Here's a "sub-starved" (only 7x3 minutes) composite of the often photographed Bubble Nebula in Cassiopeia. Why only 21 minutes total? I started collecting the subs "too late" for a full run: the camera and scope were about to "run into" the mount. So it goes. In any case, there are dozens if not hundreds of superlative images of the Bubble Nebula online.
The image is still "under construction," as more subs are required. The slight red cast to the image is apparently due to the extensive nebulosity in the region. Aesthetically considered, I don't like the red cast, and have tried to mute it. However, the red cast may be inevitable. This link connects with a close-up of the Bubble Nebula made with a 20" RC and an SBIG ST-11000. The detail is wonderful. Notice the pervasive red nebulosity, which is especially evident in the 11 o'clock direction.
This link connects with an early shot by Jerry Lodriguss (a most accomplished astroimager and author), using gas-hypersensitized Fujicolor Super G 800 film. The shot offers an interesting comparison between what was (film) and what is (digital photon collection). Jerry offers a few astrophysical details concerning NGC 7635, including the fact that it's one of only two such objects.
Astrophysical data
The bright star (at 12 o'clock) is SAO 20562 with an integrated visual magnitude of 6.94. The Bubble Nebula itself (15'x15') surrounds SAO 20575, an 8.53 VM star about 20x as massive as Sol. The complex is estimated to be 11300 LY distant.
Equipment
SV 115 + TV .8 focal reducer + CGE + SBIG ST-2000XCM
Processing
ImagesPlus v3.0 beta 7 primarily + resized and saved for the Web in PS CS2
Max
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