The red emission nebula is known as IC 434. The Horsehead nebula is Bernard 33 (B33) and is a dark nebula, that is, dust in the foreground, blocking the red emission nebula in the background. The blue halos around the bright stars are reflections inside the telescope. The white near the bottom center is a magnitude 2.0 star just off the picture – it is easily visible to the naked eye and would make a mess of the picture, so I put it off the edge. This nebula is about 1,500 light years away.
Camera: SBIG ST-10XME
Filters: Astrodon LRGB
Dates: February 4,8, 2008
Exposure: LRGB: L=24x2.5min, RGB=2.5min each, 32B, 23G, 28R for 267.5 minutes (4.6 hours) total at -25C