It is possible to hide a satellite but maybe not for amateur.
Misty is reported to have optical and radar stealth characteristics, making it difficult for adversaries to detect (and thus predict the times it would fly overhead).
Almost everything about the program is classified information—but one clue about satellite camouflage has been found in the patent literature. Patent #US 5345238 describes an inflatable balloon that can be made rigid on exposure to ultraviolet radiation that can serve to lower the radar and optical signature of the satellite. Once deployed, the cone-shaped balloon could be steered to deflect incoming laser and microwave radar energy by sending it off into outer space. Whether or not these stealthy ideas are actually used in the Misty satellite series is not publicly known.
http://en.wikipedia.org/wiki/Misty_(satellite)