ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2019, Vol. 16, No. 5, pp. 75-84

Photometric model of star tracker orientation

G.A. Avanesov 1 , N.A. Stroilov 1 , O.V. Filippova 1 , V.A. Shamis 1 , Ya.D. Elyashev 1 
1 Space Research Institute RAS, Moscow, Russia
Accepted: 04.10.2019
DOI: 10.21046/2070-7401-2019-16-5-75-84
The photometric model of a stellar orientation sensor is an important component of the mathematical model of the device as a whole. Namely, it allows mathematically correct transition from the stellar magnitudes and spectral characteristics of stars given in astronomical catalogs to the values of their integral brightness actually perceived by the instruments. This is necessary because modern stellar orientation sensors measure the coordinates of stars in the celestial sphere, receiving their black-and-white images in a fairly wide range of the visible and near infrared spectral regions of electromagnetic radiation. In this case, the spectral characteristic of the device is determined by the optics used in it and the matrix radiation detector. The integrated brightness of a star measured by the instrument depends on its spectral characteristic, as well as on the magnitude and spectral class of the observed object. A priori knowledge of the response of the instrument to the appearance of stars of different brightness and different spectral classes in its field of vision is necessary both for compiling stellar catalogs and for obtaining numerical estimates of the accuracy of measuring their coordinates, including at different noise levels. The reliability of the photometric model of the stellar orientation sensor given below is confirmed by experimental data obtained by similar instruments during space flight.
Keywords: star tracker, photometry, star catalog, point spread function, color index, spectral transmittance, integrated star brightness, method of mathematical design
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