http://gallery.cuttinedgeobservatory.com/v/nebulae/ic1805/ The very brightest part of this nebula (the knot at the right) is separately classified as NGC 896, because it was the first part of this nebula to be discovered.
The nebula's intense red output and its configuration are driven by the radiation emanating from a small group of stars near the nebula's center. This open cluster of stars known as Melotte 15 contains a few bright stars nearly 50 times the mass of our Sun, and many more dim stars that are only a fraction of our Sun's mass. The cluster used to contain a microquasar that was expelled millions of years ago.]]> en-us Gallery 2 RSS Module, version 1.1.8 Wed, 22 Apr 2026 13:17:52 +0000 120 http://gallery.cuttinedgeobservatory.com/d/1100-4/ic1805.jpg http://gallery.cuttinedgeobservatory.com/v/nebulae/ic1805/ http://gallery.cuttinedgeobservatory.com/v/nebulae/ic1805/IC1805_HaL_HaR_GB.jpg.html http://gallery.cuttinedgeobservatory.com/v/nebulae/ic1805/IC1805_HaL_HaR_GB.jpg.html
Exposure
- HaLRGB 270:30:15:15:15
- L 10min subs @ bin1x1
- RGB 5min subs @ bin2x2
- Ha 30min subs @ bin1x1
- 5.65 hours total exposure

Equipment Used
- Tele Vue NP-127is
- SBIG STL-11000M
- Paramount ME
- Astrodon Gen 2 Filters

Processing in CCDStack

Final processing Photoshop CS4

Red Channel is 80/20% H-alpha/Red blend
Lum Channel is Ha/Red Blend @ 30% opacity]]> Chris Johnson photo Mon, 22 Dec 2008 20:43:59 +0000 http://gallery.cuttinedgeobservatory.com/v/nebulae/ic1805/IC1805_Ha.jpg.html http://gallery.cuttinedgeobservatory.com/v/nebulae/ic1805/IC1805_Ha.jpg.html
Exposure
- Ha 270min
- Ha 30min subs @ bin1x1
- 4.5 hours total exposure

Equipment Used
- Tele Vue NP-127is
- SBIG STL-11000M
- Paramount ME
- Astrodon Gen 2 Filters

Processing in CCDStack

Final processing Photoshop CS4]]> Chris Johnson photo Wed, 24 Dec 2008 00:41:56 +0000