Global Information9903 Leonhardt information
 Orbit of Leonhardt (blue), with the inner planets and Jupiter (outermost) | |
| Discovery [1] | |
|---|---|
| Discovered by | P. G. Comba |
| Discovery site | Prescott Obs. |
| Discovery date | 4 July 1997 |
| Designations | |
MPC designation | (9903) Leonhardt |
Named after | Gustav Leonhardt (conductor and harpsichordist)[2] |
Alternative designations | 1997 NA1 · 1976 UG6 |
Minor planet category | main-belt [1][3] · (outer) |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 40.43 yr (14,767 days) |
| Aphelion | 3.8232 AU |
| Perihelion | 2.3527 AU |
Semi-major axis | 3.0880 AU |
| Eccentricity | 0.2381 |
Orbital period (sidereal) | 5.43 yr (1,982 days) |
Mean anomaly | 240.21° |
Mean motion | 0° 10m 53.76s / day |
| Inclination | 1.6903° |
Longitude of ascending node | 195.95° |
Argument of perihelion | 139.13° |
| Physical characteristics | |
| Dimensions | 8.499±0.240 km[4] 17.8 km[5] |
Geometric albedo | 0.042±0.008[4] |
Absolute magnitude (H) | 14.5[1] |
9903 Leonhardt, provisional designation 1997 NA1, is a dark asteroid from the outer region of the asteroid belt, approximately 10 kilometers in diameter.
The asteroid was discovered on 4 July 1997, by American amateur astronomer Paul Comba at Prescott Observatory in Arizona, United States.[3] It was named after Dutch keyboard player Gustav Leonhardt.[2]
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