7846 Setvák

7846 Setvák
Discovery [1]
Discovered by M. Tichý
Discovery site Kleť Obs.
Discovery date 16 January 1996
Designations
MPC designation 7846 Setvák
Named after
 Stáňa and Martin Setvák
(meteorologist)[2]
1996 BJ · 1979 OZ2
main-belt · Flora [3]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 36.08 yr (13,177 days)
Aphelion 2.7694 AU
Perihelion 1.9307 AU
2.3501 AU
Eccentricity 0.1784
3.60 yr (1,316 days)
173.81°
Inclination 3.4545°
291.32°
223.99°
Physical characteristics
Dimensions 2.964±0.127 km[4]
2.69 km (calculated)[3]
2.613±0.0006 h[5]
2.620±0.010 h[6]
0.3493±0.0362[4]
0.24 (assumed)[3]
S [3] · LS [7]
14.6[1]
15.01[3]
14.4[4]
14.565±0.001 (R)[5]
14.490±0.050 (R)[6]
14.97±0.27[7]

    7846 Setvák, provisional designation 1996 BJ, is a stony Flora asteroid from the inner regions of the asteroid belt, about 3 kilometers in diameter. It was discovered on 16 January 1996, by Czech astronomer Miloš Tichý at Kleť Observatory in South Bohemia.[8]

    The S-type asteroid is a member of the Flora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun at a distance of 1.9–2.8 AU once every 3 years and 7 months (1,316 days). Its orbit has an eccentricity of 0.18 and an inclination of 3° with respect to the ecliptic.[1] Its observation arc dates back to 1979, due to precoveries obtained at the U.S. Palomar Observatory and the Siding Spring Observatory in Australia.[8]

    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,[4] while the Collaborative Asteroid Lightcurve Link (CALL) 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 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.[7]

    Two rotational light-curves were obtained through photometric observations at the U.S. Palomar Transient Factory in January 2014. The light-curves gave a rotation period of 2.613 and 2.610 hours with a brightness amplitude of 0.11 and 0.14 in magnitude, respectively (U=2/2).[5][6]

    The minor planet was named in honor of Czech meteorologist Martin Setvák, head of the Satellite Department of the Czech Hydrometeorological Institute,(b. 1958), to honor his 40th birthday.[2]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 7846 Setvak (1996 BJ)" (2015-08-21 last obs.). Jet Propulsion Laboratory. Retrieved 14 April 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (7846) Setvák. Springer Berlin Heidelberg. p. 618. ISBN 978-3-540-00238-3. Retrieved 14 April 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (7846) Setvak". Asteroid Lightcurve Database (LCDB). Retrieved 14 April 2016.
    4. 1 2 3 4 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 14 April 2016.
    5. 1 2 3 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041Freely accessible. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 14 April 2016.
    6. 1 2 3 Chang, Chan-Kao; Ip, Wing-Huen; Lin, Hsing-Wen; Cheng, Yu-Chi; Ngeow, Chow-Choong; Yang, Ting-Chang; et al. (August 2015). "Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory". The Astrophysical Journal Supplement Series. 219 (2): 19. arXiv:1506.08493Freely accessible. Bibcode:2015ApJS..219...27C. doi:10.1088/0067-0049/219/2/27. Retrieved 14 April 2016.
    7. 1 2 3 Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 14 April 2016.
    8. 1 2 "7846 Setvak (1996 BJ)". Minor Planet Center. Retrieved 14 April 2016.

    External links


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