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2058 Róka, provisional designation 1938 BH, is a Themistian asteroid from the outer regions of the asteroid belt, approximately 22 kilometers in diameter.

It was discovered on 22 January 1938, by Hungarian György Kulin at Konkoly Observatory in Budapest, Hungary. The asteroid was named in memory of Hungarian science writer Gedeon Róka.

Classification and orbit

Róka is a member of the Themis family, a dynamical family of carbonaceous outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun at a distance of 2.7–3.6 AU once every 5 years and 6 months (2,016 days). Its orbit has an eccentricity of 0.15 and an inclination of 3° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Konkoly in 1938.

Physical characteristics

Róka has been characterized as a carbonaceous C-type asteroid by Pan-STARRS photometric survey. Due to its ambivalent albedo it is also an assumed S-type asteroid.

Lightcurves

In March 2005, a rotational lightcurve of Róka was obtained from photometric observations by French amateur astronomer René Roy. Lightcurve analysis gave a rotation period of 10.04 hours with a brightness variation of 0.34 magnitude (U=3-). One month later, astronomer at the Rose-Hulman Observatory obtained another lightcurve with a concurring period of 10.09 hours and an amplitude of 0.40 magnitude (U=2).

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Róka measures between 21.36 and 24.273 kilometers in diameter and its surface has an albedo between 0.1196 and 0.1542. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0995 and calculates a diameter of 21.12 kilometers based on an absolute magnitude of 11.5.

Naming

This minor planet was named in memory of Gedeon Róka (1906–1974), a Hungarian science writer and popularizer of astronomy from Budapest. The approved naming citation was published by the Minor Planet Center on 1 February 1980 (M.P.C. 5183).

References

1. ^ "JPL Small-Body Database Browser: 2058 Roka (1938 BH)" (2017-03-28 last obs.). Jet Propulsion Laboratory. Retrieved 29 June 2017.
2. ^ Schmadel, Lutz D. (2007). "(2058) Róka". Dictionary of Minor Planet Names – (2058) Róka. Springer Berlin Heidelberg. pp. 166–167. doi:10.1007/978-3-540-29925-7_2059. ISBN 978-3-540-00238-3.
3. ^ "LCDB Data for (2058) Róka". Asteroid Lightcurve Database (LCDB). Retrieved 29 June 2017.
4. ^ Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
5. ^ Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
6. ^ 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:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 29 June 2017.
7. ^ 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.
8. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (2058) Róka". Geneva Observatory. Retrieved 29 June 2017.
9. ^ Addleman, Don; Covele, Brent; Duncan, Allison; Johnson, Jama; Kramb, Steve; Lecrone, Crystal; et al. (December 2005). "Rose-Hulman spring 2005 lightcurve results: 155 Scylla, 590 Tomyris, 1655 Comas Solá, 2058 Roka, 6379 Vrba, and (25934) 2001 DC74". The Minor Planet Bulletin. 32 (4): 76–78. Bibcode:2005MPBu...32...76A. ISSN 1052-8091. Retrieved 29 June 2017.
10. ^ 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 29 June 2017.
11. ^ "2058 Roka (1938 BH)". Minor Planet Center. Retrieved 29 June 2017.
12. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 29 June 2017.

• Minor planet object articles (numbered)
• Themis asteroids
• Discoveries by György Kulin
• Named minor planets
• Astronomical objects discovered in 1938