_Tselina.png) Shape model of Tselina from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | T. Smirnova |
| Discovery site | Crimean Astrophysical Obs. |
| Discovery date | 13 June 1969 |
| Designations | |
| (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) Eos[3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 48.47 yr (17,703 days) |
| Aphelion | 3.3041AU |
| Perihelion | 2.7299 AU |
| 3.0170 AU | |
| Eccentricity | 0.0952 |
| 5.24yr (1,914 days) | |
| 318.00° | |
| 0° 11m 17.16s / day | |
| Inclination | 10.503° |
| 167.17° | |
| 232.54° | |
| Physical characteristics | |
| 22.773±0.247 km[5] 22.830±0.208 km[6] 24.54±2.8 km[7] 33.02±0.64 km[8] | |
| 6.563±0.001 h[9] | |
| 0.130±0.006[8] 0.1938±0.054[7] 0.2258±0.0251[6] 0.226±0.027[10] | |
| Tholen =S[1] · S[3] B–V = 0.799[1] U–B = 0.463[1] | |
| 10.45[1][3][6][8] · 10.730±0.001(R)[11] | |
2111 Tselina (prov. designation:1969 LG) is a stonyEos asteroid from the outer regions of theasteroid belt. It was discovered on 13 June 1969, by Soviet astronomerTamara Smirnova atCrimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula.[12] TheS-type asteroid has arotation period of 6.6 hours and measures approximately 23 kilometers (14 miles) in diameter. It was later named after the SovietVirgin Lands Campaign.[2]
Tselina is a member of theEos family (606), the largestasteroid family in theouter main belt consisting of nearly 10,000 asteroids.[4][13]: 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 aneccentricity of 0.10 and aninclination of 11° with respect to theecliptic.[1] In 1929, Tselina was first observed as1928 RS and1928 SO by the German and Belgian observatories atHamburg andUccle, respectively. The body'sobservation arc begins at the discovering observatory in 1968, or one year prior to its official discovery.[12]
Thisminor planet was named afterthe tselina lands to commemorate the 25th anniversary of the SovietVirgin Lands Campaign.[2] The campaign was launched byNikita 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 theMinor Planet Center on 1 April 1980 (M.P.C.5283).[14]
In theTholen classification, Tselina is a common, stonyS-type asteroid.[1]
In September 2001, a rotationallightcurve of Tselina was obtained fromphotometric observations by French amateur astronomerLaurent Bernasconi. Lightcurve analysis gave a well-definedrotation period of6.563±0.001 hours with a brightness variation of 0.17magnitude (U=3).[9] In September 2012, observations by astronomers at thePalomar Transient Factory, California, gave a concurring period of6.562±0.0021 hours with an amplitude of 0.29 magnitude (U=2).[11]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite, and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission, Tselina measures between 22.773 and 33.02 kilometers in diameter and its surface has analbedo between 0.13 and 0.226.[5][6][7][8][10] TheCollaborative 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 anabsolute magnitude of 10.45.[3]
