured at 3.5 arcsec/pixel.  Shown resampled to 16.8 arcsec/pixel.

Mount

Paramount ME

Camera

SBIG STL-11000 w/ internal filter wheel, AstroDon Filters

Acquisition Data

9/4/2008 to 10/1/2008 Chino Valley... with CCDAutoPilot3

Exposure

Green   60 min. ( 6 x 10 min. bin 1x1)

Blue     60 min. ( 6 x 10 min. bin 1x1)

Hα      270 min. (18 x 15 min. bin 1x1)

Software

CCDSoft, CCDStack, Photoshop CS w/ the Fits Liberator plugin and Noel Carboni's actions.

CCDStack to calibrate, register, normalize, data reject & combine.

PhotoShop for non-linear stretching and the color combine.

Comment

North is to the right.

NGC 7822 aka SH2-171 is an irregular emission nebula in the constellation Cepheus. Other than providing data for the star colors, the green and blue filtered data didn't add much to the image. The region is mostly hydrogen, which was captured with the Hα filter and mapped to the red channel. This gives a result that is fairly close to a true RGB image.