Discovered by Y. Väisälä MPC designation 1929 Kollaa Observation arc 48.38 yr (17,672 days) Orbits Sun Discovery site Iso-Heikkilä Observatory | Discovery date 20 January 1939 Minor planet category main-belt · Vestian Discovered 20 January 1939 Discoverer Yrjö Väisälä | |
Alternative names 1939 BS · 1939 CH1943 GG · 1968 BH1976 JF3 Similar Asteroid belt, Solar System, 1450 Raimonda, Sun, 17 Thetis | ||
1929 Kollaa, provisional designation 1939 BS, is a stony Vestian asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland, on 20 January 1939.
The bright V-type asteroid is a member of the Vesta family. Vestian asteroids have a composition akin to cumulate eucrite meteorites and are thought to have originated deep within 4 Vesta's crust, possibly from the Rheasilvia crater, a large impact crater on its southern hemisphere near the South pole, formed as a result of a subcatastrophic collision. The asteroid Vesta is the main-belt's second-most-massive body after 1 Ceres.
1929 Kollaa orbits the Sun at a distance of 2.2–2.5 AU once every 3 years and 8 months (1,326 days). Its orbit has an eccentricity of 0.08 and an inclination of 8° with respect to the ecliptic. As no precoveries were taken, the asteroid's observation arc begins with its discovery.
It has a well-defined rotation period of 2.98 hours, derived from two rotational light-curve analysis. In March 2004, photometric observations at the U.S. Magdalena Ridge Observatory in New Mexico rendered a period of 7000298000000000000♠2.980±0.005 hours with a brightness variation of 0.20 in magnitude (U=3). In 2008 a second, concurring period was obtained by French amateur astronomer Pierre Antonini at his private Observatoire de Bédoin in France (132). It gave a period of 7000298870000000000♠2.9887±0.0004 hours and an amplitude 0.22 in magnitude (U=3).
According to the surveys carried out by NASA's Wide-field Infrared Survey Explorer and its subsequent NEOWISE mission, the body measures 6.7 and 7.7 kilometers in diameter, respectively, and its surface has an albedo 0.39. while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.40 and calculates a diameter of 6.4 kilometers.
The minor planet is named after the Kollaa River in Karelia, the focal point of violent battles during the Finnish Winter War (1939–40). Naming citation was published on 1 August 1980 (M.P.C. 5450).