_Tyumenia.png) Shape model ofTyumenia from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | T. Smirnova |
| Discovery site | Crimean Astrophysical Obs. |
| Discovery date | 9 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 arc | 75.96 yr (27,746 days) |
| Aphelion | 3.4494AU |
| Perihelion | 2.6682 AU |
| 3.0588 AU | |
| Eccentricity | 0.1277 |
| 5.35yr (1,954 days) | |
| 162.29° | |
| 0° 11m 3.12s / day | |
| Inclination | 17.573° |
| 222.46° | |
| 75.509° | |
| Physical characteristics | |
| 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][a] 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] | |
2120 Tyumenia (prov. designation:1967 RM) is a darkbackground asteroid, approximately 45 kilometers (28 miles) in diameter, located in the outer regions of theasteroid belt. It was discovered on 9 September 1967, by Soviet astronomerTamara Smirnova at theCrimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula.[15] The asteroid was named for the now Russian district ofTyumen Oblast in Western Siberia.[2]
Tyumenia is a non-family asteroid from the main belt'sbackground population.[4] It orbits the Sun in theouter 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 aneccentricity of 0.13 and aninclination of 18° with respect to theecliptic.[1] The body'sobservation arc begins with its identification as1941 WS atTurku Observatory in November 1941, almost 26 years prior to its official discovery observation at Nauchnyj.[15]
Thisminor planet was named after the district ofTyumen Oblast of the formerRussian Soviet Federative Socialist Republic (1917–1991). Tyumen Oblast is located east of theUral 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 theMinor Planet Center on 1 April 1980 (M.P.C. 5283).[16]
Tyumenia is an assumed carbonaceousC-type asteroid.[3]
Three rotationallightcurves ofTyumenia have been obtained from photometric observations since 2004.(U=2/2/2).[11][12][13] The consolidated lightcurve gave a shortrotation period of 2.769 hours with a brightness amplitude between 0.33 and 0.39magnitude.[3][a]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Tyumenia measures between 38.619 and 51.49 kilometers in diameter and its surface has analbedo between 0.029 and 0.0819.[5][6][7][8][9][10][14] TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.0420 and a diameter of 40.93 kilometers based on anabsolute magnitude of 11.0.[3]
