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.[9] The asteroid was named after the Kollaa River in what is now Russia.[2]
Discovery[1] | |
---|---|
Discovered by | Y. Väisälä |
Discovery site | Turku Obs. |
Discovery date | 20 January 1939 |
Designations | |
(1929) Kollaa | |
Named after | Kollaa River[2] (river in Karelia) |
1939 BS · 1939 CH 1943 GG · 1968 BH 1976 JF3 | |
main-belt · Vestian[3] | |
Orbital characteristics[1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 48.64 yr (17,766 days) |
Aphelion | 2.5396 AU |
Perihelion | 2.1862 AU |
2.3629 AU | |
Eccentricity | 0.0748 |
3.63 yr (1,327 days) | |
226.60° | |
0° 16m 17.04s / day | |
Inclination | 7.7797° |
65.429° | |
71.220° | |
Physical characteristics | |
Dimensions | 6.06 km (calculated)[3] 6.71±0.34 km[4] 7.772±0.147 km[5][6] |
2.980±0.005 h[a] 2.9887±0.0004 h[7] | |
0.3855±0.0958[5] 0.393±0.066[4][6] 0.4 (assumed)[3] | |
SMASS = V[1] · V[3] | |
12.2[5] · 12.50[4] · 12.6[1] · 12.64±0.32[8] · 12.7[3] | |
Kollaa 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.[10]
The asteroid orbits the Sun in the inner main-belt at a distance of 2.2–2.5 AU once every 3 years and 8 months (1,327 days). Its orbit has an eccentricity of 0.07 and an inclination of 8° with respect to the ecliptic.[1] As no precoveries were taken, the asteroid's observation arc begins with its discovery.[9]
In the SMASS taxonomy, Kollaa is a bright V-type asteroid.[1]
It has a well-defined rotation period of 2.98 hours, derived from two rotational lightcurve analysis. In March 2004, photometric observations at the U.S. Magdalena Ridge Observatory in New Mexico rendered a period of 2.980 hours with a brightness variation of 0.20 in magnitude (U=3).[a] 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 2.9887 hours and an amplitude 0.22 in magnitude (U=3).[7]
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.[4][5] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.40 and calculates a diameter of 6.4 kilometers with an absolute magnitude of 12.7.[3]
This minor planet is named after the Kollaa River in Karelia, the focal point of violent battles during the Finnish Winter War (1939–40).[2] The official naming citation was published by the Minor Planet Center on 1 August 1980 (M.P.C. 5450).[11]