| Discovery[1] | |
|---|---|
| Discovered by | P. Jensen |
| Discovery site | Brorfelde Obs. |
| Discovery date | 3 October 1986 |
| Designations | |
| (3782) Celle | |
Named after | Celle(German city)[1] |
| 1986 TE · 1970 HD 1972 YP · 1973 AV 1978 NH2 · 1982 OB 1985 GR1 | |
| main-belt[1][2] · (inner) Vesta[3][4] | |
| Orbital characteristics[2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 47.74yr (17,437 d) |
| Aphelion | 2.6414AU |
| Perihelion | 2.1888 AU |
| 2.4151 AU | |
| Eccentricity | 0.0937 |
| 3.75 yr (1,371 d) | |
| 247.56° | |
| 0° 15m 45.36s / day | |
| Inclination | 5.2493° |
| 271.35° | |
| 334.33° | |
| Knownsatellites | 1(D:2.34 km;P:36.57 h)[5][6] |
| Physical characteristics | |
| 5.924±0.230 km[7][8] 6.35 km(calculated)[3] 6.50±0.49 km[9] 6.6±0.7 km[10] | |
Meandensity | 2.2±0.4 g/cm3(binary)[11] |
| 3.8389±0.0007 h[12] 3.840±0.001 h[13] 3.840±0.0012 h[14] 3.84 h[11] 3.84 h[6] | |
| 0.232±0.09[10] 0.418±0.072[9] 0.4(assumed)[3] 0.5033±0.0778[8] | |
| SMASS =V[2][3] · V[15] V–I =0.880±0.050[10] | |
| 12.50[8][9] 12.537±0.003(R)[14] 12.6[2][3] 13.12±0.12[10] 13.15±1.41[15] | |
3782 Celle, provisional designation1986 TE, is a bright Vestianasteroid and asynchronousbinary system from the inner regions of theasteroid belt, approximately 6.5 kilometers (4 miles) in diameter. It was discovered on 3 October 1986, by Danish astronomerPoul Jensen at theBrorfelde Observatory in Denmark and named after the German city ofCelle.[1] TheV-type asteroid has arotation period of 3.84 hours.[3] The discovery of its 2.3-kilometerminor-planet moon was announced in 2003.[5][6]
Celle is a core member of theVesta family (401), one of the largestfamilies in main belt.[3][4] Vestian asteroids have a composition akin to cumulateeucrites (HED meteorites) and are thought to have originated deep within4 Vesta's crust, possibly from theRheasilvia crater, a largeimpact crater on its southern hemisphere near the South pole, formed as a result of a subcatastrophic collision. Vesta is the main belt'ssecond-largest andsecond-most-massive body afterCeres.[16][17]
Celle orbits the Sun in theinner asteroid belt at a distance of 2.2–2.6 AU once every 3 years and 9 months (1,371 days;semi-major axis of 2.42 AU). Its orbit has aneccentricity of 0.09 and aninclination of 5° with respect to theecliptic.[2] The body'sobservation arc begins with its first observations as1970 HD atCrimea–Nauchnij in April 1970, about 16 years prior to its official discovery observation at Brorfelde.[1]
Celle is a brightV-type asteroid in theSMASS classification and according to the characterization made by thePan-STARRS survey.[2][3][15] This is also in line with the overallspectral type determined for Vestian asteroids.[16]: 23
Several rotationallightcurves of Celle have been obtained fromphotometric observations since 2001.[6][12][13][14][11] Analysis of the best-rated lightcurves gave arotation period of 3.84 hours with a brightness amplitude between 0.11 and 0.17magnitude (U=2/3-/3/3).[3]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer, Celle measures between 5.924 and 6.6 kilometers in diameter and its surface has analbedo between 0.232 and 0.5033.[7][8][9][10]
TheCollaborative Asteroid Lightcurve Link assumes a high albedo of 0.4 and calculates a diameter of 6.35 kilometers based on anabsolute magnitude of 12.6.[3]
Between September 2001, and February 2003, photometric observations of Celle were obtained with the 1.8-meterVatican Advanced Technology Telescope on Mount Graham, Arizona, by American astronomersWilliam Ryan atNew Mexico Tech andNMHU in collaboration withCarlos Martinez andLacey Stewart as part of a larger survey.[6]
The mutualoccultation events revealed that Celle is an asynchronousbinary asteroid with aminor-planet moon orbiting it every 36.57 hours (1.52 days) at an average distance of18±1 km. The discovery was announced on 3 May 2003.[6] The satellite measures approximately2.34±0.11 km or 43% the size of its primary. A combined bulk density of2.2±0.4 g/cm3 was modeled for the likely basaltic bodies.[5][11]
Thisminor planet was named after the German city ofCelle on the occasion of its 700th anniversary. Celle is twinned with the Danish town ofHolbæk, where the discoveringBrorfelde Observatory is located.[1] The official naming citation was published by theMinor Planet Center on 18 February 1992 (M.P.C. 19693).[18]
