Estimation of stellar instrument magnitudes

Physics

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Scientific paper

The Attitude Determination System (ADS) aboard Space Station Freedom will utilize star trackers (ST) with CCD optical sensors and inertial sensor assemblies (ISA) with ring laser gyro (RLG) inertial rotation sensors. An on-board star catalog of some 2100 stars, with magnitudes extending up to 5.15 instrument magnitude, will be used in conjunction with the ADS. The catalog contains both stellar inertial position and instrument magnitude data. This paper describes the procedure used to estimate the stellar instrument magnitudes for stars in the catalog, and characterizes the associated errors. Basically, the procedure involves the use of published detailed stellar spectral irradiance data and ST vendor provided optical and CCD spectral responsivity curves to numerically determine the instrument magnitudes of the stars associated with the published data.

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