Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2018, Vol. 15, No. 6, pp. 69-81
Adaptation of star catalogues for their application in star trackers
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: 02.11.2018
DOI: 10.21046/2070-7401-2018-15-6-69-81
Star trackers used in the attitude control systems of many Russian and foreign spacecraft are constantly observing the celestial sphere, measuring the coordinates of the stars included in their onboard catalogues. With the development of instruments, the accuracy of measurement of stars’ coordinates improves, and the difference between the obtained results and catalogue coordinate values of a significant number of stars becomes more and more noticeable. It arises from very large differences in the angular resolution of astronomical instruments used for cataloguing and star trackers. In this regard, it becomes necessary to bring the onboard star catalogues into conformity with the observational capabilities of the star trackers. This problem can be solved by using statistics of direct measurements of the required corrections for the stars’ coordinates of the onboard catalog. Until quite recently, it was actually the only way to solve the problem. But there is another way ― to calculate these corrections, having an all-sky astronomical star catalog up to the 13th star magnitude and using mathematical simulation techniques for the star tracker. This way has become possible thanks to the European astrometric project Gaia. Both methods have their advantages and disadvantages discussed in this article.
Keywords: star tracker, astrometry, stars catalogue, stars of neighborhood, catalogue correction, statistical method, method of mathematical design
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