Global Information4217 Engelhardt information
| Discovery [1] | |
|---|---|
| Discovered by | C. Shoemaker |
| Discovery site | Palomar Obs. |
| Discovery date | 24 January 1988 |
| Designations | |
MPC designation | (4217) Engelhardt |
Named after | Wolf von Engelhardt (German mineralogist)[2] |
Alternative designations | 1988 BO2 · 1944 RL 1951 RY1 · 1970 AA |
Minor planet category | main-belt · Phocaea [3][4] |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 72.73 yr (26,563 days) |
| Aphelion | 2.8045 AU |
| Perihelion | 1.8246 AU |
Semi-major axis | 2.3145 AU |
| Eccentricity | 0.2117 |
Orbital period (sidereal) | 3.52 yr (1,286 days) |
Mean anomaly | 272.23° |
Mean motion | 0° 16m 47.64s / day |
| Inclination | 23.129° |
Longitude of ascending node | 355.44° |
Argument of perihelion | 348.79° |
| Known satellites | 1 (P: 36.03 h)[5][a] |
| Physical characteristics | |
| Dimensions | 7.34±1.36 km[6] 8.742±0.356 km[7][8] 9.16±1.0 km[9] 9.24 km (derived)[3] |
Synodic rotation period | 3.066±0.001 h[10] 3.0661±0.0002 h[5][a] |
Geometric albedo | 0.2108±0.052[9] 0.231±0.046[7][8] 0.2489 (derived)[3] 0.37±0.17[6] |
Spectral type | S [3][11] |
Absolute magnitude (H) | 12.10±0.67[11] · 12.20[6] · 12.3[1][3] · 12.50[7][9] |
4217 Engelhardt, provisional designation 1988 BO2, is a stony Phocean asteroid and a potentially binary system from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 24 January 1988, by American astronomer Carolyn Shoemaker at Palomar Observatory in California, and later named after German mineralogist Wolf von Engelhardt.[12]
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