"Sometimes, astronomers really do need to use rocket science when they observe unidentified objects in the sky. Especially if they wind up identifying, well, a rocket.
NASA scientists used a combination of high technology and backyard astronomers' observations to confirm the identity of an object that's been circling the earth since early September. "

This is an interesting read...check it out. They think its part of Apollo 12.

Rocket Scientists Find a Rocket