I was doing a timelapse video of the Moon tonight and noticed a pair of satellites on the video aftwerwards. I looked up Calsky and found that they were the Gravity Recovery Climate Experiment (GRACE) satellites 1 and 2 (nicknamed Tom and Jerry). Here is the annotated video:
Thanks guys. This one made LPOD for yesterday - the Lunar link being that these satellites have a similar function to the GRAIL satellites orbiting the Moon.