NGC 3199

NGC 3199

Bubble Nebula in Carina

Constellation: Carina
Ra: 10h 16m 48s
Dec: -57d 57m 0s
Distance: 12,000 light years
Image Size: 32' x 32'
North: Up and Right



NGC 3199 (RCW 48) is a bright, 20’ crescent-shaped nebula in the southern constellation of Carina about 12,000 light years distant.  Deeper images, as presented above, show the bright crescent to be part of a larger elliptical bubble.  It is referred to as a ring nebula and is associated with a galactic Wolf-Rayet star (HD 89358), which is not at the center of the bubble (see smaller image below). This could suggest that the WR star has moved since the nebula was formed.   It resides in a diffuse HII region as shown by the faint background nebulosity. This image was taken with 25 hours of exposures using narrowband filters for high contrast to bring out the faint structures in the nebula.  The narrowband data were mapped to “natural” colors.   North is up and to the right and the image size is about 32’.  Some references are:

Dyson and Ghanbari, , Astron. Astrophys. 226, 270-277, 1989
Whitehead, Meaburn and Goudis, Astron. Astrophys. 196, 261-265, 1988)


Exposure: 26.25 hrs Total; 8,6, 11 hrs H-a, SII, OIII 75 min RGB
Telescope: PlaneWave CDK 0.5m f/6.8
Mount: PlaneWave Ascension A200h
Oag: Astrodon MonsterMOAG
Acquisition: CCDAutoPilot5
Calibration: CCDStack2
Observatory Site: Siding Spring, NSW, Australia
Camera: SBIG STX16803
Filters: Astrodon 3nm OIII, SII, 5 nm H-a, Gen 2 RGB
Guider: SX Lodestar
Camera Operation: MaximDL 5.24
Processing: Photoshop CC 2014, PixInsight Ripley
Image Date: 02/17/2015 - 03/04/2015

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