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The Gum Nebula Complex and the Vela SNR, Vela/Puppis Named after Colin Gum, a late Australian astronomer, the Gum Nebula (Gum 12) is an emission region so large and close that it is actually very hard to see. Covering over 40° of the sky, it has a diameter of 1100 ly in with its front edge 450 ly from our solar system. It is believed to be a still expanding remnant (or remnants) of one, or more, supernovae that exploded millions of years ago. Also visible is the much younger supernova remnant, the Vela SNR, visible as the turquoise and red filaments (containing the degenerate core of the dead star, the Vela pulsar) to right of centre. Just below are two other objects from Gum's catalogue, Gum 17 and Gum 15. Canopus is the bright star upper left. ASV Crux Astrophotography Award winner 2014
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| Camera: | SBIG STL11000M; Astrodon filters | Scope: | 35mm f3.5 lens at f4 (fov ~55°x40°) |
| Mount: | Synta NEQ-6 mount tracking the sky | Guiding: | none |
| Filters/Exposures: | Ha:OIII: 111:400 min (bin 1x1); HOO mapped as RGB, 8h 30m total exposure time | Location: | Astronomical Society of Victoria, Leon Mow Dark Sky Site, Heathcote, Victoria |
| Dates: | January and March 2013 | Processing: | CCDStack2, RegiStar and Photoshop CS5 |