NASA TV UFOs:
NASA Films UFO during the STS-61 Mission

It seems that the camera operator zooms in on a disk shaped UFO with a dome on top:

http://www.youtube.com/watch?v=QA43u2ZZpi0

The unknown object is filmed behind the Hubble Space Telescope.

The NASA STS-61 Space Shuttle Endeavour mission:

Launch date: 2 December 1993 -
Landing date: 13 December 1993.