1929 Kollaa

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1929 Kollaa
Discovery [1]
Discovered byY. Väisälä
Discovery siteTurku Obs.
Discovery date20 January 1939
MPC designation(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 arc48.64 yr (17,766 days)
Aphelion2.5396 AU
Perihelion2.1862 AU
2.3629 AU
3.63 yr (1,327 days)
0° 16m 17.04s / day
Physical characteristics
Dimensions6.06 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]
0.4 (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 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]

Orbit and classification[edit]

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]

Physical characteristics[edit]

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]

Diameter and albedo[edit]

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]


  1. ^ a b Ryan (2007) web: rotation period 2.980±0.005 hours with a brightness amplitude of 0.22 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (1929) Kollaa from unpublished results by W. H. Ryan and E.V. Ryan, (2007).


  1. ^ a b c d e f "JPL Small-Body Database Browser: 1929 Kollaa (1939 BS)" (2016-09-14 last obs.). Jet Propulsion Laboratory. Retrieved 10 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(1929) Kollaa". Dictionary of Minor Planet Names – (1929) Kollaa. Springer Berlin Heidelberg. p. 155. doi:10.1007/978-3-540-29925-7_1930. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f "LCDB Data for (1929) Kollaa". Asteroid Lightcurve Database (LCDB). Retrieved 24 July 2016.
  4. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 24 July 2016.
  5. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 24 July 2016.
  6. ^ a b Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 8 December 2016.
  7. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1929) Kollaa". Geneva Observatory. Retrieved 24 July 2016.
  8. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 24 July 2016.
  9. ^ a b "1929 Kollaa (1939 BS)". Minor Planet Center. Retrieved 24 July 2016.
  10. ^ Kelley, Michael S.; Vilas, Faith; Gaffey, Michael J.; Abell, Paul A. (September 2003). "Quantified mineralogical evidence for a common origin of 1929 Kollaa with 4 Vesta and the HED meteorites". Icarus. 165 (1): 215–218. Bibcode:2003Icar..165..215K. doi:10.1016/S0019-1035(03)00149-0. Retrieved 18 January 2016.
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 July 2016.

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