NGC 7538 is an emission nebula located approximately 9,100 light-years from earth in the constellation Cepheus.  NGC 7538 is home to the largest yet discovered protostar, which is approximately 300 times the size of our own solar system.

http://en.wikipedia.org/wiki/NGC_7538

ABOUT THE IMAGE

DATE/TIME:  Taken on the evenings of September 28th and 30th, 2013.

CAMERA:  Canon XSI, 450Da

TELESCOPE:  Celestron C9.25" SCT @ F/6.3

ISO SETTING:  800

EXPOSURES:  69

EXPOSURE LENGTH:  300sec.

TOTAL EXPOSURE LENGTH:  5hrs, 45min.

SUBTRACTIONS: 32 dark frames, 40 flat frames and 16 dark-flat frames.

CAPTURE: MaximDL

STACKING/PRE-PROCESSING: Deep Sky Stacker

PROCESSING: Photoshop CS3