Abstract
Results of astrometric and BVRI photometric observations of the active asteroid (596) Scheila are presented. The observations were carried out at the Zeiss-1000 telescope of the Sanglokh International Astronomical Observatory of the Institute of Astrophysics of the Academy of Sciences of the Republic of Tajikistan on June 16−17 and from July 30 to August 1, 2017. The coordinates of the object and its orbit were determined; and the apparent brightness in four filters, the absolute brightness in the V and R filters, and the color indices were obtained. The light curves suggest that no substantial changes in the asteroid’s brightness occurred during the observations. The absolute brightness of the asteroid in the V and R filters was (9.1 ± 0.05)m and (8.8 ± 0.03)m, respectively. The mean value of the asteroid diameter was (119 ± 2) km. The mean values of the color indices (B−V = (0.72 ± 0.05)m, V−R = (0.29 ± 0.03)m, and R−I = (0.31 ± 0.03)m) agree well with the values for asteroids of the P- and D-types and its averages. The rotation period of the asteroid estimated from photometric observations was 16.1 ± 0.2 h. The analysis of the data has shown that the asteroid continues to exhibit the same values of absolute brightness and other characteristics as those before the collision with a small body in December 2010, though the latter resulted in the outburst event and cometary activity of the asteroid. Most likely, the collision of asteroid (596) Scheila with a small body did not lead to catastrophic changes in the surface of the asteroid or to its compete break-up.
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Original Russian Text © G.I. Kokhirova, O.V. Ivanova, F.Dzh. Rakhmatullaeva, U.Kh. Khamroev, A.M. Buriev, S.Kh. Abdulloev, 2018, published in Astronomicheskii Vestnik, 2018, Vol. 52, No. 6, pp. 511–520.
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Kokhirova, G.I., Ivanova, O.V., Rakhmatullaeva, F.D. et al. Results of Complex Observations of Asteroid (596) Scheila at the Sanglokh International Astronomical Observatory. Sol Syst Res 52, 495–504 (2018). https://doi.org/10.1134/S0038094618060035
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DOI: https://doi.org/10.1134/S0038094618060035