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Paper: Calculating the Position and Velocity Components of HST
Volume: 77, Astronomical Data Analysis Software and Systems IV
Page: 464
Authors: Ake, T. B.
Abstract: The HST uses an onboard model of its orbit to perform in real-time various control functions relating to spacecraft operations and observation support. The flight software uses the equation of center to solve Kepler's equation for two bodies. New coefficients for the ephemeris are updated every other day, and are archived as FITS keywords for each HST observation data set. Using these coefficients,an observer can perform a variety of calibration and characterization calculations relating to the orbital position and velocity of the telescope. We present here the methodology for computing the HST state vectors using this information.
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