RCW 83
Emission Nebula, Centaurus
RCW 83 is an emission nebula in the southern constellation Centaurus. It appears as a rather large cloud located in the southern part of the constellation, a short angular distance from the bright star Hadar, of magnitude 0.61. Given its strongly southern declination, its observation is possible only from the regions of the southern hemisphere of the terrestrial and from the tropical ones of the northern hemisphere; From the southern hemisphere it appears circumpolar to subtropical latitudes. The most suitable period for its observation in the evening sky is from March to September.
It is an H II region of considerable extension located on the outer edge of the Sagittarius Arm at a distance of about 1500 parsecs (4900 light years); The main sources of its ionization would be two high-mass stars, the blue star HD 123590 of spectral class O7.5V and the blue giant HD 122669, of class B1III. Some star formation processes are active within it, evidenced by the presence of sources of infrared radiation, one of which is identified by IRAS (IRAS 14051-6147), while no radio wave sources are detected. This cloud and nearby RCW 85 are believed to be part of an extensive nebula complex located east of the bright Centaurus OB1 association, a large OB association placed at equal distance from the cloud that has over twenty young and massive stars of the first spectral classes and two Wolf-Rayet stars.
It is an H II region of considerable extension located on the outer edge of the Sagittarius Arm at a distance of about 1500 parsecs (4900 light years); The main sources of its ionization would be two high-mass stars, the blue star HD 123590 of spectral class O7.5V and the blue giant HD 122669, of class B1III. Some star formation processes are active within it, evidenced by the presence of sources of infrared radiation, one of which is identified by IRAS (IRAS 14051-6147), while no radio wave sources are detected. This cloud and nearby RCW 85 are believed to be part of an extensive nebula complex located east of the bright Centaurus OB1 association, a large OB association placed at equal distance from the cloud that has over twenty young and massive stars of the first spectral classes and two Wolf-Rayet stars.
Telescope: Planewave CDK17 (FR) f4.5
Mount: Astro Physics 1600GTO
Camera: QHY16200A/ Integral FW
Guider: Agena Starguide II / ZWO ASI178MM
Filters: Astronomik 36mm 5nm H-alpha
H-alpha: 83×10 mins = 830 mins
Total Imaging Time: 13h 50m
Data Imaged remotely over 2 nights during March 2023.
Imaged from Observatorio El Sauce, Chile, in partnership with Fred Espenak.
Data acquisition & Processing by David Churchill.
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