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.
Discovery | |
---|---|
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) |
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 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° |
31.730° | |
Physical characteristics | |
Dimensions | 15.42 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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