| Discovery [1] | |
|---|---|
| Discovered by | M. Tichý |
| Discovery site | Kleť Obs. |
| Discovery date | 16 January 1996 |
| Designations | |
| (7846) Setvák | |
Named after | Stáňa and Martin Setvák (Czech meteorologist)[2] |
| 1996 BJ · 1979 OZ2 | |
| main-belt · Flora [3] | |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 37.53 yr (13,707 days) |
| Aphelion | 2.7686AU |
| Perihelion | 1.9306 AU |
| 2.3496 AU | |
| Eccentricity | 0.1783 |
| 3.60yr (1,315 days) | |
| 337.86° | |
| Inclination | 3.4546° |
| 291.31° | |
| 224.12° | |
| Physical characteristics | |
| Dimensions | 2.69 km(calculated)[3] 2.964±0.127 km[4][5] |
| 2.613±0.0006h[6] 2.620±0.010 h[7] | |
| 0.24(assumed)[3] 0.349±0.036[4][5] | |
| S [3] · LS [8] | |
| 14.4[4] · 14.490±0.050(R)[7] · 14.565±0.001(R)[6] · 14.6[1] · 14.97±0.27[8] · 15.01[3] | |
7846 Setvák, provisional designation1996 BJ, is a stony Floraasteroid from the inner regions of theasteroid belt, approximately 3 kilometers in diameter. It was discovered on 16 January 1996, by Czech astronomerMiloš Tichý atKleť Observatory in South Bohemia.[9] The asteroid was named for Czech coupleStáňa andMartin Setvák.[2]
Setvák is a member of theFlora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun in theinner main-belt at a distance of 1.9–2.8 AU once every 3 years and 7 months (1,315 days). Its orbit has aneccentricity of 0.18 and aninclination of 3° with respect to theecliptic.[1] Itsobservation arc dates back to 1979, due toprecoveries obtained at the U.S.Palomar Observatory and theSiding Spring Observatory in Australia.[9]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer, the asteroid measures 3.0 kilometers in diameter and its surface has a highalbedo of 0.35,[4][5] while theCollaborative Asteroid Lightcurve Link assumes an albedo of 0.24 (in accordance with the family's largest member and namesake,8 Flora) and calculates a diameter of 2.7 kilometers.[3] A large-scale survey byPan-STARRS (PS1) assigns an LS-type, presumably an intermediaryspectral type between the common stony S-types and the rather rare and reddishL-type asteroids.[8]
Two rotationallightcurves were obtained fromphotometric observations taken in the R-band at the U.S.Palomar Transient Factory in January 2014. The lightcurves gave arotation period of 2.613 and 2.610 hours with a brightness amplitude of 0.11 and 0.14 inmagnitude, respectively (U=2/2).[6][7]
Thisminor planet was named for Czech meteorologist Martin Setvák (born 1958), amateurastrophotographer and head of the Satellite Department of theCzech Hydrometeorological Institute, to honor his 40th birthday, as well as for his wife Stáňa Setváková (born 1967), a staff member of the Prague Planetarium.[2] The official naming citation was published by theMinor Planet Center on 11 February 1998 (M.P.C. 31298).[10]
