Click here for a higher resolution image of the Cygnus Bubble Nebula (579 Kb)

Click here to compare this image with one taken by astronomers using the Kitt Peak 4-meter Mayall telescope



The Details
Cygnus Bubble Nebula PN G75.5+1.7 (aka: Soap Bubble Nebula)
12.5" RCOS Ritchey-Chretien @ f/6.9
Astro-Physics 1200 GTO
Tru-Balance 6nm Hydrogen Alpha Filter, 3nm OIII Filter
24 and 25 July 2009; 01 and 02 August 2009
Mount Wilson Observatory - Mount Wilson, CA
Ha 19 x 1200 sec, 1x1 bin; OIII 13 x 1800 sec, 1x1 bin
Maxim DL/CCD, CCD Stack, Photoshop CS 4
Field of View: 23'06"’ x 15'31" centered on RA 20h15m26.4s
DEC +38°02’25” (2000.0) . North angle 270.5°; east 90° CCW from north.

The above "false color" image was created using a bicolor technique for combining Ha and OIII images developed by amateur astronomer Steve Cannistra ( Using data from these two filters, a synthetic green channel (Sg) was created in Photoshop. The color assignments used were Ha (red), Sg (green), OIII (blue). The finished image is a composite Ha(Ha:Sg:OIII), using the Ha channel as a luminance layer to enhance detail in the final representation.

For the sake of comparison, the orientation of this image was made to match that taken by the 4 meter Mayall telescope at Kitt Peak on June 19, 2009. Undoubtedly the nebula does not show us as prominently as in the Kitt Peak image, but it nevertheless does speak well for what a 6 inch Astro-Physics refractor is capable of when imaging such a faint object.




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