Smithsonian Astrophysical Observatory Program Writeup (scroge)

Statistics – Computation

Scientific paper

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Scientific paper

The Smithsonian Computations Relating Orbital Glimpses Everywhere (SCROGE) program is used in the tracking of satellites; it aids in predicting satellite positions and in transmitting these positions to the observing stations. The SCROGE does three things: (1) it determines when and from where the satellite is visible; (2) it computes the arcs along which the Baker-Nunn cameras will track to match the apparent motion of the satellite; and (3) it produces an operating or observing schedule and camera settings for the station. The coordinate systems, the expressions used to evaluate satellite and sun coordinates, the visibility criteria, and the mathematics involved in computing the great-circle arcs that approximate the satellite's apparent motion are given.

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