Abstract
We present the resutls of a prompt determination of the uncontrolled attitude motion of the Foton M-2 satellite, which was in orbit from May 31 to June 16, 2005. The data of onboard measurements of the angular velocity vector were used for this determination. The measurement sessions were carried out once a day, each lasting 83 min. Upon terminating a session, the data were transmitted to the ground to be processed using the least squares method and integrating the equations of motion of the satellite with respect to its center of mass. As a result of processing, the initial conditions of motion during a session were estimated, as well as parameters of the mathematical model used. The satellite’s actual motion is determined for 12 such sessions. The results obtained in flight completely described the satellite’s motion. This motion, having begun with a small angular velocity, gradually became faster, and in two days became close to the regular Euler precession of an axisymmetric solid body. On June 14, 2005 the angular velocity of the satellite with respect to its longitudinal axis was approximately 1.3 degrees per second, and the angular velocity projection onto a plane perpendicular to this axis had a magnitude of about 0.11 degrees per second. The results obtained are consistent with more precise results obtained later by processing the data on the Earth’s magnetic field measured on the same satellite, and they complement the latter in determination of the motion in the concluding segment of the flight, when no magnetic measurements were performed.
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Original Russian Text © V.I. Abrashkin, A.E. Kazakova, V.V. Sazonov, S.Yu. Chebukov, 2008, published in Kosmicheskie Issledovaniya, 2008, Vol. 46, No. 2, pp. 148–167.
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Abrashkin, V.I., Kazakova, A.E., Sazonov, V.V. et al. Determination of attitude motion of the Foton M-2 satellite using the data of onboard measurements of its angular velocity. Cosmic Res 46, 146–165 (2008). https://doi.org/10.1134/S0010952508020068
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DOI: https://doi.org/10.1134/S0010952508020068