A while ago we were discussing observations of geosynchronous satellites by amateur satellite watchers with commercially available equipment. I had the good fortune to be able to attend the fourteenth running of the annual space surveillance symposium at the MIT Lincoln Laboratory in Lexington, MA, USA this year, and, mirabile dictu, there was a paper on a closely related topic. Here is my summary of the presentation and the corresponding paper in the conference proceedings: PIMS [Passive Imaging Metric Sensor]: Progress Report on a Deep- Space Metric Sensor Project by J. Dick, A. Sinclair (Royal Greenwich Observatory, Cambridge, UK), P. Liddell (Defence Research Agency, UK) and D. Holland (Ministry of Defence, UK) Proceedings of the 1996 Space Surveillance Workshop Lincoln Laboratory, MIT April 2-4, 1996 K.P. Schwan, editor Project Report STK-245, Vol.1 ESC-TR-96-026 In June of 1995 the UK Ministry of Defence entered into discussions with the Royal Greenwich Observatory to develop a space surveillance system to monitor the part of the geosynchronous belt where the MoD operates military communications satellites. A contract was let to RGO in September, and engineering testing of the system began in January 1996 at Greenwich. It is anticipated that the system will be installed in a three-meter astronomical dome on either Gibraltar or Cyprus and that full operational capability will be attained in the summer of 1996. The system consists of a Meade 16-inch telescope on a computer-controlled tripod mount, a CCD camera, a Power Macintosh computer with three CD ROM drives to access the Hubble Guide Star Catalogue or other star catalogue, and software to support automatic detection of satellites. Tasking can be done remotely by modem, which will be used also for transferring the results of the observations to the UK. The system is expected to be able to detect geosynchronous satellites as faint as visual magnitude 18, roughly corresponding to meter-sized objects of average albedo. Because all astrometric measurements are made by reference to the star field and the HGSC, the mount's angle encoders need not be extremely accurate.