2153 Akiyama

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
Discovery siteHarvard College Obs.
(George R. Agassiz Station)
Discovery date1 December 1978
Designations
MPC designation
(2153) Akiyama
Named after
Kaoru Akiyama
(Japanese astronomer)
Alternative designations
1978 XD · 1955 UQ1
1972 YA · 1973 AK3
1977 VW · 1979 FS
Minor planet category
main-belt · Themis
Orbital characteristics
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc62.66 yr (22,887 days)
Aphelion3.5985 AU
Perihelion2.6491 AU
Semi-major axis
3.1238 AU
Eccentricity0.1520
Orbital period (sidereal)
5.52 yr (2,017 days)
Mean anomaly
58.291°
Mean motion
0° 10m 42.6s / day
Inclination1.1842°
Longitude of ascending node
47.746°
31.730°
Physical characteristics
Dimensions15.42 km (calculated)
16.79±1.4 km (IRAS:2)
21.15±0.36 km
Synodic rotation period
12.5132±0.0053 h
12.5325±0.0053 h
0.069±0.017
0.08 (assumed)
0.1089±0.020 (IRAS:2)
C
12.0 · 12.02±0.28 · 11.90 · 11.970±0.002 (R) · 11.920±0.003 (R) · 12.42

    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.

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