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Catalogue and alternative designations RCW 71, Gum 46, Bran 397


Type Emission Nebula 
Position 12 50 23, -61 35 01
Constellation Crux
Camera and Telescope STXL6303 and 36.8 cm RCOS Ritchey Chretien 
Focal Ratio F9
Exposure Details HaLRGB image using Astrodon filters.  Hydrogen Alpha = 420 minutes, Luminance = 100 minutes, Red = Green = 120 minutes, Blue = 150 minutes.  All exposures unbinned.
Description RCW 71 is a small faint emission nebula behind the Coalsack in the southern cross and appears strongly reddened because of this.  It's about 2 arcminutes across and is excited by the 11th magnitude star HD311999.  The RCW catalogue was prepared by Rogers, Campbell and Whiteoak under the direction of Bart Bok in 1960