1929 Kollaa

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]

1929 Kollaa
Discovery [1]
Discovered byY. Väisälä
Discovery siteTurku Obs.
Discovery date20 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 arc48.64 yr (17,766 days)
Aphelion2.5396 AU
Perihelion2.1862 AU
2.3629 AU
Eccentricity0.0748
3.63 yr (1,327 days)
226.60°
0° 16m 17.04s / day
Inclination7.7797°
65.429°
71.220°
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[lower-alpha 1]
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]

    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.[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

    In the SMASS taxonomy, Kollaa is a bright V-type asteroid.[1]

    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).[lower-alpha 1] 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

    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]

    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).[2] The official naming citation was published by the Minor Planet Center on 1 August 1980 (M.P.C. 5450).[11]

    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. 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. 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. 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. 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. 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.

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