2111 Tselina

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2111 Tselina
Discovery [1]
Discovered by T. Smirnova
Discovery site Crimean Astrophysical Obs.
Discovery date 13 June 1969
MPC designation (2111) Tselina
Named after
Virgin Lands Campaign
(agricultural program)[2]
1969 LG · 1928 RS
1928 SO · 1951 AR1
1968 HB1 · 1975 RE
1976 YF
main-belt · (outer)
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 48.47 yr (17,703 days)
Aphelion 3.3041 AU
Perihelion 2.7299 AU
3.0170 AU
Eccentricity 0.0952
5.24 yr (1,914 days)
0° 11m 17.16s / day
Inclination 10.503°
Physical characteristics
Dimensions 22.773±0.247 km[5]
22.830±0.208 km[6]
24.54±2.8 km[7]
33.02±0.64 km[8]
6.562±0.0021 h[9]
6.563±0.001 h[10]
Tholen = S[1] · S[3]
B–V = 0.799 [1]
U–B = 0.463 [1]
10.28±0.34[12] · 10.45[1][3][6][8] · 10.730±0.001 (R)[9]

2111 Tselina, provisional designation 1969 LG, is a stony Eoan asteroid from the outer regions of the asteroid belt, approximately 23 kilometers in diameter. It was discovered on 13 June 1969, by Soviet astronomer Tamara Smirnova at Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula.[13] It was later named after the Soviet Virgin Lands Campaign.[2]

Orbit and classification[edit]

Tselina is a member of the Eos family (606), the largest asteroid family in the outer main belt consisting of nearly 10,000 asteroids.[4][14]:23 It orbits the Sun at a distance of 2.7–3.3 AU once every 5 years and 3 months (1,914 days). Its orbit has an eccentricity of 0.10 and an inclination of 11° with respect to the ecliptic.[1]

In 1929, Tselina was first observed as 1928 RS and 1928 SO by the German and Belgian observatories at Hamburg and Uccle, respectively. The body's observation arc begins at the discovering observatory in 1968, or one year prior to its official discovery.[13]

Physical characteristics[edit]

In the Tholen classification, Tselina is a common stony S-type asteroid.[1]

Rotation period[edit]

In September 2001, a rotational lightcurve of Tselina was obtained by French amateur astronomer Laurent Bernasconi. Lightcurve analysis gave a well-defined rotation period of 6.563 hours with a brightness variation of 0.17 magnitude (U=3).[10] In September 2012, photometric observations by astronomers at the Palomar Transient Factory, California, gave a concurring period of 6.562 hours with an amplitude of 0.29 magnitude (U=2).[9]

Diameter and albedo[edit]

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Tselina measures between 22.773 and 33.02 kilometers in diameter and its surface has an albedo between 0.13 and 0.226.[5][6][7][8][11]

The Collaborative Asteroid Lightcurve Link agrees with the results obtained by IRAS, that is, an albedo of 0.1938 and a diameter of 24.54 kilometers with an absolute magnitude of 10.45.[3]


This minor planet was named after the tselina lands to commemorate the 25th anniversary of the Soviet Virgin Lands Campaign.[2] The campaign was launched by Nikita Khrushchev in 1953, with the intention to significantly increase the agricultural production in the USSR. The word "tselina" (or tseliny) means "virgin soil". The official naming citation was published by the Minor Planet Center on 1 April 1980 (M.P.C. 5283).[15]


  1. ^ a b c d e f g h "JPL Small-Body Database Browser: 2111 Tselina (1969 LG)" (2016-10-14 last obs.). Jet Propulsion Laboratory. Retrieved 3 July 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (2111) Tselina. Springer Berlin Heidelberg. p. 171. ISBN 978-3-540-00238-3. Retrieved 28 April 2017. 
  3. ^ a b c d "LCDB Data for (2111) Tselina". Asteroid Lightcurve Database (LCDB). Retrieved 28 April 2017. 
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 21 November 2017. 
  5. ^ a b Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 29 April 2017. 
  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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 28 April 2017. 
  7. ^ a b c Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 28 April 2017. 
  8. ^ 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 28 April 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 28 April 2017. 
  10. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (2111) Tselina". Geneva Observatory. Retrieved 28 April 2017. 
  11. ^ a b 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 28 April 2017. 
  12. ^ 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 28 April 2017. 
  13. ^ a b "2111 Tselina (1969 LG)". Minor Planet Center. Retrieved 28 April 2017. 
  14. ^ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families" (PDF). Asteroids IV: 297–321. arXiv:1502.01628Freely accessible. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. Retrieved 21 November 2017. 
  15. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 28 April 2017. 

External links[edit]