Sh2-308 (Sharpless 308) is an 35´x 35´arcmin. large emission nebula in the constellation of Canis Major,the light source of which is the Wolf-Rayet-Star WR6 (=EZ Can.Maj.) at the top left of our picture.
This star is a very hot and bright one and their is some evidence,that it might explode some day as a supernova.
This star lost a huge gas cloud about 70.000 years ago,which no form this beautiful emission nebula,mainly emitting light in the wavelenght of OxygenIII.The distance from us is about 4500 light-years,but the right value is something uncertain.
Our maximum FOV with the FLI-camaera is a squared 22,5´arcmin.,therefore we only show the brightest part of this bubble here.Sh2-308 is also nicknamed as "Dolphin-Nebula".
position (epoch 2000):
Ra.: 06h 54m 13s
Decl.: -23° 55′ 42″
L = synth. from all RGBs
RGB= 7 x 1200s each
OIII = 8 x 2400s (mixed to G and B)
a total of 7.6 hours
80cm f/7 AstroOptik Keller corrected cassegrain
FLI Proline 16803 Astrodon LRGB GenII filters
Prompt 7 CTIO/UNC Chile,remote controlled
image processing: Bernd Flach-Wilken
Here you see the brightest part of the Sh2-308 Emission-Nebula-Bubble in a 21´x21´ FOV.
The bright blue star to the top left of this photo is the Wolf-Rayet star WR6 (=EZ CanMaj.)
For full resolution click HERE
HERE you can see the full extension of th Bubble Sh2-308 (Irida Observatory)