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6267 Rozhen, provisional designation 1987 SO₉, is a stony Flora asteroid from the inner regions of the asteroid belt, approximately 3 kilometers in diameter. It was discovered on 20 September 1987, by Belgian astronomer Eric Elst at Rozhen Observatory near Smoljan, Bulgaria. For four days, between 27 and 31 January 2005, the body was briefly and erroneously renamed 6267 Smolyan.

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 2.0–2.4 AU once every 3 years and 2 months (1,161 days). Its orbit has an eccentricity of 0.09 and an inclination of 2° with respect to the ecliptic. The first precovery was taken at Palomar Observatory in 1949, extending the asteroid's observation arc by 38 years prior to its discovery.

In January 2014, two rotational light-curves for this asteroid were obtained from photometric observations at the U.S. Palomar Transient Factory, California. They rendered a rotation period of 3.9847±0.0007 and 3.980±0.020 hours with a brightness variation of 0.14 and 0.12 in magnitude (U=2/2), respectively. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24, derived from the Flora family's largest member and namesake, the asteroid 8 Flora, and calculates a diameter of 3.0 kilometers, based on an absolute magnitude of 14.77.

The minor planet was named after the discovering Rozhen Observatory, also known as the Bulgarian National Astronomical Observatory, that has been established at Rozhen in 1981. It is located near the city of Smoljan and in proximity to the border with Greece. At 1700 meters above sea leavel, the observatory benefits from superb instrumental and observational conditions. An exhaustive survey for the discovery of minor planets was launched at Rozhen in 1986. Naming citation was published on 20 November 2002 (M.P.C. 47163).

References

1. ^ "JPL Small-Body Database Browser: 6267 Rozhen (1987 SO9)" (2016-11-05 last obs.). Jet Propulsion Laboratory. Retrieved 5 December 2016.
2. ^ Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (6267) Rozhen. Springer Berlin Heidelberg. p. 522. ISBN 978-3-540-00238-3. Retrieved 4 July 2016.
3. ^ "LCDB Data for (6267) Rozhen". Asteroid Lightcurve Database (LCDB). Retrieved 4 July 2016.
4. ^ 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:1506.08493. Bibcode:2015ApJS..219...27C. doi:10.1088/0067-0049/219/2/27. Retrieved 4 July 2016.
5. ^ 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 4 July 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:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 4 July 2016.
7. ^ "6267 Rozhen (1987 SO9)". Minor Planet Center. Retrieved 4 July 2016.
8. "Major News about Minor Planets". hohmanntransfer.com. 28 February 2005. Retrieved 1 January 2016.
9. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 4 July 2016.

External links

• 6267 Rozhen (1987 SO9) was renamed 6267 Smolyan
• Asteroid Lightcurve Database (LCDB), query form (info)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
• 6267 Rozhen at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

• Minor planet object articles (numbered)
• Flora asteroids
• Numbered minor planets
• Discoveries by Eric Walter Elst
• Named minor planets
• Astronomical objects discovered in 1987