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2058 Róka
Discovery
Discovered by	G. Kulin
Discovery site	Konkoly Obs.
Discovery date	22 January 1938
Designations
MPC designation	(2058) Róka
Named after	Gedeon Róka (1906–1974); (Hungarian science writer)
Alternative designations	1938 BH · 1951 NP; 1962 NA · 1963 UM; 1974 SZ1 · 1978 AE; 1985 UL3
Minor planet category	main-belt · Themis
Orbital characteristics
	Epoch 4 September 2017 (JD 2458000.5)
	Uncertainty parameter 0
Observation arc	79.18 yr (28,920 days)
Aphelion	3.5790 AU
Perihelion	2.6682 AU
Semi-major axis	3.1236 AU
Eccentricity	0.1458
Orbital period (sidereal)	5.52 yr (2,016 days)
Mean anomaly	17.333°
Mean motion	0° 10m 42.6s / day
Inclination	2.5352°
Longitude of ascending node	95.329°
Argument of perihelion	180.50°
Physical characteristics
Dimensions	21.12 km (derived); 21.36±3.1 km; 23.40±0.52 km; 24.122±0.246 km; 24.273±0.234 km
Synodic rotation period	10.04±0.02 h; 10.09±0.01 h
Geometric albedo	0.0995 (derived); 0.1196±0.0252; 0.121±0.017; 0.130±0.006; 0.1542±0.056
Spectral type	C · S
Absolute magnitude (H)	11.0 · 11.5 · 11.56±0.34

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.^[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]