| Minorplanet: | yes |
| 7846 Setvák | |
| Background: |
|
| Discovery Ref: |   |
| Discovered: | 16 January 1996 |
| Mpc Name: | (7846) Setvák |
| Alt Names: | 1996 BJ |
| Named After: | |
| Mp Category: | main-beltFlora  |
| Orbit Ref: |   |
| Epoch: | 4 September 2017 (JD 2458000.5) |
| Uncertainty: | 0 |
| Observation Arc: | 37.53 yr (13,707 days) |
| Perihelion: | 1.9306 AU |
| Semimajor: | 2.3496 AU |
| Eccentricity: | 0.1783 |
| Period: | 3.60 yr (1,315 days) |
| Inclination: | 3.4546° |
| Asc Node: | 291.31° |
| Arg Peri: | 224.12° |
| Dimensions: | 2.69 km km |
| Rotation: | h h |
| Albedo: | 0.24 |
| Spectral Type: | S LS  |
| Abs Magnitude: | 14.4 14.615.01 |
7846 Setvák, provisional designation, is a stony Flora asteroid from the inner regions of the asteroid belt, approximately 3 kilometers in diameter. It was discovered on 16 January 1996, by Czech astronomer Miloš Tichý at Kleť Observatory in South Bohemia. The asteroid was named for Czech couple Stáňa and Martin Setvák.
Setvák is a member of the Flora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun in the inner main-belt at a distance of 1.9–2.8 AU once every 3 years and 7 months (1,315 days). Its orbit has an eccentricity of 0.18 and an inclination of 3° with respect to the ecliptic. Its observation arc dates back to 1979, due to precoveries obtained at the U.S. Palomar Observatory and the Siding Spring Observatory in Australia.
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 3.0 kilometers in diameter and its surface has a high albedo of 0.35, while the Collaborative 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. A large-scale survey by Pan-STARRS (PS1) assigns an LS-type, presumably an intermediary spectral type between the common stony S-types and the rather rare and reddish L-type asteroids.
Two rotational lightcurves were obtained from photometric observations taken in the R-band at the U.S. Palomar Transient Factory in January 2014. The lightcurves gave a rotation period of 2.613 and 2.610 hours with a brightness amplitude of 0.11 and 0.14 in magnitude, respectively .
This minor planet was named for Czech meteorologist Martin Setvák (born 1958), amateur astrophotographer and head of the Satellite Department of the Czech Hydrometeorological Institute, to honor his 40th birthday, as well as for his wife Stáňa Setváková (born 1967), a staff member of the Prague Planetarium. The official naming citation was published by the Minor Planet Center on 11 February 1998 .