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Kfir Simon | all galleries >> Galleries >> narrowband > Sharpless - 308 in Canis Major
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Sharpless - 308 in Canis Major

Sharpless 2-308 or RCW 11 is a large, faint ring nebula surrounding a Wolf-Rayet star (WR 6) in Canis Major.
WR6 is the bright, blue star near the center of the image and has been the subject of considerable research.
The large yellow star is Omicron 1 CM. The nebula has an age of 70,000 years and an expansion velocity of 60 km/s.
It is one of the closest WR stars to our solar system.
The bubble is large, taking up nearly 3/4 deg in this image, and is the result of fast WR winds sweeping through slower red supergiant winds.
The [OIII] signal dominates this structure (Seen in Greenish Blue - see next image for O3 only), whereas the H-a signal is comparably much weaker (Seen in Red).(APOD)

Imaged with the 16" f3.75 Dream Astrograph.
Apogee Alta U-16M camera.

O3 for 4 hrs (BIN 2)
Ha 60 min (BIN 2)
RGB 10 min per channel

Total of 5.5 hrs

Imaged from Tivoli farm in Namibia May 2015.

Apogee USB/Net
full exif

other sizes: small medium large original auto
Steve Mastellotto23-Jun-2015 11:41
Amazing image. I found your work from the APOD today of this image.
Sakib 16-Jun-2015 18:21
You're on fire, you keep producing quality! This object actually has quite a bit more Ha emission visible with a longer Ha exposure.
Chuck Pavlick16-Jun-2015 08:32
Very nice!
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