Gum 23 and Gum 22: diffuse nebulae in Vela

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    12" ASA: LRGB 12" ASA:Ha 12" ASA: HaLRGB  
    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 12" ASA astrograph. An image taken with 16" Dream Corrected Astrograph (DCA) 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 08:59:30 (h:m:s)
Center of field DE -47:29:12 (deg:m:s)
Size 57 x 42.7 (arcmin)
Pixel scale: 1.03 (arcsec/pixel)
Orientation: Up is -2.09 degrees E of N


Charts and image details obtained from
Optic(s): ASA 12" f 3,6 Astrograph (ASA)
Mount: ASA DDM85
Camera: FLI MicroLine 8300 CCD camera
Filters: Red, Green, Blue, Astrodon
Dates/Times: 11 May 2013
Location: Namibia-TIVOLI ASTROFARM, S 23° 27' 40,9" / E 18° 01' 02,2"
Exp. Details: L:6x10min, R:6x10min, G:6x10min, B:6x10min,Ha:4x15min, Bin 1
  Total Exposure Time - 300 min (5hrs)
More details: Dark and flat frames reduction,
Processing: PixInsight / PS


Copyright: Velimir Popov and Emil Ivanov 2013. All Rights Reserved
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