2637 Bobrovnikoff

2637 Bobrovnikoff, provisional designation A919 SB, is a background asteroid from the inner regions of the asteroid belt, approximately 6 kilometers (4 miles) in diameter. It was discovered on 22 September 1919, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in Heidelberg, Germany.[1] The presumed spherical S-type asteroid has a rotation period of 4.79 hours.[3] It is named after astronomer Nicholas Bobrovnikoff, who was the director of the Perkins Observatory in Ohio, United States.[1]

2637 Bobrovnikoff
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date22 September 1919
MPC designation(2637) Bobrovnikoff
Named after
Nicholas T. Bobrovnikoff [1]
(Russian-born astronomer)
A919 SB · 1953 TL
1963 RB · 1976 JB7
1980 TN3
main-belt[1][2] · (inner)[3]
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc98.35 yr (35,922 d)
Aphelion2.7846 AU
Perihelion1.7257 AU
2.2551 AU
3.39 yr (1,237 d)
0° 17m 27.6s / day
Physical characteristics
Mean diameter
5.82±0.95 km[5]
5.97±1.05 km[6]
6.21±0.10 km[7]
6.919±0.094 km[8]
7.46 km (calculated)[3]
4.7939±0.0003 h[9]
0.20 (assumed)[3]
S (assumed)[3]
12.90[6][7][8] · 13.0[2][3]
13.31±0.39[10] · 13.40[5]

Orbit and classificationEdit

Bobrovnikoff is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the inner asteroid belt at a distance of 1.7–2.8 AU once every 3 years and 5 months (1,237 days; semi-major axis of 2.26 AU). Its orbit has an eccentricity of 0.23 and an inclination of 5° with respect to the ecliptic.[2] The body's observation arc begins at Heidelberg in 1919, three days after its official discovery observation.[1]

Physical characteristicsEdit

Bobrovnikoff is an assumed, stony S-type asteroid.[3]

Rotation periodEdit

In September 2007, a rotational lightcurve of Bobrovnikoff was obtained from photometric observations by French and Swiss astronomers Pierre Antonini, Raoul Behrend, and Alain Klotz. Lightcurve analysis gave a well-defined rotation period of 4.7939 hours with a brightness amplitude of 0.13 magnitude, indicative of a rather spherical shape (U=3).[9]

Diameter and albedoEdit

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Bobrovnikoff measures between 5.82 and 6.919 kilometers in diameter and its surface has an albedo between 0.2563 and 0.37.[5][6][7][8]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a larger diameter of 7.46 kilometers based on an absolute magnitude of 13.0.[3]


This minor planet was named after Russian-born cometary spectroscopist Nicholas Theodore Bobrovnikoff (1896–1988), known for his research on the 1910-apparition of Halley's Comet. From 1934 to 1951, he was the director of the Perkins Observatory in Delaware, Ohio. The naming was proposed by the director of Minor Planet Center, Brian G. Marsden, and the official citation was published on 24 July 1983 (M.P.C. 8064).[1][11]


  1. ^ a b c d e f g "2637 Bobrovnikoff (A919 SB)". Minor Planet Center. Retrieved 6 April 2018.
  2. ^ a b c d "JPL Small-Body Database Browser: 2637 Bobrovnikoff (A919 SB)" (2018-01-27 last obs.). Jet Propulsion Laboratory. Retrieved 6 April 2018.
  3. ^ a b c d e f g h "LCDB Data for (2637) Bobrovnikoff". Asteroid Lightcurve Database (LCDB). Retrieved 6 April 2018.
  4. ^ a b "Asteroid 2637 Bobrovnikoff – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
  5. ^ a b c d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63.
  6. ^ 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:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117.
  7. ^ 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.
  8. ^ 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.
  9. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (2637) Bobrovnikoff". Geneva Observatory. Retrieved 6 April 2018.
  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:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007.
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 6 April 2018.

External linksEdit