Gum 23 and Gum 22: diffuse nebulae in Vela

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    16" DCA: LHaRGB 16" DCA: LHaRGB-annotated 16" DCA: Ha  
    Size: 2000 px Size: 2000 px Size: 2000 px  
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© Velimir Popov & Emil Ivanov 2013

Gum 23 , also known as RCW 38, is a diffuse nebula visible in the constellation Vela. You can spot it about halfway between the stars λ and δ Velorum , in an area of ​​sky full of very dense star fields and other nebulae , including the famous Vela nebula. It is an HII region in which is active and vigorous the phenomenon of star formation , as evidenced by the strong infrared emission ; in the inner regions , in a diameter of 5 light years , there are a thousand hot young stars , gathered in an open cluster in formation. The X-ray emission indicates the presence of a strong magnetic field , probably produced by a supernova explosion occurred within the cluster. Although direct evidence of the explosion has been observed only thousands of years ago, the shock wave produced by the explosion could be responsible for the electronic excitation. The distance of the complex is estimated at 5500 light years.

Gum 22 (RCW 38a) is the bright nebula surrounding the O5.5V star RCW 38 IRS 2 at the core of the Gum 23 (RCW 38 ).

This is an image taken with 16" Dream Corrected Astrograph (DCA). An image taken with 12" ASA astrograph can be seen here

Object details

Right Ascension 08:59:19 (h:m:s)
Declination -47:30:22 (deg:m:s)
Distance ~ 5.5 (кly)
Apparent Dimension 20 x 20 (arc min)

Image details



Center of field RA 08:59:27 (h:m:s)
Center of field DE -47:30:19 (deg:m:s)
Size 1.39 x 1.39 (deg)
Pixel scale: 1.23 (arcsec/pixel)
Orientation: Up is -178 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: From 3 to17 of May 2013
Location: Namibia-TIVOLI ASTROFARM, S 23° 27' 40,9" / E 18° 01' 02,2"
Exp. Details: Ha: 10x15min, L: 1x10min, R: 1x10min, G: 1x10min, B: 1x10min, Bin 1
  Total Exposure Time - 190 min (3:10 hours)
More details: Dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2013. All Rights Reserved
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