NASA TV UFOs: Approaching UFO Filmed
near Space Shuttle Discovery, 29 August 2009

The NASA camera seems to zoom in on the unknown, self-luminous, pulsating object and after a short while the camera swivels to the left to get the object in sight again:

http://www.youtube.com/watch?v=ykEYCvbIdUA

The NASA STS-128 (ISS assembly flight 17A)
Space Shuttle Discovery mission:

Launch date: 28 August 2009 -
Landing date: 10 September 2009.