Derby and District Astronomical Society
Caldwell 11 (NGC 7635)
The Bubble Nebula
Emission Nebula in Cassiopeia RA 23h 20m 42s Dec +61d 12m 00s
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This image of the Bubble Nebula was produced by Adrian Brown (imaging) and Chris Newsome (image processing)
in September 2007. The imaging telescope was an 80ED Refractor on a Celestron CGE mount with an ATIK 16HR camera and O-III and H-alpha
filters. This setup was guided using a Skywatcher 80T refractor with an ATIK-2HS camera. The exposures were 16x10min binned 2x2 (2hr 40min)
for the O-III, 4x10min binned 2x2 (40mins) for the H-alpha and 6x30min binned 1x1 (3hrs) also with H-alpha. Total exposure time was
6hrs 20mins. The O-III exposures were combined in Maxim DL with 20 bias and 20 flat exposures and all the exposures (O-III and H-alpha) had a
DDP filter applied to them before combining. The resultant images were processed in CS2 with H-alpha being assigned to the red channel, O-III
assigned to the blue channel and a synthetic green channel being created. |
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Adrian Brown produced the following image of the Bubble Nebula on the 15th July 2005.
It is a monochrome image comprised of 9 x 6 minute exposures taken with an ATK-2HS camera through a Skywatcher EvoStar 80ED refractor.
An Orion SkyGlow light pollution filter was also used. To help with tracking accuracy, he used a C11 SCT / ATK-1C camera combo as a
guidescope along with a freeware program called GuideDog to auto-guide the mount. K3CCDTools was used to capture and stack the images and
then final image processing was done in Maxim DL 4.11 and Photoshop 7. |
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