پیوند به بیرون[ویرایش]
2006 Polonskaya, provisional designation 1973 SB3, is a stony Florian asteroid and asynchronous binary system from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 22 September 1973, by Soviet astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula, and later named after Russian astronomer Elene Polonskaya.
Classification and orbit
Polonskaya is a member of the Flora family, one of the largest collisional populations of stony asteroids. It orbits the Sun in the inner main-belt at a distance of 1.9–2.8 AU once every 3 years and 6 months (1,295 days). Its orbit has an eccentricity of 0.19 and an inclination of 5° with respect to the ecliptic.
Several rotational lightcurves of Polonskaya were obtained from photometric observations. Lightcurve analysis gave a rotation period between 3.114 and 3.1183 hours with a brightness amplitude of 0.18–0.10 magnitude for the best rated results (U=3/3/3/3).
Diameter and albedo
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Polonskaya measures 4.625 kilometers in diameter and its surface has an albedo of 0.354. The Collaborative Asteroid Lightcurve Link adopts Petr Pravec's revised WISE-data, that is, an albedo of 0.3498 and a diameter of 4.80 kilometers based on an absolute magnitude of 13.35.
In 2005, it was claimed that lightcurve observations indicate that Polonskaya has a small moon about 0.99 km in diameter. However, the non-synchronously rotating binary still needs to be fully resolved in order to confirm such satellite. Alternatively, the presence of another body has also been suggested to explain the lightcurve's irregular period, which would make it a trinary asteroid.
This minor planet was named after Russian astronomer Elena Ivanovna Kazimirchak-Polonskaya (1902–1992), who researched the motion and orbital evolution of comets, in particular the capture of comets by major planets. She was a member of IAU's Commission XX, and was awarded the F. A. Bredikhin prize. The approved naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 4481).