M102 is a galaxy lited in the Messier catalog that has yet to be identified unambiguously. The original discoverer Pierre Me'chain said that it was a duplicate observation of M101.

http://en.wikipedia.org/wiki/Messier_102

ABOUT THE IMAGE

DATE/TIME:  The evening of April 14th, 2012.

CAMERA:  Canon XSI, 450Dm

TELESCOPE:  Orion 100mm ED refractor @ F/9.

ISO SETTING:  800

EXPOSURES:  18

EXPOSURE LENGTH:  400sec.

TOTAL EXPOSURE LENGTH:  2hrs.

SUBTRACTIONS:  10 darkframes, 10 bias frames, 20 flat frames.

CAPTURE SOFTWARE:  MaximDL

STACKING SOFTWARE:  Deep Sky Stacker

PROCESSING:  Photoshop CS3