| Discovery[1] | |
|---|---|
| Discovered by | M. F. Wolf |
| Discovery site | Heidelberg Obs. |
| Discovery date | 24 January 1906 |
| Designations | |
| (2443) Tomeileen | |
Named after | parents of British astronomerBrian G. Marsden[1] |
| A906 BJ · 1927 DD 1934 PS · 1949 MV 1950 RD1 · 1950 TF3 1953 CH · 1953 EO 1957 WH · 1959 JR 1961 TE1 · 1961 TW1 1965 OE · 1974 DQ1 1974 FC1 · 1981 NN1 | |
| main-belt[1][2] · (outer) Eos[3][4][5] | |
| Orbital characteristics[2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 111.76yr (40,821 d) |
| Aphelion | 3.1804AU |
| Perihelion | 2.8297 AU |
| 3.0050 AU | |
| Eccentricity | 0.0584 |
| 5.21 yr (1,903 d) | |
| 138.10° | |
| 0° 11m 21.12s / day | |
| Inclination | 11.444° |
| 118.77° | |
| 68.441° | |
| Physical characteristics | |
| 28.44±0.76 km[6] 30.89±1.6 km[7] 31.878±0.412 km[8] 34.07±0.65 km[9] 37.577±0.236 km[10] | |
| 3.974 h[5] 4.0±0.1 h[a] 6.822±0.001 h[11] | |
| 0.1042±0.0091[10] 0.127±0.005[9] 0.1539(derived)[3] 0.1541±0.017[7] 0.199±0.025[6] | |
| S(SDSS-MFB)[3][b] | |
| 10.10[6] · 10.20[2][3][7][9][10] 10.34±0.41[12] | |
2443 Tomeileen, provisional designationA906 BJ, is a stony Eoanasteroid from the outer regions of theasteroid belt, approximately 32 kilometers (20 miles) in diameter. It was discovered on 24 January 1906, by German astronomerMax Wolf at theHeidelberg-Königstuhl State Observatory in Heidelberg, Germany. TheS-type asteroid was named after the parents of British astronomerBrian G. Marsden.[1] It has arotation period of 3.97 hours.[3]
Tomeileen is a member theEos family (606),[3][4] the largestasteroid family of theouter main belt consisting of nearly 10,000 asteroids.[13] It orbits the Sun in theouter main-belt at a distance of 2.8–3.2 AU once every 5 years and 3 months (1,903 days;semi-major axis of 3.01 AU). Its orbit has aneccentricity of 0.06 and aninclination of 11° with respect to theecliptic.[2] The body'sobservation arc begins with its official discovery observation at Heidelberg in January 1906.[1]
Tomeileen has been characterized as a stonyS-type asteroid in theSDSS-MFB (Masi Foglia Binzel) taxonomy.[3][b]
Between 2004 and 2010, three rotationallightcurves ofTomeileen were obtained from photometric observations by Brazilian and Argentine astronomers,[5] Amadeo Aznar at Puzol Observatory (J42),[a] andLaurent Bernasconi in France.[11] Lightcurve analysis gave arotation period of 3.974, 4.0 and 6.822 hours with a brightness amplitude of 0.1, 0.10 and 0.13magnitude, respectively (U=2/2/2).[3] A low amplitude is indicative of a spherical rather than elongated shape.
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Tomeileen measures between 28.44 and 37.577 kilometers in diameter and its surface has analbedo between 0.1042 and 0.199.[6][7][8][9][10]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.1539 and a diameter of kilometers based on anabsolute magnitude of 10.2.[3]
Thisminor planet was named after Thomas Marsden (1905–1980) and Eileen (née West) Marsden (1905–1981), the parents of British astronomer and longtime director of theMinor Planet Center (MPC),Brian G. Marsden (1937–2010).[1] The official naming citation was published by the MPC on 8 April 1982 (M.P.C. 6833).[14]
