Global Information4951 Iwamoto information
| Discovery [1] | |
|---|---|
| Discovered by | Y. Mizuno T. Furuta |
| Discovery site | Kani Obs. (403) |
| Discovery date | 21 January 1990 |
| Designations | |
MPC designation | (4951) Iwamoto |
Named after | Masayuki Iwamoto (Japanese astronomer)[2] |
Alternative designations | 1990 BM · 1931 UQ 1985 QN6 · 1985 RH5 1989 WS3 |
Minor planet category | main-belt · (inner) [3] |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 85.45 yr (31,210 days) |
| Aphelion | 2.6318 AU |
| Perihelion | 1.8824 AU |
Semi-major axis | 2.2571 AU |
| Eccentricity | 0.1660 |
Orbital period (sidereal) | 3.39 yr (1,239 days) |
Mean anomaly | 79.093° |
Mean motion | 0° 17m 26.52s / day |
| Inclination | 7.5269° |
Longitude of ascending node | 101.08° |
Argument of perihelion | 339.95° |
| Known satellites | 1[4][a] (≥ 0.76 Ds/Dp; P: 118 h) |
| Physical characteristics | |
| Dimensions | 4.39±0.02 km[4] 5.192±0.043 km[5] 5.515±0.033 km[6] 5.528 km (revised WISE)[7] 5.53 km (taken)[3] |
Synodic rotation period | 118 h[8] 118.0±0.2 h[b] |
Geometric albedo | 0.1844 (revised WISE)[7] 0.1859±0.0324[6] 0.218±0.038[5] |
Spectral type | SMASS = S [1] · S [3] V–R = 0.480±0.030[b] |
Absolute magnitude (H) | 13.3[1] · 13.74±0.06[3][7][b] · 13.74[6] · 14.01±1.40[9] |
4951 Iwamoto, provisional designation 1990 BM, is a stony, synchronous binary[a] asteroid and slow rotator from the inner regions of the asteroid belt, approximately 5.5 kilometers in diameter. It was discovered on 21 January 1990, by Japanese astronomers Yoshikane Mizuno and Toshimasa Furuta at Kani Observatory (403) in Japan.[10]
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