Gum 51 - emission nebula in Norma

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  16" DCA: HaLRGB 16" DCA: LRGB 16" DCA: Ha    
  Size: 2000 px Size: 2000 px Size: 2000 px    
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© Velimir Popov & Emil Ivanov 2016

Gum 51 (Also catalogud as RCW 105) is an emission nebula in constellation Norma. The nebula is surrounded by numerous small molecular clouds and is likely embedded in the compact OB association R105. An estimated distance for the R105 association is about 1580 parsecs and its age is 12.8 million years. More detailed image of the same object, taken with thze 12" ASA Astrograph can be found here .

Object details

Right Ascension 16 46 50 (h:m:s)
Declination -41 13 54 (deg:m:s)
Distance ~ 5 500 (ly)
Apparent Dimension - (arc min)

Image details



Center of field RA 16:10:30 (h:m:s)
Center of field DE -49:00:13 (deg:m:s)
Size 1.37 x 1.37 (deg)
Pixel scale: 1.23 (arcsec/pixel)
Orientation: Up is 179 degrees E of N
Charts and image details obtained from
Optic(s): 16" f3,75 Dream Corrected Astrograph (DCA)
Mount: Astelco NTM-500 direct drive mount
Camera: Apogee Alta U-16M CCD camera
Filters: Lum, Red, Green, Blue, Ha, OIII and SII Astrodon
Dates/Times: 30 Aug. 2014
Location: Namibia-TIVOLI ASTROFARM, S 23° 27' 40,9" / E 18° 01' 02,2"
Exp. Details: Ha: 6x15min, L: 3x10min, R: 3x10min, G: 3x10min, B: 3x10min, Bin 1
  Total Exposure Time - 210 min (3:30 hours)
More details: Dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2016. All Rights Reserved
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