The binary Asteroid 22 Kalliope: Linus orbit determination on the basis of speckle interferometric observations

•We carried out speckle interferometry observations for Linus satellite of 22 Kalliope binary asteroid.•The observations were obtained with the 6-m BTA telescope, operated by SAO RAS.•We processed 9 accurate positions of Linus between 10 and 16 December, 2011.•We calculated six classical orbital elements of Linus.•The formal errors of calculated Linus orbit are about 5 mas.

In this paper we present the orbital elements of Linus satellite of 22 Kalliope asteroid. Orbital element determination is based on the speckle interferometry data obtained with the 6-m BTA telescope operated by SAO RAS. We processed 9 accurate positions of Linus orbiting around the main component of 22 Kalliope between 10 and 16 December, 2011. In order to determine the orbital elements of the Linus we have applied the direct geometric method. The formal errors are about 5 mas. This accuracy makes it possible to study the variations of the Linus orbital elements influenced by different perturbations over the course of time. Estimates of six classical orbital elements, such as the semi-major axis of the Linus orbit a = 1109 ± 6 km, eccentricity e = 0.016 ± 0.004, inclination i = 101° ± 1° to the ecliptic plane and others, are presented in this work.