An interloping unidentified object - SOLVED

While doing a time-series on GD 552 (22:50:39.90 +63:28:38.3) around 2014-08-28.33 UT, a bright object entered the 16' x 11' FOV from the west. It took 103 minutes to move 15 arc min. My first guess is a satellite, but its slow movement has me second-guessing. 

Look at a movie made from 44 images.

2014-09-02 UPDATE:

LOL, after using the Minor Planet Center's Minor Planet Checker (thanks for the tip Brian Warner), it turns out that this object is Comet C/2014 E2 (Jacques). Here is the output from Minor Planet Checker:

The following objects, brighter than V = 20.0, were found in the 15.0-arcminute region around R.A. = 22 50 39.90, Decl. = +63 28 38.3 (J2000.0) on 2014 08 28.33 UT:

 Object designation         R.A.      Decl.     V       Offsets     Motion/hr   Orbit  Further observations?
                           h  m  s     °  '  "        R.A.   Decl.  R.A.  Decl.        Comment (Elong/Decl/V at date 1)

    C/2014 E2 (Jacques)  22 51 08.4 +63 26 23         3.2E   2.3S   483-   202-  cmt   (r =   1.29 AU)