9950 ESA
9950 ESA, provisional designation 1990 VB, is an eccentric asteroid and elongated near-Earth object of the Amor group, approximately 1.7 kilometers in diameter. It was discovered on 8 November 1990, by French astronomer Christian Pollas at the Centre de recherches en géodynamique et astrométrie (Cerga) at Caussols in southeastern France. It was named for the European Space Agency (ESA).
Animated orbit of 9950 ESA | |
| Discovery | |
|---|---|
| Discovered by | C. Pollas |
| Discovery site | Caussols Obs. (010) |
| Discovery date | 8 November 1990 |
| Designations | |
MPC designation | (9950) ESA |
Named after | European Space Agency |
Alternative designations | 1990 VB |
Minor planet category | NEO · Amor Mars-crosser |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 26.90 yr (9,824 days) |
| Aphelion | 3.7367 AU |
| Perihelion | 1.1391 AU |
Semi-major axis | 2.4379 AU |
| Eccentricity | 0.5328 |
Orbital period (sidereal) | 3.81 yr (1,390 days) |
Mean anomaly | 17.795° |
Mean motion | 0° 15m 32.04s / day |
| Inclination | 14.597° |
Longitude of ascending node | 253.51° |
| 103.57° | |
| Earth MOID | 0.2806 AU · 109.3 LD |
| Physical characteristics | |
| Dimensions | 1.71 km (calculated) 3 km (estimated): 21 |
Synodic rotation period | 6.707±0.002 h 6.7078±0.0007 h 6.712±0.005 h |
| 0.20 (assumed) | |
| S (assumed) | |
| 16.2 | |
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