astro.wikisort.org - Asteroid

2153 Akiyama, provisional designation 1978 XD, is a carbonaceous Themistian asteroid from the outer region of the asteroid belt, approximately 17 kilometers in diameter.

2153 Akiyama

Discovery [1]
Discovery site	Harvard College Obs. (George R. Agassiz Station)
Discovery date	1 December 1978
Designations
MPC designation	(2153) Akiyama
Named after	Kaoru Akiyama (Japanese astronomer)[2]
Alternative designations	1978 XD · 1955 UQ1 1972 YA · 1973 AK3 1977 VW · 1979 FS
Minor planet category	main-belt · Themis [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	62.66 yr (22,887 days)
Aphelion	3.5985 AU
Perihelion	2.6491 AU
Semi-major axis	3.1238 AU
Eccentricity	0.1520
Orbital period (sidereal)	5.52 yr (2,017 days)
Mean anomaly	58.291°
Mean motion	0° 10m 42.6s / day
Inclination	1.1842°
Longitude of ascending node	47.746°
Argument of perihelion	31.730°
Physical characteristics
Dimensions	15.42 km (calculated)[3] 16.79±1.4 km (IRAS:2)[1] 21.15±0.36 km[4]
Synodic rotation period	12.5132±0.0053 h[5] 12.5325±0.0053 h[5]
Geometric albedo	0.069±0.017[4] 0.08 (assumed)[3] 0.1089±0.020 (IRAS:2)[1]
Spectral type	C [3]
Absolute magnitude (H)	12.0[1] · 12.02±0.28[6] · 11.90[4] · 11.970±0.002 (R)[5] · 11.920±0.003 (R)[5] · 12.42[3]

The asteroid was discovered by staff members at the George R. Agassiz Station of the Harvard College Observatory on 1 December 1978, and named Japanese astronomer Kaoru Akiyama.[7]

Orbit and classification

Akiyama is a member of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun at a distance of 2.6–3.6 AU once every 5 years and 6 months (2,017 days). Its orbit has an eccentricity of 0.15 and an inclination of 1° with respect to the ecliptic.[1] A first precovery was taken at Palomar Observatory in 1954, extending the asteroid's observation arc by 24 years prior to its discovery.[7]

Physical characteristics

Akiyama has been characterized as a dark C-type asteroid.[3]

Diameter and albedo

According to the space-based surveys carried out by the Infrared Astronomical Satellite IRAS and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Akiyama measures 16.8 and 21.2 kilometers in diameter, respectively, with a corresponding albedo of 0.11 and 0.07.[1][4] The Collaborative Asteroid Lightcurve Link assumes an intermediary albedo of 0.08 and calculates a diameter of 15.4 kilometers with an absolute magnitude of 12.42.[3]

Rotation period

Two rotational lightcurves of Akiyama were obtained from photometric observations made at the U.S. Palomar Transient Factory in October 2010 and January 2012. They showed a rotation period of 12.5325±0.0053 and 12.5132±0.0053 hours with a brightness variation of 0.26 and 0.27 in magnitude, respectively (U=2/2).[5]

Naming

This minor planet was named in memory of Japanese astronomer Kaoru Akiyama (1901–1970), professor at Hosei University, Tokyo, and widely known for his studies on minor planets. In collaboration with astronomer Kiyotsugu Hirayama, after whom the asteroid 1999 Hirayama is named, he made the first detailed orbital analysis of the asteroid 153 Hilda, which has a 2:3 orbital resonance with Jupiter.[2] The official naming citation was published by the Minor Planet Center on 1 November 1979 (M.P.C. 5014).[8]

References

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 2153 Akiyama at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 2153 Akiyama at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (2153) Akiyama

(2153) Akiyama (1978 XD; 1955 UQ1; 1972 YA; 1973 AK3; 1977 VW; 1979 FS) ist ein Asteroid des äußeren Hauptgürtels, der zur Themis-Familie gehört und am 1. Dezember 1978 am Oak-Ridge-Observatorium (damals als Agassiz Station Teil des Harvard-College-Observatorium) entdeckt wurde.

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- [en] 2153 Akiyama

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[es] (2153) Akiyama

(2153) Akiyama es un asteroide que forma parte del cinturón de asteroides y fue descubierto por el equipo del Observatorio del Harvard College desde la Estación George R. Agassiz, Estados Unidos, el 1 de diciembre de 1978.

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