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1929 Kollaa

1929 Kollaa
Discovery 
Discovered by Y. Väisälä
Discovery site Turku Obs.
Discovery date 20 January 1939
Designations
MPC designation (1929) Kollaa
Named after
Kollaa River (in Karelia)
1939 BS · 1939 CH
1943 GG · 1968 BH
1976 JF3
main-belt · Vestian
Orbital characteristics
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 48.38 yr (17,672 days)
Aphelion 2.5396 AU
Perihelion 2.1854 AU
2.3625 AU
Eccentricity 0.0750
3.63 yr (1,326 days)
172.30°
0° 16m 17.04s / day
Inclination 7.7798°
65.433°
71.236°
Physical characteristics
Dimensions 6.06 km (calculated)
6.71±0.34 km
7.772±0.147 km
2.980±0.005 h
2.9887±0.0004 h
0.3855±0.0958
0.393±0.066
0.4 (assumed)
SMASS = V  · V
12.2 · 12.50 · 12.6 · 12.64±0.32 · 12.7

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 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 2.9887±0.0004 hours and an amplitude 0.22 in magnitude (U=3).


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