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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 asteroid was named after the Kollaa River in what is now Russia.

Orbit and classification

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.

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. As no precoveries were taken, the asteroid's observation arc begins with its discovery.

Physical characteristics

In the SMASS taxonomy, Kollaa is a bright V-type asteroid.

Lightcurves

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). 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).

Diameter and albedo

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 with an absolute magnitude of 12.7.

Naming

This minor planet is named after the Kollaa River in Karelia, the focal point of violent battles during the Finnish Winter War (1939–40). The official naming citation was published by the Minor Planet Center on 1 August 1980 (M.P.C. 5450).

Notes

1. ^ 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).

References

1. ^ "JPL Small-Body Database Browser: 1929 Kollaa (1939 BS)" (2016-09-14 last obs.). Jet Propulsion Laboratory. Archived from the original on 18 September 2020. Retrieved 10 June 2017.
2. ^ 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. ^ "LCDB Data for (1929) Kollaa". Asteroid Lightcurve Database (LCDB). Retrieved 24 July 2016.
4. ^ 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. S2CID 46350317. Retrieved 24 July 2016.
5. ^ 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. S2CID 35447010. Retrieved 24 July 2016.
6. ^ 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. S2CID 118745497. Retrieved 8 December 2016.
7. ^ 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. S2CID 53493339. Retrieved 24 July 2016.
9. ^ "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.

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 21 July 2011 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 1929 Kollaa at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1929 Kollaa at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

• Minor planet object articles (numbered)
• Vesta asteroids
• Discoveries by Yrjö Väisälä
• Named minor planets
• V-type asteroids (SMASS)
• Astronomical objects discovered in 1939