1309 Hyperborea
1309 Hyperborea/haɪpərˈbɔːriːə/ is a carbonaceous background asteroid from the outermost regions of the asteroid belt, approximately 57 kilometers in diameter. It was discovered on 11 October 1931, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula, and given the provisional designation 1931 TO. The asteroid was named after Hyperborea, the northern homeland of a Greek mythical race of giants.
| Discovery | |
|---|---|
| Discovered by | G. Neujmin |
| Discovery site | Simeiz Obs. |
| Discovery date | 11 October 1931 |
| Designations | |
MPC designation | (1309) Hyperborea |
| Pronunciation | /haɪpərˈbɔːriːə/ |
Named after | Hyperborea (Greek mythology) |
Alternative designations | 1931 TO · 1934 GT 1971 SG1 · 1973 AW4 A919 RB · A919 SH |
Minor planet category | main-belt · (outer) background |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 98.23 yr (35,880 days) |
| Aphelion | 3.6888 AU |
| Perihelion | 2.7251 AU |
Semi-major axis | 3.2069 AU |
| Eccentricity | 0.1503 |
Orbital period (sidereal) | 5.74 yr (2,098 days) |
Mean anomaly | 292.38° |
Mean motion | 0° 10m 17.76s / day |
| Inclination | 10.279° |
Longitude of ascending node | 206.08° |
| 244.90° | |
| Physical characteristics | |
| Dimensions | 55.14±14.34 km 55.48±13.26 km 57.11 km (derived) 57.15±3.9 km 57.570±0.349 km 57.99±0.72 km 61.605±1.019 km 64.40±2.03 km |
Synodic rotation period | 13.858±0.004 h 13.87±0.002 13.88±0.02 h 13.95±0.02 h |
| 0.03±0.02 0.032±0.007 0.0387±0.0054 0.04±0.03 0.0411 (derived) 0.043±0.005 0.044±0.001 0.0450±0.007 | |
| C | |
| 10.20 · 10.30 · 10.30±0.11 · 10.40 · 10.43 | |
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