The Air Force launched a DSP satellite on Friday on a Titan IV launch vehicle. It uses an Interial Upper Stage. There was some anomaly and DSP is now in an incorrect orbit. From the sketchy information available (Air Force says satellite has separated from IUS and that the first stage of the IUS burned nominally, only three objects in orbit have been tracked from this launch) it appears that the first stage of the IUS burned but for some reason the first and second stage never separated. Satellite Catalog Action Report Internatnl Designator CatNo Common Name Source LaunchDate ------------ ----- ------------------------- ------ ---------- 1999-017A 25669 USA 142 US 1999/04/09 1999-017B 25670 TITAN 4 R/B US 1999/04/09 1999-017C 25671 IUS (1) US 1999/04/09 note that there are only three objects from this launch, the IUS (2) stage is missing. The elements for DSP and the IUS are unavailable from OIG. But I would suspect that an orbit of 400 x 19,000 n.m. with a 28.5 degree inclination and injection point half a world away from the Cape would be roughly correct. I strongly doubt the DSP has enough propellant to raise itself to geo altitude. That was only possible with TDRS-A because of the excess propellant onboard. What's interesting to speculate about is the possibility of putting DSP in to a compromise orbit. If it can handle the radiation environment there would be an additional higher resolution DSP available providing supplementary coverage. In any case expect small delays to Titan launches since the upcoming launches don't use the IUS. But almost certainly a delay to the STS-93 AXAF mission. Philip Chien, KC4YER Earth News world (in)famous writer, science fiction fan, ham radio operator, all-around nice guy, etc.