NGC 7023, also designated Caldwell 4, and commonly called the Iris Nebula, is a bright reflection nebula in the constellation Cepheus.  NGC 7023, is actually the cluster within the nebula LBN 487 and is illuminated by the magnitude 7 star, SAO 19158. The nebula itself lies about 1,300 light-years from Earth and has a diameter of approximately 6 light-years.

http://en.wikipedia.org/wiki/NGC_7023

 

DATE/TIME:  The evening of July 22nd, 2014.

CAMERA:  Canon XSI, 450Da

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

ISO SETTING:  800

EXPOSURES:  42

EXPOSURE LENGTH:  300sec.

TOTAL EXPOSURE LENGTH:  3hrs, 30min.

CAPTURE SOFTWARE:  MaximDL

STACKING SOFTWARE:  Deep Sky Stacker

PROCESSING:  Photoshop CS3