2726 Kotelnikov

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2726 Kotelnikov
Discovery [1]
Discovered byN. Chernykh
Discovery siteCrimean Astrophysical Obs.
Discovery date22 September 1979
MPC designation(2726) Kotelnikov
Named after
Vladimir Kotelnikov[1]
(Soviet radar astronomer)
1979 SE9 · 1952 BR1
1955 UK1 · 1969 RC1
1972 GJ1 · 1974 SH1
1974 TN · A906 QE
main-belt[1][2] · (outer)
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc63.24 yr (23,100 d)
Aphelion3.0746 AU
Perihelion2.6429 AU
2.8588 AU
4.83 yr (1,765 d)
0° 12m 14.04s / day
Physical characteristics
Mean diameter
9.85 km (calculated)[3]
10.937±0.207 km[5][6]
4.752±0.0034 h[7]
4.9075 h[3]
4.9078±0.0002 h[8]
0.24 (assumed)[3]
L/S[9] · S (SDSS-MFB)[a][3]
11.990±0.002 (R)[7]

2726 Kotelnikov, provisional designation 1979 SE9, is a stony Koronian asteroid from the outer regions of the asteroid belt, approximately 10 kilometers (6.2 miles) in diameter. It was discovered on 22 September 1979, by Soviet astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnij on the Crimean peninsula.[1] The S-type asteroid has a rotation period of 4.91 hours and is a suspected binary system.[3][8] The asteroid was named for Soviet scientist and pioneer in radar astronomy, Vladimir Kotelnikov.[1]

Orbit and classification[edit]

Kotelnikov is a member of the Koronis family (605),[3][4] a very large family of stony asteroids with nearly co-planar ecliptical orbits, named after 158 Koronis.[10]

It orbits the Sun in the outer main-belt at a distance of 2.6–3.1 AU once every 4 years and 10 months (1,765 days; semi-major axis of 2.86 AU). Its orbit has an eccentricity of 0.08 and an inclination of 2° with respect to the ecliptic.[2]

The asteroid was first observed as A906 QE at Heidelberg Observatory in August 1906. The body's observation arc begins with a precovery taken at Palomar Observatory in June 1954, or 25 years prior to its official discovery observation at Nauchnij.[1]

Physical characteristics[edit]

Kotelnikov has been characterized as both a common S- and uncommon L-type asteroid by Pan-STARRS' photometric survey,[9] while in the SDSS-MFB (Masi Foglia Binzel) taxonomy, it is classified as a stony S-type asteroid.[3][a]

Rotation period[edit]

In October 2013, a rotational lightcurve of Kotelnikov was obtained from photometric observations in the R-band by astronomers with the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 4.752 hours with a brightness variation of 0.26 magnitude (U=2).[7] In March 2015, Swiss and French astronomers René Roy, Raoul Behrend and José De Queiroz measured a period of 4.9078 hours and an amplitude of 0.21 magnitude (U=2). The astronomers noted that Kotelnikov is likely a binary asteroid, yet more observations are required.[8] The Collaborative Asteroid Lightcurve Link does not mention the asteroid's suspected binary status and consolidates a period of 4.9075 hours with an amplitude of 0.21 to 0.26.[3]

Diameter and albedo[edit]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Kotelnikov measures 10.937 kilometers in diameter and its surface has an albedo of 0.213,[5][6] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 and calculates a diameter of 9.85 kilometers based on an absolute magnitude of 12.2.[3]


This minor planet was named after Soviet scientist Vladimir Kotelnikov (1908–2005), who pioneered radar astronomy in the Soviet Union. He was a long-time director of the Institute of Radio-engineering and Electronics and vice-president of the former USSR Academy of Science. The official naming citation was published by the Minor Planet Center on 8 November 1984 (M.P.C. 9214).[11]


  1. ^ a b Search for Unusual Spectroscopic Candidates Among 40313 minor planets from the 3rd Release of the Sloan Digital Sky Survey Moving Object Catalog (publication). SDSS-MFB (Masi Foglia Binzel) taxonomy (catalog).


  1. ^ a b c d e f "2726 Kotelnikov (1979 SE9)". Minor Planet Center. Retrieved 26 April 2018.
  2. ^ a b c d "JPL Small-Body Database Browser: 2726 Kotelnikov (1979 SE9)" (2017-09-27 last obs.). Jet Propulsion Laboratory. Retrieved 26 April 2018.
  3. ^ a b c d e f g h i j k "LCDB Data for (2726) Kotelnikov". Asteroid Lightcurve Database (LCDB). Retrieved 26 April 2018.
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 26 April 2018.
  5. ^ 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 26 April 2018.
  6. ^ 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:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 26 April 2018.
  7. ^ 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" (PDF). The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 26 April 2018.
  8. ^ a b c Behrend, Raoul. "Asteroids and comets rotation curves – (2726) Kotelnikov". Geneva Observatory. Retrieved 26 April 2018.
  9. ^ a b c 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" (PDF). Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 26 April 2018.
  10. ^ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families" (PDF). Asteroids IV: 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. Retrieved 26 April 2018.
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 26 April 2018.

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