4944 Kozlovskij

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4944 Kozlovskij
Discovery [1]
Discovered by L. Chernykh
Discovery site Crimean Astrophysical Observatory
Discovery date 2 September 1987
MPC designation (4944) Kozlovskij
Named after
Ivan Kozlovsky
(Russian opera singer)[2]
1987 RP3 · 1978 VK13
1985 DP2 · 1991 NX7
main-belt · (central)
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 65.41 yr (23,890 days)
Aphelion 2.9184 AU
Perihelion 2.5744 AU
2.7464 AU
Eccentricity 0.0626
4.55 yr (1,662 days)
0° 12m 59.76s / day
Inclination 4.4864°
Physical characteristics
Dimensions 9.25±1.11 km[3]
9.89±2.71 km[4]
9.91 km (calculated)[5]
10.85±2.35 km[6]
11.125±0.083 km[7][8]
3.573±0.0006 h[9]
0.057 (assumed)[5]
SMASS = Cb [1] · C[5]
12.80[3] · 13.1[6][7] · 13.20[4] · 13.297±0.003 (R)[9] · 13.3[1] · 13.42±0.25[10] · 13.75[5]

4944 Kozlovskij, provisional designation 1987 RP3, is a rare-type carbonaceous asteroid from the central regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 2 September 1987, by Soviet astronomer Lyudmila Chernykh at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula.[11] The asteroid was named for Russian opera singer Ivan Kozlovsky.[2]


Kozlovskij orbits the Sun in the central main-belt at a distance of 2.6–2.9 AU once every 4 years and 7 months (1,662 days). Its orbit has an eccentricity of 0.06 and an inclination of 4° with respect to the ecliptic.[1] The asteroid's observation arc begins 36 years prior to its official discovery observation, with a precovery taken at Palomar Observatory in December 1951.[11]

Physical characteristics[edit]

In the SMASS classification, Kozlovskij is a Cb-type asteroid, an intermediary between the carbonaceous C-type and rare B-type asteroids.[1]


In October 2010, a rotational lightcurve of Kozlovskij was obtained from photometric observations in the R-band by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 3.573 hours with a brightness amplitude of 0.46 magnitude (U=2).[9]

Diameter and albedo[edit]

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Kozlovskij measures 9.25 and 9.89 kilometers in diameter and its surface has an albedo of 0.157 and 0.09, respectively.[3][4] Preliminary WISE results gave a larger diameter of 10.85 and 11.125 kilometers with lower albedo of 0.086 and 0.061, respectively.[6][7][8]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 9.91 kilometers based on an absolute magnitude of 13.75.[5]


This minor planet was named after Russian opera singer Ivan Kozlovsky (1900–1993), who was a rare lyric tenor and a popular singer in the former Soviet Union.[2] The approved naming citation was published by the Minor Planet Center on 1 September 1993 (M.P.C. 22504).[12]


  1. ^ a b c d e f "JPL Small-Body Database Browser: 4944 Kozlovskij (1987 RP3)" (2017-04-28 last obs.). Jet Propulsion Laboratory. Retrieved 1 July 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (4944) Kozlovskij. Springer Berlin Heidelberg. pp. 425–426. ISBN 978-3-540-00238-3. Retrieved 1 July 2017. 
  3. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 1 July 2017. 
  4. ^ a b c d Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522Freely accessible. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 1 July 2017. 
  5. ^ a b c d e "LCDB Data for (4944) Kozlovskij". Asteroid Lightcurve Database (LCDB). Retrieved 1 July 2017. 
  6. ^ 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:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 1 July 2017. 
  7. ^ 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" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 1 July 2017. 
  8. ^ 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:1109.4096Freely accessible. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 1 July 2017. 
  9. ^ a b c Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041Freely accessible. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 1 July 2017. 
  10. ^ 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 1 July 2017. 
  11. ^ a b "4944 Kozlovskij (1987 RP3)". Minor Planet Center. Retrieved 1 July 2017. 
  12. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 1 July 2017. 

External links[edit]