I researched this a little last night and its in a low orbit..The Russians allegedly tracked it in 1960 following one their Sputniks by normal radar.
Other people as we know have photographed it..
The thing that interested me was that Tesla was supposed to have received messages from it around 1899 and radio hams also received messages from it in 1928 and further on in the 1950s the messages were also received and it was tracked by radar..other people claim to have understood what these messages were actually saying, such as where it came from etc etc..
I realised then that it was transmitting on several different wavelengths such as, very low frequency (VLF) by which Tesla would have received it....High Frequencies (HF) in 1928...very high frequencies (VHF) and also ultra high frequencies (UHF) in the 1950s and 1960s
This could possibly be done to let people understand what they were saying to us, as we developed our knowledge of radio and electronics thoughout the decades..
As for the lack of very little information given to us, i dont think there is much more to be said about it, other than what we already have..