Derby and District Astronomical Society

Caldwell 11 (NGC 7635)
The Bubble Nebula

Emission Nebula in Cassiopeia      RA 23h 20m 42s  Dec +61d 12m 00s

[Caldwell Index]

This image of the Bubble Nebula was captured by Peter Branson and is made from two sets of images collected on August 8th and September 10th, 2015. The final image is made up from eight 60 second, fifteen 300 second and five 600 second exposures. The photos were taken with an ATIK 314L+ colour CCD camera attached to TS Photoline ED102 refractor telescope with field-flattener and Hutech IDAS light pollution filter attached. The telescope was guided using an Orion Mini autoguider controlled by PHD software. The images were stacked and further processed with 'curves' and 'levels' in Nebulosity.  Image Copyright: Peter Branson.

Adrian Brown captured this hydrogen-alpha photograph of The Bubble Nebula from imaging performed on the 14th, 15th and 16th of October 2011 using his Celestron 5" Schmidt-Cassegrain. The photograph is composed of 26 x 15 minute exposures. The telescope was focal reduced from f/10 to f/7 (approx 900mm focal length) and Adrian used his Atik ATK16HR CCD camera.  Image Copyright: Adrian Brown.

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.  Image Copyright: Adrian Brown and Chris Newsome.

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.  Image Copyright: Adrian Brown.

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