Isn’t this an amazing target!

When I first heard about this, I had to give it a crack, and at the time of publication (Feb, 2015) this was the 12th image captured of this rare & dim object.

12 Hrs 3nm O3 x 1200 secs
1hr each RG & B 60 secs

There is a little Ha present, but it was a cleaner image without.

Processed in Nebulosity & Photoshop CC 2018

Gold Award AIPP APPA 2015, Gold Award AIPP VIC 2015, Gold Distinction Award WPPI 2015, Highly Commended CWAS David Malin Awards 2015

Sh2-308 Nebula astrophotography wolf-rayet star image
SH2-308 Nebula

Capture Details

TelescopeWilliam Optics FLT 110
CameraQSI 683 WSG8
MountSkywatcher EQ6 Pro
FiltersAstrodon 3nm O3 & RGB
Guiding CameraStarlight Xpress Lodestar X2
Integration time (Exposure)14 hrs
LocationBurwood, Melbourne, Victoria, Australia
DateFeb, 2015

About this Nebula

Blown by fast winds from a hot, massive star, this cosmic bubble is huge. Cataloged as Sharpless 2-308 it lies some 5,200 light-years away toward the constellation of the Big Dog (Canis Major) and covers slightly more of the sky than a Full Moon. That corresponds to a diameter of 60 light-years at its estimated distance. The massive star that created the bubble, 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 a blue hue. SH2-308 is also known as The Dolphin Nebula. (APOD)

A Cosmic Bubble

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This thing is dim, as in “Disaster Area” dim – the Rock Band with the black spaceship with a black interior that has weird black controls that are labeled in black on a black background, with little black lights that light up black!

- Douglas Adams