21873 Jindřichůvhradec

21873 Jindřichůvhradec
Discovery [1]
Discovered by J. Tichá
M. Tichý
Discovery site Kleť Obs.
Discovery date 29 October 1999
Designations
MPC designation 21873 Jindřichůvhradec
Named after
 Jindřichův Hradec
(Czech town)[2]
1999 UU3 · 1982 SN8
1988 XA5
main-belt · (outer) [3]
Orbital characteristics [1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 34.15 yr (12,472 days)
Aphelion 3.8050 AU
Perihelion 2.5002 AU
3.1526 AU
Eccentricity 0.2069
5.60 yr (2,045 days)
54.122°
0° 10m 33.96s / day
Inclination 4.4631°
238.02°
130.96°
Physical characteristics
Dimensions 7.183±0.136 km[4][5]
10.44 km (calculated)[3]
50.5874±0.0664 h[6]
0.057 (assumed)[3]
0.237±0.088[4][5]
C [3] · X [7]
12.9[4] · 12.90±0.17[7] · 13.1[1] · 13.184±0.005 (R)[6] · 13.63[3]

    21873 Jindřichůvhradec, provisional designation 1999 UU3, is a dark asteroid and relatively slow rotator from the outer region of the asteroid belt, approximately 8 kilometers in diameter. It was discovered by Czech astronomers Jana Tichá and Miloš Tichý at the South Bohemian Kleť Observatory on 29 October 1999.[8]

    The asteroid orbits the Sun at a distance of 2.5–3.8 AU once every 5 years and 7 months (2,045 days). Its orbit has an eccentricity of 0.21 and an inclination of 4° with respect to the ecliptic.[1] The first precovery was obtained at Crimea–Nauchnij in 1982, extending the asteroid's observation arc by 17 years prior to its discovery.[8]

    According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, the asteroid measures 7.2 kilometers in diameter and its surface has an albedo of 0.23.[4] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous C-type asteroids of 0.057, and calculates a diameter of 10.4 kilometers, as the lower the albedo, the larger a body's diameter, at a constant absolute magnitude.[3] A large-scale survey by Pan-STARRS, however, classifies the body as a X-type asteroid, which metallic core group has an intermediate albedo between stony and carbonaceous bodies.[7] In September 2010, a photometric light-curve analysis at the U.S. Palomar Transient Factory, California, gave a long rotation period of 50.5874±0.0664 hours with a brightness variation of 0.61 in magnitude (U=2).[6] This makes it a relatively slow rotator for an asteroid of its size, which normally have periods of just a few hours rather than several days.

    The minor planet is named for Jindřichův Hradec, a south Bohemian town in the Czech Republic. Founded in the 13th century, it is known for its Renaissance château and Gothic church, which is exactly built on the 15th meridian east of Greenwich. A line marks the course of the meridian in its paving stones.[2] Naming citation was published on 28 January 2002 (M.P.C. 44595).[9]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 21873 Jindrichuvhradec (1999 UU3)" (2016-11-11 last obs.). Jet Propulsion Laboratory. Retrieved 3 December 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (21873) Jindřichůvhradec. Springer Berlin Heidelberg. p. 868. ISBN 978-3-540-00238-3. Retrieved 3 April 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (21873) Jindrichuvhradec". Asteroid Lightcurve Database (LCDB). Retrieved 17 May 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 17 May 2016.
    5. 1 2 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096Freely accessible. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 3 December 2016.
    6. 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 17 May 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 17 May 2016.
    8. 1 2 "21873 Jindrichuvhradec (1999 UU3)". Minor Planet Center. Retrieved 3 April 2016.
    9. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 May 2016.

    External links

    This article is issued from Wikipedia - version of the 12/3/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.