Horsehead Nebula, B33 in IC 434 Ha Narrowband
Copyright 2011
Larry Phillips
Horsehead Nebula (B33) in the constellation Orion using only a narrowband Ha filter. The nebula in the lower left is NGC 2023 and the nebulosity behind the horsehead is IC 434. Note the stripes in the upper background not usually visible when imaged in normal light.

Distance: 1500 light years.
Size: N/A
Camera: SBIG ST-2000XM
Telescope: Astrophysics Starfire 140 EDT F7.5
Mount: Astro-Physics Mach1 GTO with Advanced Telescope Systems portable pier
Images: Exposure was 18 sub images @ 15 minutes of Ha filter for a total exposure time of 2 hours and
                 30 minutes.
Date: March 2009
Software: Camera, mount, and guider control - CCD Commander & MaximDL, calibration and stacking - CCDStack, further processing in Photoshop CS4.