21873 Jindřichůvhradec

21873 Jindřichůvhradec
Discovery [1]
Discovered by J. Tichá
M. Tichý
Discovery site Kleť Observatory
Discovery date 29 October 1999
Designations
MPC designation 21873 Jindřichůvhradec
Named after
 Jindřichův Hradec
(town, Czech Republic)[2]
1999 UU3 · 1982 SN8
1988 XA5
main-belt · (outer) [3]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 33.21 yr (12,131 days)
Aphelion 3.8064 AU
Perihelion 2.5003 AU
3.1534 AU
Eccentricity 0.2070
5.60 yr (2,045 days)
343.65°
0° 10m 33.6s / day
Inclination 4.4622°
238.02°
131.02°
Physical characteristics
Dimensions 7.183±0.136 km[4]
10.44 km (calculated)[3]
50.5874±0.0664 h[5]
0.2368±0.0879[4]
0.057 (assumed)[3]
C [3] · X [6]
13.1[1]
13.63[3]
12.9[4]
12.90±0.17[6]
13.184±0.005 (R)[5]

    21873 Jindřichůvhradec, provisional designation 1999 UU3, is a relatively slow rotating asteroid from the outer region of the asteroid belt, approximately 7 to 10 kilometers in diameter. It was discovered by Czech astronomers Jana Tichá and Miloš Tichý at the South Bohemian Kleť Observatory on 29 October 1999.[7]

    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 plane of the ecliptic.[1]

    In 2010, a photometric light-curve analysis at the U.S. Palomar Transient Factory (PTF), California, gave a rotation period of 50.5874±0.0664 hours with a brightness amplitude of 0.61 in magnitude (U=2).[5] 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.

    According to the surveys carried out by the NEOWISE mission of NASA's 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 (CALL) assumes a much lower albedo of 0.057, typical for carbonaceous asteroids, 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] Another observation at the PTF classifies the body as a X-type asteroid, which metallic core group has an intermediate albedo between stony and carbonaceous bodies.[6]

    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]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 21873 Jindrichuvhradec (1999 UU3)" (2015-12-06 last obs.). Jet Propulsion Laboratory. Retrieved April 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 April 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (21873) Jindrichuvhradec". Asteroid Lightcurve Database (LCDB). Retrieved 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:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 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:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved April 2016.
    6. 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:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved April 2016.
    7. ↑ "21873 Jindrichuvhradec (1999 UU3)". Minor Planet Center. Retrieved April 2016.

    External links

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