| Discovery[1] | |
|---|---|
| Discovered by | Y. Väisälä |
| Discovery site | Turku Obs. |
| Discovery date | 20 January 1939 |
| Designations | |
| (1929) Kollaa | |
Named after | Kollaa River[2] (river inKarelia) |
| 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 | 2.5396AU |
| Perihelion | 2.1862 AU |
| 2.3629 AU | |
| Eccentricity | 0.0748 |
| 3.63yr (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±0.0004h[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] | |
1929 Kollaa, provisional designation1939 BS, is a stony Vestianasteroid from the inner regions of theasteroid belt, approximately 7 kilometers in diameter. It was discovered by Finnish astronomerYrjö Väisälä atTurku Observatory in Southwest Finland, on 20 January 1939.[9] The asteroid was named after theKollaa River in what is now Russia.[2]
Kollaa is a member of theVesta family. Vestian asteroids have a composition akin to cumulateeucrite meteorites and are thought to have originated deep within4 Vesta's crust, possibly from theRheasilvia crater, a largeimpact 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 after1 Ceres.[10]
The asteroid orbits the Sun in theinner main-belt at a distance of 2.2–2.5 AU once every 3 years and 8 months (1,327 days). Its orbit has aneccentricity of 0.07 and aninclination of 8° with respect to theecliptic.[1] As noprecoveries were taken, the asteroid'sobservation arc begins with its discovery.[9]
In theSMASS taxonomy,Kollaa is a brightV-type asteroid.[1]
It has a well-definedrotation period of 2.98 hours, derived from two rotationallightcurve 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 inmagnitude (U=3).[a] In 2008 a second, concurring period was obtained by French amateur astronomerPierre Antonini at his privateObservatoire 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'sWide-field Infrared Survey Explorer and its subsequentNEOWISE mission, the body measures 6.7 and 7.7 kilometers in diameter, respectively, and its surface has analbedo 0.39.[4][5] while theCollaborative Asteroid Lightcurve Link assumes an albedo of 0.40 and calculates a diameter of 6.4 kilometers with anabsolute magnitude of 12.7.[3]
Thisminor planet is named after theKollaa River in Karelia, the focal point of violent battles during the FinnishWinter War (1939–40).[2] The official naming citation was published by theMinor Planet Center on 1 August 1980 (M.P.C. 5450).[11]
