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 |
| 1974 QU2 | |
| Main belt | |
| Adjectives | Metidian /mɛˈtɪdiən/ |
| Orbital chairactereestics[1] | |
| 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 |
| 1346.815 d (3.69 a) | |
Average orbital speed | 19.21 km/s |
| 274.183° | |
| Inclination | 5.576° |
| 68.982° | |
| 5.489° | |
| Proper orbital elements[2] | |
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[3] 235×195×140 km[4][5][6] 190 km (Dunham)[1] |
| Mass | (1.47±0.20)×1019 kg[3] |
Mean density | 4.12±1.33 g/cm³[3] |
| ~0.070 m/s² | |
| ~0.11 km/s | |
| 0.2116 d (5.079 h)[1] | |
| Albedo | 0.118 (geometric)[1] |
| Temperatur | ~173 K max: 282 K (+9 °C)[7] |
Spectral teep | S-type[8] |
| 8.1[9] to 11.83 | |
| 6.28[1] | |
| 0.23" to 0.071" | |
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References
eedit- ↑ a b c d e "JPL Small-Body Database Browser: 9 Metis" (last observation: 9 September 2008). Retrieved 10 November 2008.
- ↑ "AstDyS-2 Metis Synthetic Proper Orbital Elements". Department of Mathematics, University of Pisa, Italy. Retrieved 1 October 2011.
- ↑ a b c Jim Baer (2010). "Recent Asteroid Mass Determinations". Personal Website. Archived frae the original on 21 October 2013. Retrieved 13 Februar 2011.
- ↑ Baer, James; Steven R. Chesley (2007). "Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris" (PDF). Celestial Mechanics and Dynamical Astronomy. Springer Science+Business Media B.V. 2007. 100 (2008): 27–42. Bibcode:2008CeMDA.100...27B. doi:10.1007/s10569-007-9103-8. Archived frae the original (PDF) on 24 Februar 2011. Retrieved 10 November 2008. Archived 2011-02-24 at the Wayback Machine
- ↑ J. Torppa et al., Shapes and rotational properties of thirty asteroids from photometric data Archived 2015-11-06 at the Wayback Machine, Icarus Vol. 164, p. 346 (2003).
- ↑ A. D. Storrs et al., A closer look at main-belt asteroids 1: WF/PC images, Icarus Vol. 173, p. 409 (2005).
- ↑ L. F. Lim et al., Thermal infrared (8–13 µm) spectra of 29 asteroids: the Cornell Mid-Infrared Asteroid Spectroscopy (MIDAS) Survey, Icarus Vol. 173, p. 385 (2005).
- ↑ "asteroid lightcurve data file (March 2001)". Archived frae the original on 17 Januar 2010. Retrieved 7 November 2014.
- ↑ Donald H. Menzel and Jay M. Pasachoff (1983). A Field Guide to the Stars and Planets (2nd ed.). Boston, MA: Houghton Mifflin. pp. 391. ISBN 0-395-34835-8.