NGC 3199 (Gum 28, RCW 48, Smile Nebula) in Carina

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  16" DCA: HaRGB 16" DCA: Annotation map 16" DCA: LRGB 16" DCA: Ha  
  Size: 2000 px Size: 2000 px Size: 2000 px Size: 2000 px  
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© Velimir Popov & Emil Ivanov 2013

Hanging out some 11 736 light years away in the southern constellation of Carina, NGC 3199 is classed as a diffuse nebula embedded with a Wolf-Rayet star. Near the center of the ring is a Wolf-Rayet star, a massive, hot, short-lived star that generates an intense stellar wind. The nebula is about 75 light-years across.

The Wolf-Rayet nebula NGC 3199 has a highly asymmetric morphology, with a very bright hemisphere near the exciting star HD 89358 and a much fainter and more extended other hemisphere. This nebula is modeled in terms of the distorted bubble produced by a moving star blowing a strong stellar wind into a surrounding uniform interstellar medium. This model is fitted to the morphology and observed kinematic data. The exciting star appears to be moving at about 60 km/s into local interstellar gas of density of about 10/cu cm, and has a mass-loss rate of about 0.000027 solar mass/yr. This latter mass-loss rate is in excellent agreement with observed mass-loss rates from Wolf-Rayet stars.

Brief adapted information: The Wolf-Rayet nebula NGC 3199 - an interstellar snow plough? (Dyson, J. E.; Ghanbari, J.)

Object details

Right Ascension 10:16:33 (h:m:s)
Declination -57:56:02 (deg:m:s)
Distance ~ 11 736 (ly)
Apparent Dimension 22 (arc min)

Image details


Center of field RA 10:20:04 (h:m:s)
Center of field DE -57:51:28 (deg:m:s)
Size 1.37 x 1.37 (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: L:3x10min, R:3x10min, G:3x10min, B:3x10min, Ha:4x15min
  Bin 1, Total Exposure Time -180 min (3:00 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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