9949 Brontosaurus
9949 Brontosaurus, provisional designation 1990 SK6, is a stony asteroid from the inner regions of the asteroid belt, roughly 10 kilometers in diameter. It was discovered on 22 September 1990, by Belgian astronomer Eric Elst at ESO's La Silla Observatory in northern Chile. It was named after Brontosaurus, a genus of dinosaurs.
Orbit of Brontosaurus (blue), with the inner planets and Jupiter (outermost) | |
| Discovery | |
|---|---|
| Discovered by | E. W. Elst |
| Discovery site | La Silla Obs. |
| Discovery date | 22 September 1990 |
| Designations | |
MPC designation | (9949) Brontosaurus |
| Pronunciation | /ˌbrɒntəˈsɔːrəs/ |
Named after | Brontosaurus (sauropod dinosaur) |
Alternative designations | 1990 SK6 · 1978 GT1 1985 DM1 · 1992 BS |
Minor planet category | main-belt · (inner) |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 38.98 yr (14,236 days) |
| Aphelion | 2.4982 AU |
| Perihelion | 2.2105 AU |
Semi-major axis | 2.3544 AU |
| Eccentricity | 0.0611 |
Orbital period (sidereal) | 3.61 yr (1,319 days) |
Mean anomaly | 322.53° |
Mean motion | 0° 16m 22.08s / day |
| Inclination | 7.7036° |
Longitude of ascending node | 29.841° |
| 174.63° | |
| Physical characteristics | |
| Dimensions | 4.231±0.086 km 17 km |
| 0.248±0.010 | |
| 13.8 | |
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