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2613 Plzeň
Discovery
Discovered by	L. Brožek
Discovery site	Kleť Obs.
Discovery date	30 August 1979
Designations
MPC designation	(2613) Plzeň
Named after	Plzeň (Czech city)
Alternative designations	1979 QE · 1969 XA
Minor planet category	main-belt · (outer)
Orbital characteristics
	Epoch 4 September 2017 (JD 2458000.5)
	Uncertainty parameter 0
Observation arc	47.16 yr (17,224 days)
Aphelion	3.1789 AU
Perihelion	2.9028 AU
Semi-major axis	3.0408 AU
Eccentricity	0.0454
Orbital period (sidereal)	5.30 yr (1,937 days)
Mean anomaly	310.56°
Mean motion	0° 11m 9.24s / day
Inclination	13.017°
Longitude of ascending node	277.58°
Argument of perihelion	192.11°
Physical characteristics
Dimensions	22±9 km (generic); 28.007±0.132 km; 28.18 km (IRAS:3)
Geometric albedo	0.0737 (IRAS:3); 0.077±0.010
Absolute magnitude (H)	11.4

2613 Plzeň, provisional designation 1979 QE, is an asteroid from the outer region of the asteroid belt, approximately 28 kilometers in diameter. It was discovered on 30 August 1979, by Czech astronomer Ladislav Brožek at the South Bohemian Kleť Observatory in the Czech Republic.^[5] It was later named for the Czech city of Plzeň.^[2]

Orbit and classification

Plzeň orbits the Sun in the outer main-belt at a distance of 2.9–3.2 AU once every 5 years and 4 months (1,937 days). Its orbit has an eccentricity of 0.05 and an inclination of 13° with respect to the ecliptic.^[1] It was first identified as 1969 XA at Crimea-Nauchnij in 1969. However, Plzeň's observation arc begins with its discovery observation in 1979, as its first identification remained unused.^[5]

Physical characteristics

According to three observations made by the Infrared Astronomical Satellite IRAS and based on observations made by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 28.0 and 28.2 kilometers in diameter and its surface has an albedo of 0.074 and 0.077,^[1]^[4] which is a typical albedo carbonaceous asteroids. Based on its absolute magnitude of 11.4, its mean-diameter is between 13 and 32 kilometers, assuming an albedo in the range of 0.05 to 0.25, which covers both stony and carbonaceous types.^[3]

As of 2016, Plzeň's spectral type, surface composition, rotation period and shape remain unknown.^[1]^[6]

Naming

This minor planet was named in honour of the Czech city of Plzeň, birthplace of the discoverer.^[2] The official naming citation was published on 28 January 1983 (M.P.C. 7619).^[7]