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Horsehead Nebula B33   © Ken Crawford      Rancho Del Sol Observatory  MPC G67
Image Exposure Details
Filter Exposures
Clear/ Lum 270 minutes
Red 90 minutes
Green 90 minutes
Blue 90 minutes
Ha 5nm 480 minutes
OIII 3nm 900 minutes
SII 5nm 360 minutes
Horsehead nebula and NGC2023 in Orion (B33). B33-1 is the little yellow patch on the brow on the "head" area. The red knots below the neck area are known as Herbig-Haro objects and are believed to be stars in the early stages of formation.
RCOS 20" carbon truss - 100mm FFC
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NGC2023 shows ionization fronts laced with gas and dust.

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Combined Ha, Lum, and RGB data.