GUM 10 aka RCW 19

EMISSION NEBULA REGION IN PUPPIS  (THE POOP DECK)

(Image centered at: ra 08 h:16 m / dec - 35º 50')

November - 2024, Home Backyard in Martinez, Buenos Aires, Argentina

DATA

TYPE: Emission Nebula Region

APPARENT DIAMETER: less than 1 degree

APPARENT MAGNITUDE (V): n/a

DISTANCE: 10.800 light years (3300 parsecs)

IMAGE INFORMATION

INSTRUMENT: 6" ORION OPTICS UK (Ultra Grade Optics) w/Sky Watcher Coma Corrector (0.9x) working at at f4.5

CAMERA: QHY 183 MONO

MOUNT: VIXEN GDPX, OAG with Starlight Xpress Lodestar

FILTERS: BAADER LRGB Set ANTLIA & HA 3nm

SKY CONDITIONS: urban skies - Bortle 8

EXPOSURES: LHARGB (45,70,45,45,45)

OBJECT DESCRIPTION AND IMAGE SESSION

Gum 10 or RCW 19 is part of a 200 thousand solar mass giant molecular cloud related to the Pup OB3 association and the O7f III giant star HD 69464 (the bluish star in the middle low side of the image). This photograph shows the bright rim of the larger RCW 19 complex. Not visible in the image and part of the OB3 association is Gum 11 which is a deal fainter. It should be to de upper right corner.

The image was acquired in a full Moon night and I've set the QHY 183 M a bit more than the unity gain for all filters. Does not seems to have lost dynamic range despite the short full well of the camera.

Colin Stanley Gum was an Australian astronomer (1924 - 1960). He catalogued emission nebulas of the southern skies from the Mount Stromlo Observatory using wide field photography. Gum published his findings in 1955 in a study entitled A study of diffuse southern H-alpha nebulae which presented a catalog, now known as the Gum catalog, of 85 nebulae or nebular complexes.