Found this on my travels...
This video was made June 29, 2011 using all of the STEREO AHEAD (A) H1 images from June 5 to June 27, 2011. Motion Tracking was used in Adobe After Effects to stabilize the background star pattern and thereby isolate the Comet's movement. The apparent motion of the background is caused by the orbit of the STEREO AHEAD (A) satellite. We have included the following JPL orbit simulation for this object and its relationship to the STEREO AHEAD (A) satellite. The red beam represents the approximate field of view of the satellite.
The orbit simulation clearly shows that there are no planets transiting at this time in this field of view. In the following video, approximately one second of playing time represents a 24 hour period of observations.
The object that is moving is clearly following the orbital path of C/2010 X1.
https://www.youtube.com/watch?v=c_nLjpxo5IA&feature=player_embedded#at=192
Eric J
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