7204 Ondřejov

7204 Ondřejov
Discovery [1]
Discovered by P. Pravec
Discovery site Ondřejov Obs.
Discovery date 3 April 1995
Designations
MPC designation 7204 Ondřejov
Named after
 Ondřejov
(town and observatory)[2]
1995 GH · 1980 WM3
main-belt · (middle) [3]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 35.26 yr (12,877 days)
Aphelion 2.9913 AU
Perihelion 2.3451 AU
2.6682 AU
Eccentricity 0.1211
4.36 yr (1,592 days)
78.331°
0° 13m 33.96s / day
Inclination 4.8613°
172.34°
235.30°
Physical characteristics
Dimensions 5.685±0.163 km[4]
6.25 km (calculated)[3]
5.2334±0.0101 h[5]
0.1810±0.0088[4]
0.10 (assumed)[3]
S [3]
13.8[1]
13.7[4]
13.687±0.005 (R)[5]
13.67±0.19[6]
14.14[3]

    7204 Ondřejov, provisional designation 1995 GH, is a stony asteroid from the middle region of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 3 April 1995, by Czech astronomer Petr Pravec at Ondřejov Observatory near Prague, Czech Republic.[7] This asteroid was the observatory's first numbered minor planet discovery.[2]

    The S-type asteroid orbits the Sun at a distance of 2.3–3.0 AU once every 4 years and 4 months (1,592 days). Its orbit has an eccentricity of 0.12 and an inclination of 5° with respect to the ecliptic.[1] The first precovery was taken at Palomar Observatory in 1980, extending the asteroid's observation arc by 15 years prior to its discovery.[7]

    A rotational light-curve was obtained based on a photometric observations at the U.S. Palomar Transient Factory, California, in December 2011. It showed a rotation period of 5.2334±0.0101 hours with a brightness amplitude of 0.55 in magnitude (U=2).[5]

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 5.9 kilometers in diameter and its surface has an albedo of 0.18,[4] while the Collaborative Asteroid Lightcurve Link assumes a lower albedo of 0.10 and calculates a diameter of 6.3 kilometers.[3]

    The minor planet was named for both, the Czech village of Ondřejov, and its discovering Ondřejov Observatory, founded in 1898. It is the Czech Republic's oldest astronomical observatory still in use. In 1953, the observatory was integrated into the Astronomical Institute and is now also owned by the Academy of Sciences of the Czech Republic. Ondřejov is located about 35 kilometers southeast of the country's capital, Prague.[2] Naming citation was published on 22 February 1997 (M.P.C. 29149).[8]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 7204 Ondrejov (1995 GH)" (2016-03-02 last obs.). Jet Propulsion Laboratory. Retrieved 17 May 2016.
    2. 1 2 3 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (7204) Ondřejov. Springer Berlin Heidelberg. p. 583. ISBN 978-3-540-00238-3. Retrieved 13 April 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (7204) Ondrejov". Asteroid Lightcurve Database (LCDB). Retrieved 13 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 17 May 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 17 May 2016.
    6. ↑ 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.
    7. 1 2 "7204 Ondrejov (1995 GH)". Minor Planet Center. Retrieved 13 April 2016.
    8. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 May 2016.

    External links

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