posted on Apr, 6 2004 @ 02:27 PM
You might like to check out DSP satellites and their occasional "glimpses of so called "Fast Walkers"?
""But what makes this particular Fast Walker so peculiar," says Stefula, "is that it comes in from outer space on a curved trajectory, passes
within three kilometers of the satellite platform, and then disappears back into space. Whatever it is, it was tracked for nine minutes."
Taken from here
though searching should find other sources.
Whilst not designed to specifically look into "outer space", but are part of the defence system (for detecting infra-red sources as pre-warning of
missile launches, they *might* fit into your research?