Abstract

The recent use of the U.K. Satellite Laser Ranging System in non-ranging mode to obtain astrometric and photometric observations of artificial satellites is described. It is found that the system is capable of obtaining a series of directional normal points of accuracy about 5″ throughout a pass of a close-Earth satellite. Simultaneous with the directional observations photometric observations were obtained with a time resolution of 0.2 s. The directional and photometric observations obtained from a pass of the discarded rocket body of Cosmos 1844 (1987-41B) have been analysed as a demonstration of the system's potential to yield possible solutions for the behaviour of the spin vector during the pass. It is found to precess on a cone of semi-angle 39°±3° with precession period 8.7±0.7 min.

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