3982 Kastel'
3982 Kastel, provisional designation , is a Florian asteroid and a suspected binary system from the inner regions of the asteroid belt, approximately 6.9 kilometers in diameter. It was discovered on 2 May 1984, by Russian astronomer Lyudmila Karachkina at the Crimean Astrophysical Observatory in Nauchnij on the Crimean peninsula. It is named after Soviet astronomer Galina Kastel'. Classification and orbit. "Kastel" is a member of the Flora family, one of the largest families of stony asteroids. It orbits the Sun in the inner main-belt at a distance of 1.8–2.8 AU once every 3 years and 5 months  (1,240 days). Its orbit has an eccentricity of 0.22 and an inclination of 5° with respect to the ecliptic. "Kastel" was first identified as at Lowell Observatory in 1930, extending the asteroid's observation arc by 54 years prior to its discovery observation. Physical characteristics. "Kastel" has been characterized as a dark and reddish P-type asteroid by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, despite measuring an albedo of 0.20. It is also an assumed S-type asteroid. Diameter and albedo. According to the survey carried out by NASA's Wide-field Infrared Survey  Explorer (WISE) with its subsequent NEOWISE mission, "Kastel" measures 6.79 kilometers in diameter and its surface has an albedo of 0.201, while Petr Pravec's revised estimates of the thermal WISE observation gave a lower albedo of 0.1695 and consequently a larger diameter of 6.90 kilometers with an absolute magnitude of 13.35. Lightcurve. In September 2009 and February 2014, two rotational lightcurves were obtained for this asteroid. Lightcurve analysis gave a rotation period of and hours with a brightness variation of 0.27 and 0.28 magnitude, respectively (). Suspected binary. During the first of the two a photometric observations – a collaboration between  Czech astronomers Petr Pravec, Peter Kušnirák, Leonard Kornoš and Jozef Világi at Ondřejov Observatory, as well as American astronomers Donald Pray, Russel Durkee, Walter R. Cooney Jr., John Gross and Dirk Terrell at several locations in the United States – it was revealed, that "Kastel"s lightcurve consisted of two linearly additive components, indicative for the presence of an asteroid moon. However, no attenuations were observed, which typically occur when the primary and secondary body are eclipsing each other. After a second observation in 2014, the binary nature of "Kastel" still remains uncertain. The "Johnstonsarchive" gives no estimates. Naming. This minor planet  was named in honor of Soviet astronomer Galina Ričardovna Kastel' astronomer at the Institute for Theoretical Astronomy (ITA) at Saint Petersburg (then Leningrad). A discoverer of minor planets herself, she is a known expert of the motions of small Solar System bodies and was involved with astrometric work at the discovering observatory. The approved naming citation was published by the Minor Planet Center on 28 May 1991 ().