Open main menu

2006 Polonskaya, provisional designation 1973 SB3, is a stony Florian asteroid and asynchronous binary system from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 22 September 1973, by Soviet astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula, and later named after Russian astronomer Elene Polonskaya.[2][11]

2006 Polonskaya
Discovery [1]
Discovered byN. Chernykh
Discovery siteCrimean Astrophysical Obs.
Discovery date22 September 1973
MPC designation(2006) Polonskaya
Named after
Elene Polonskaya
(Russian astronomer)[2]
1973 SB3 · 1941 SD
1948 QH · 1966 VC
main-belt · Flora[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc67.04 yr (24,485 days)
Aphelion2.7729 AU
Perihelion1.8764 AU
2.3247 AU
3.54 yr (1,295 days)
0° 16m 41.16s / day
Known satellites1 [3][4]
Physical characteristics
Dimensions4.625±0.163 km[5][6]
4.804 km[3][7]
Mean density
1.6 g/cm3[4]
3.114±0.002 h[8]
3.11789±0.00013 h[8]
3.11809±0.00013 h[8]
3.1183 h[9]
6.69±0.01 h[10]
12.96±0.03 (R)[8] · 13.0[1] · 13.35±0.071[3][7] · 13.42[5]
S/2005 (2006) 1
Discovered byD. Pray, P. Pravec, P. Kusnirak, W. Cooney, J. Gross, and D. Terrell
Discovery date2005/11/01
Light curve
Orbital characteristics
8.5 km
0.7979 ± 0.0008 d
19 hours, 9 ± 1 minutes
13 mas (maximum)
Satellite of2006 Polonskaya
Physical characteristics
Dimensions0.99 km
Volume0.5 km3 (assumed)
6.6571 ± 0.0002 h
<3.3 fainter than primary


Classification and orbitEdit

Polonskaya is a member of the Flora family, one of the largest collisional populations of stony asteroids. It orbits the Sun in the inner main-belt at a distance of 1.9–2.8 AU once every 3 years and 6 months (1,295 days). Its orbit has an eccentricity of 0.19 and an inclination of 5° with respect to the ecliptic.[1]

Physical characteristicsEdit


Several rotational lightcurves of Polonskaya were obtained from photometric observations. Lightcurve analysis gave a rotation period between 3.114 and 3.1183 hours with a brightness amplitude of 0.18–0.10 magnitude for the best rated results (U=3/3/3/3).[8][9]

Diameter and albedoEdit

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Polonskaya measures 4.625 kilometers in diameter and its surface has an albedo of 0.354.[5][6] The Collaborative Asteroid Lightcurve Link adopts Petr Pravec's revised WISE-data, that is, an albedo of 0.3498 and a diameter of 4.80 kilometers based on an absolute magnitude of 13.35.[3][7]


In 2005, it was claimed that lightcurve observations indicate that Polonskaya has a small moon about 0.99 km in diameter.[4] However, the non-synchronously rotating binary still needs to be fully resolved in order to confirm such satellite. Alternatively, the presence of another body has also been suggested to explain the lightcurve's irregular period, which would make it a trinary asteroid.[12]


This minor planet was named after Russian astronomer Elena Ivanovna Kazimirchak-Polonskaya (1902–1992), who researched the motion and orbital evolution of comets, in particular the capture of comets by major planets. She was a member of IAU's Commission XX, and was awarded the F. A. Bredikhin prize.[2] The approved naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 4481).[13]


  1. ^ a b c d "JPL Small-Body Database Browser: 2006 Polonskaya (1973 SB3)" (2017-04-30 last obs.). Jet Propulsion Laboratory. Retrieved 29 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(2006) Polonskaya". Dictionary of Minor Planet Names – (2006) Polonskaya. Springer Berlin Heidelberg. p. 162. doi:10.1007/978-3-540-29925-7_2007. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f "LCDB Data for (2006) Polonskaya". Asteroid Lightcurve Database (LCDB). Retrieved 29 June 2017.
  4. ^ a b c Johnston, Robert. "(2006) Polonskaya". Retrieved 28 May 2015.
  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.
  6. ^ a b c 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 29 June 2017.
  7. ^ a b c d Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved 29 June 2017.
  8. ^ a b c d e Pravec, P.; Scheirich, P.; Vokrouhlický, D.; Harris, A. W.; Kusnirák, P.; Hornoch, K.; et al. (March 2012). "Binary asteroid population. 2. Anisotropic distribution of orbit poles of small, inner main-belt binaries". Icarus. 218 (1): 125–143. Bibcode:2012Icar..218..125P. doi:10.1016/j.icarus.2011.11.026. Retrieved 29 June 2017.
  9. ^ a b Pray, D.; Pravec, P.; Kusnirak, P.; Cooney, W.; Gross, J.; Terrell, D. (November 2005). "(2006) Polonskaya". IAU Circ. 8630 (8630): 3. Bibcode:2005IAUC.8630....3P. Retrieved 29 June 2017.
  10. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (2006) Polonskaya". Geneva Observatory. Retrieved 29 June 2017.
  11. ^ "2006 Polonskaya (1973 SB3)". Minor Planet Center. Retrieved 29 June 2017.
  12. ^ "IAUC 8630, 2006". CBAT–IAU Central Bureau for Astronomical Telegrams. 16 November 2005. Retrieved 23 August 2016.
  13. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 29 June 2017.

External linksEdit