9 Metis: Asteroid
9 Metis is ane o the lairger main-belt asteroids.
 A three-dimensional model o 9 Metis based on its licht curve. | |
| Discovery | |
|---|---|
| Discovered bi | A. Graham |
| Discovery date | 25 April 1848 |
| Designations | |
| Pronunciation | /ˈmiːtᵻs/ MEE-tiss |
Named after | Mētis |
Alternative names | 1974 QU2 |
Minor planet category | Main belt |
| Adjectives | Metidian /mɛˈtɪdiən/ |
| Orbital chairactereestics | |
| Epoch 14 July 2004 (JD 2453200.5) | |
| Aphelion | 400.548 Gm (2.678 AU) |
| Perihelion | 313.556 Gm (2.096 AU) |
| 357.052 Gm (2.387 AU) | |
| Eccentricity | 0.122 |
Orbital period | 1346.815 d (3.69 a) |
Average orbital speed | 19.21 km/s |
Mean anomaly | 274.183° |
| Inclination | 5.576° |
Longitude o ascendin node | 68.982° |
Argument o perihelion | 5.489° |
| Proper orbital elements | |
Proper semi-major axis | 2.3864354 AU |
Proper eccentricity | 0.1271833 |
Proper inclination | 4.6853629° |
Proper mean motion | 97.638314 deg / yr |
Proper orbital period | 3.68708 yr (1346.705 d) |
Precession o perihelion | 38.754973 arcsec / yr |
Precession of the ascending node | −41.998090 arcsec / yr |
| Pheesical chairacteristics | |
| Dimensions | 222×182×130 km 235×195×140 km 190 km (Dunham) |
| Mass | (1.47±0.20)×1019 kg |
Mean density | 4.12±1.33 g/cm³ |
Surface gravity | ~0.070 m/s² |
Escape velocity | ~0.11 km/s |
| 0.2116 d (5.079 h) | |
| Albedo | 0.118 (geometric) |
| Temperatur | ~173 K max: 282 K (+9 °C) |
Spectral teep | S-type |
Apparent magnitude | 8.1 to 11.83 |
| 6.28 | |
Angular diameter | 0.23" to 0.071" |
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References
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