2120 Tyumenia

2120 Tyumenia (prov. designation: 1967 RM) is a dark background asteroid, approximately 45 kilometers (28 miles) in diameter, located in the outer regions of the asteroid belt. It was discovered on 9 September 1967, by Soviet astronomer Tamara Smirnova at the Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula.[15] The asteroid was named for the now Russian district of Tyumen Oblast in Western Siberia.[2]

2120 Tyumenia
Shape model of Tyumenia from its lightcurve
Discovery [1]
Discovered byT. Smirnova
Discovery siteCrimean Astrophysical Obs.
Discovery date9 September 1967
Designations
(2120) Tyumenia
Named after
Tyumen Oblast [2]
(Western Siberia)
1967 RM · 1941 WS
1971 KA
main-belt · (outer) [3]
background [4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc75.96 yr (27,746 days)
Aphelion3.4494 AU
Perihelion2.6682 AU
3.0588 AU
Eccentricity0.1277
5.35 yr (1,954 days)
162.29°
0° 11m 3.12s / day
Inclination17.573°
222.46°
75.509°
Physical characteristics
Mean diameter
38.619±0.412 km[5]
40.93 km (derived)[3]
41.18±2.4 km[6]
43.65±20.27 km[7]
43.90±0.80 km[8]
47.00±14.23 km[9]
51.485±0.395 km[10]
2.769±0.001 h[11][lower-alpha 1]
17.47±0.07 h[12]
17.507±0.006 h[13]
0.029±0.005[10]
0.03±0.02[7]
0.03±0.03[9]
0.0420 (derived)[3]
0.064±0.003[8]
0.068±0.003[14]
0.0721±0.009[6]
0.0819±0.0132[5]
C (assumed)[3]
10.40[5][6][8] · 10.90[9][10] · 11.0[1][3] · 11.14[7]

    Orbit and classification

    Tyumenia is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the outer asteroid belt at a distance of 2.7–3.4 AU once every 5 years and 4 months (1,954 days; semi-major axis of 3.06 AU). Its orbit has an eccentricity of 0.13 and an inclination of 18° with respect to the ecliptic.[1] The body's observation arc begins with its identification as 1941 WS at Turku Observatory in November 1941, almost 26 years prior to its official discovery observation at Nauchnyj.[15]

    Naming

    This minor planet was named after the district of Tyumen Oblast of the former Russian Soviet Federative Socialist Republic (1917–1991). Tyumen Oblast is located east of the Ural Mountains in Western Siberia, in the center of an oil-gas basin.[2] The region is Russia's largest producer of oil and natural gas. The official naming citation was published by the Minor Planet Center on 1 April 1980 (M.P.C. 5283).[16]

    Physical characteristics

    Tyumenia is an assumed carbonaceous C-type asteroid.[3]

    Rotation period

    Three rotational lightcurves of Tyumenia have been obtained from photometric observations since 2004.(U=2/2/2).[11][12][13] The consolidated lightcurve gave a short rotation period of 2.769 hours with a brightness amplitude between 0.33 and 0.39 magnitude.[3][lower-alpha 1]

    Diameter and albedo

    According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Tyumenia measures between 38.619 and 51.49 kilometers in diameter and its surface has an albedo between 0.029 and 0.0819.[5][6][7][8][9][10][14] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0420 and a diameter of 40.93 kilometers based on an absolute magnitude of 11.0.[3]

    Notes
    1. Lightcurve plot of 2120 Tyumenia, Palmer Divide Observatory, B. D. Warner (2004) yxz () web: rotation period 2.769±0.001 hours with a brightness amplitude of 0.33±0.02 mag. Quality Code of 2. Summary figures at the LCDB

    References
    1. "JPL Small-Body Database Browser: 2120 Tyumenia (1967 RM)" (2017-11-01 last obs.). Jet Propulsion Laboratory. Retrieved 5 December 2017.
    2. Schmadel, Lutz D. (2007). "(2120) Tyumenia". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 172. doi:10.1007/978-3-540-29925-7_2121. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (2120) Tyumenia". Asteroid Lightcurve Database (LCDB). Retrieved 5 December 2017.
    4. "Asteroid 2120 Tyumenia – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
    5. 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. Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
    7. 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. Retrieved 5 December 2017.
    8. 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 17 October 2019. (online, AcuA catalog p. 153)
    9. 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. Retrieved 5 December 2017.
    10. 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. Retrieved 5 December 2017.
    11. Warner, Brian D. (March 2005). "Lightcurve analysis for asteroids 242, 893, 921, 1373, 1853, 2120, 2448 3022, 6490, 6517, 7187, 7757, and 18108" (PDF). Minor Planet Bulletin. 32 (1): 4–7. Bibcode:2005MPBu...32....4W. ISSN 1052-8091. Retrieved 18 March 2020.
    12. Oliver, Robert Lemke; Shipley, Heath; Ditteon, Richard (October 2008). "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2008 March" (PDF). Minor Planet Bulletin. 35 (4): 149–150. Bibcode:2008MPBu...35..149O. ISSN 1052-8091. Retrieved 18 March 2020.
    13. Pligge, Zachary; Hall, Ben; Ditteon, Richard (July 2011). "Asteroid Lightcurve Analysis at the Oakley Observatory: 2010 September thru October" (PDF). Minor Planet Bulletin. 38 (3): 137–138. Bibcode:2011MPBu...38..137P. ISSN 1052-8091. Retrieved 18 March 2020.
    14. 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:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121.
    15. "2120 Tyumenia (1967 RM)". Minor Planet Center. Retrieved 5 December 2017.
    16. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 5 December 2017.
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