Instrument

Takahashi FSQ-106ED @ f/5.0 (530 mm F.L.)  Captured at 3.5 arcsec/pixel.  Shown resampled to 15.4 arcsec/pixel.

Mount

Paramount ME

Camera

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

Acquisition Data

12/11/2008 Chino Valley... with CCDAutoPilot3

Exposure

Ha   240 min. (8 x 30 min. bin 1x1)   6 nm filter
Click here for the color version

Software

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

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

PhotoShop for non-linear stretching.

Comment

North is to the left.

The Horsehead Nebula is one of the most famous nebulae, about 1500 light years away, in the constellation of Orion. Although difficult to see, even with a large back yard telescope, the nebula is truly spectacular when imaged with a CCD camera. The horse head feature is actually a dark nebula, of opaque dust, also cataloged as Bernard 33 or B33. The horse head is actually located in front of the background hydrogen cloud.

The bright area, at the lower left, is the Flame Nebula.