Bubble, bubble, double trouble.
SH2 308 (Sharpless Catalogue) is a large bubble mostly in O3. I was inspired to image this object from Marco's original image of it which is probably the definitive image of this object.
Using the Trius 694 with its something like 66% QE in O3 (the highest of any sensor) I thought I would have a go at it. The Honders tends to do those big halos on really bright stars but I actually don't mind that as it really shows this star is a monster. Like an old Mt Palomar photo.
I almost did not get anywhere as my S11 and O111 filters were mislabelled as each other and it does not show up in S11. So at first I could not find it. I suspected something was amiss when I was clearly identifying the star patterns surrounding it yet nothing was showing up in a 30 second framing shot.
It shows up somewhat in Ha but dimly. I am happy that the Honders picked up so much Ha as I have not seen this much in other images. There definitely seems to be a Ha bubble behind the main O3 bubble.
Its a large object and really could do with a larger sensor on this one but that's what was on the scope and getting everything tilt free is a bit of a procedure so....
http://www.pbase.com/gregbradley/image/162575405/large regular size
http://www.pbase.com/gregbradley/ima...75405/original Larger size
O3 Ha LRGB image.
Greg.