Hemisphere:  Southern  ·  Constellation: Canis Major (CMa)  ·  Contains:  The star ο1CMa

Image of the day 02/13/2014

    Sharpless 2-308, 


    Sharpless 2-308
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    Sharpless 2-308

    Technical card

    Imaging telescopes or lenses: ASA N12

    Imaging cameras: SBIG STT 8300M

    Mounts: Paramount MX

    Guiding telescopes or lenses: ASA N12

    Guiding cameras: SBIG STT 8300M

    Software: Software Bisque The Sky X Pro  ·  Photoshop CS5  ·  CCDStack 2+

    Filters: Baader Planetariun LRGB Ha - O3 - S2 38mm

    Accessory: SBIG CFW8G

    Dates:Feb. 10, 2014

    Frames: 31x900"

    Integration: 7.8 hours

    Avg. Moon age: 10.74 days

    Avg. Moon phase: 82.77%

    Basic astrometry details

    Astrometry.net job: 179564

    RA center: 6h 54' 27"

    DEC center: -23° 59' 45"

    Orientation: 92.743 degrees

    Field radius: 0.598 degrees

    Resolution: 620x482

    Locations: Home Observatory, Werribee, Victoria, Australia


    Blown by fast winds from a hot, massive star, this cosmic bubble is huge. Cataloged as Sharpless 308 it lies some 5,200 light-years away in the constellation Canis Major and covers over 2/3 degree on the sky (compared with 1/2 degree for the Full Moon). That corresponds to a diameter of 60 light-years at its estimated distance. The massive star itself, a Wolf-Rayet star, is the bright one near the center of the nebula. Wolf-Rayet stars have over 20 times the mass of the Sun and are thought to be in a brief, pre-supernova phase of massive star evolution. Fast winds from this Wolf-Rayet star create the bubble-shaped nebula as they sweep up slower moving material from an earlier phase of evolution. The windblown nebula has an age of about 70,000 years. Relatively faint emission captured in the expansive image is dominated by the glow of ionized oxygen atoms mapped to bluish hues. Text from APOD



      Sharpless 2-308, 


    • Final
      Sharpless 2-308, 



    Sky plot

    Sky plot


    Sharpless 2-308,