2058 Róka

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

2058 Róka
Discovery [1]
Discovered byG. Kulin
Discovery siteKonkoly Obs.
Discovery date22 January 1938
Designations
(2058) Róka
Named after
Gedeon Róka (1906–1974)
(Hungarian science writer)[2]
1938 BH · 1951 NP
1962 NA · 1963 UM
1974 SZ1 · 1978 AE
1985 UL3
main-belt · Themis [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc79.18 yr (28,920 days)
Aphelion3.5790 AU
Perihelion2.6682 AU
3.1236 AU
Eccentricity0.1458
5.52 yr (2,016 days)
17.333°
0° 10m 42.6s / day
Inclination2.5352°
95.329°
180.50°
Physical characteristics
Dimensions21.12 km (derived)[3]
21.36±3.1 km[4]
23.40±0.52 km[5]
24.122±0.246 km[6]
24.273±0.234 km[7]
10.04±0.02 h[8]
10.09±0.01 h[9]
0.0995 (derived)[3]
0.1196±0.0252[7]
0.121±0.017[6]
0.130±0.006[5]
0.1542±0.056[4]
C [10] · S [3]
11.0[4][5][7] · 11.5[1][3] · 11.56±0.34[10]

    It was discovered on 22 January 1938, by Hungarian György Kulin at Konkoly Observatory in Budapest, Hungary.[11] The asteroid was named in memory of Hungarian science writer Gedeon Róka.[2]

    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.[1] The body's observation arc begins with its official discovery observation at Konkoly in 1938.[11]

    Physical characteristics

    Róka has been characterized as a carbonaceous C-type asteroid by Pan-STARRS photometric survey.[10] Due to its ambivalent albedo it is also an assumed S-type asteroid.[3]

    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-).[8] 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).[9]

    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.[4][5][6][7] 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.[3]

    Naming

    This minor planet was named in memory of Gedeon Róka (1906–1974), a Hungarian science writer and popularizer of astronomy from Budapest.[2] The approved naming citation was published by the Minor Planet Center on 1 February 1980 (M.P.C. 5183).[12]

    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.{{cite journal}}: CS1 maint: multiple names: authors list (link)
    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.

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