5333 Kanaya

5333 Kanaya, provisional designation 1990 UH, is a carbonaceous asteroid from the inner regions of the asteroid belt, approximately 14 kilometers in diameter.

5333 Kanaya

Discovery[1]
Discovered by	M. Akiyama T. Furuta
Discovery site	Mishima Obs. (886)
Discovery date	18 October 1990
Designations
MPC designation	(5333) Kanaya
Named after	Kanaya, Shizuoka (Japanese city)[2]
Alternative designations	1990 UH · 1974 HC2 1979 SJ2 · 1981 EJ49 1985 JE2
Minor planet category	main-belt · (inner)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	62.62 yr (22,871 days)
Aphelion	2.7398 AU
Perihelion	1.9515 AU
Semi-major axis	2.3456 AU
Eccentricity	0.1680
Orbital period (sidereal)	3.59 yr (1,312 days)
Mean anomaly	61.888°
Mean motion	0° 16m 27.84s / day
Inclination	10.973°
Longitude of ascending node	208.40°
Argument of perihelion	309.01°
Physical characteristics
Dimensions	13.35 km (calculated)[3] 13.587±0.041 km[4] 13.918±0.032[5] 14.21±0.41 km[6]
Synodic rotation period	3.683±0.001 h[7] 3.8022±0.0008 h[8] 3.80224±0.00006 h[a] 3.8024±0.0002 h[9]
Geometric albedo	0.029±0.004[5] 0.0407±0.0012[4] 0.051±0.003[6] 0.057 (assumed)[3]
Spectral type	SMASS = Ch[1] · C[3][10]
Absolute magnitude (H)	13.1[1][3][4][6] · 12.99±0.33[10]

The asteroid was discovered on 18 October 1990, by Japanese astronomers Makio Akiyama and Toshimasa Furuta at Mishima Observatory (886) in Susono, Japan, and named for the Japanese city of Kanaya.^[2][11]

Orbit and classification

Kanaya orbits the Sun in the inner main-belt at a distance of 2.0–2.7 AU once every 3 years and 7 months (1,312 days). Its orbit has an eccentricity of 0.17 and an inclination of 11° with respect to the ecliptic.^[1]

A first precovery was taken at the Goethe Link Observatory in 1954. It observation arc begins at the Chilean Cerro El Roble Station in 1974, when it was identified as 1974 HC₂, 16 years prior to its official discovery observation at Susono.^[11]

Physical characteristics

In the SMASS classification, Kanaya is a Ch-type asteroid, a hydrated sub-type of the carbonaceous C-type asteroids.^[1]

Diameter and albedo

According to the space-based surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Kanaya measures 14.2 and 13.6 kilometers in diameter, and its surface has an albedo of 0.029 and 0.051, respectively.^[6][4]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 13.4 kilometers with an absolute magnitude of 13.1.^[3]

Lightcurves

Several rotational lightcurves of Kanaya have been obtained from photometric observations. In December 2005, a first lightcurve by astronomer David Higgins at Hunters Hill Observatory (E14), Australia, gave a rotation period of 3.8022 hours with a brightness variation of 0.22 magnitude (U=3).^[8]

In October 2010, Czech astronomer Petr Pravec obtained another well-defined period of 3.80224 hours with an amplitude of 0.16 magnitude (U=3).^[a] Other observations rendered similar periods (U=2+/3-).^[7][9]

Naming

This minor planet was named for the Japanese town of Kanaya (金谷町 Kanaya-chō) in Haibara District of the Shizuoka Prefecture. It is the native town of the first discoverer, Makio Akiyama, and also a station on the ancient "Tokai-do" road. The Malinohara plateau south of Kanaya is well known for its production of green tea.^[2] The official naming citation was published by the Minor Planet Center on 6 February 1993 (M.P.C. 21610).^[12]

Notes

1. Pravec (2010): lightcurve plot of (5333) Kanaya with a rotation period 3.80223±0.00006 hours with a brightness amplitude of 0.16 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL)