9 Metis A three-dimensional model o 9 Metis based on its licht curve.
Discovery Discovered bi A. Graham Discovery date 25 April 1848 Designations Pronunciation MEE -tissNamed after
Mētis Alternative names
1974 QU2 Minor planet category
Main belt Adjectives Metidian 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 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[ 2] 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] 4.12±1.33 g/cm³[ 3] Surface gravity
~0.070 m/s² Escape velocity
~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] Apparent magnitude
8.1[ 9] to 11.83 6.28[ 1] Angular diameter
0.23" to 0.071"
9 Metis is ane o the lairger main-belt asteroids.
↑ 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 .