NGC 6826 also known as Caldwell 15, is a planetary nebula located in the constellation Cygnus 'The Swan."  It is commonly refered to as the "blinking planetary," although many other nebulae also exhibit such "blinking."

http://en.wikipedia.org/wiki/NGC_6826

ABOUT THE IMAGE

DATE/TIME:  Taken on the evening of September 5th, 2013.

CAMERA:  Canon XSI, 450Da

TELESCOPE:  Celestron C9.25" SCT @ F/20

ISO SETTING:  800

EXPOSURES:  17

EXPOSURE LENGTH:  200sec.

TOTAL EXPOSURE LENGTH:  56min, 40sec.

SUBTRACTIONS: 16 dark frames, 10 bias frames.

CAPTURE: MaximDL

STACKING/PRE-PROCESSING: Deep Sky Stacker

PROCESSING: Photoshop CS3