9 Metis

9 Metis
Discovery A (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html)
Discoverer Andrew Graham
Discovery date April 25, 1848
Alternate
designations
1974 QU2 B (http://cfa-www.harvard.edu/iau/MPDes.html)
Category Main belt
Orbital elements C (http://asteroid.lowell.edu/)
Epoch July 14, 2004 (JD 2453200.5)
Eccentricity (e) 0.122
Semi-major axis (a) 357.052 Gm (2.387 AU)
Perihelion (q) 313.556 Gm (2.096 AU)
Aphelion (Q) 400.548 Gm (2.678 AU)
Orbital period (P) 1346.815 d (3.69 a)
Mean orbital speed 19.28 km/s
Inclination (i) 5.576°
Longitude of the
ascending node
(Ω)
68.982°
Argument of
perihelion
(ω)
5.489°
Mean anomaly (M) 274.183°
Physical characteristics
Dimensions 235×165 km [1] (http://web.media.mit.edu/~win/hstpub.pdf) km
Mass 4.6×1018 kg
Density 2 ? g/cm³
Surface gravity 0.036 m/s²
Escape velocity 0.081 km/s
Rotation period 0.2116 d 2 (http://www.psi.edu/pds/archive/lc.html)
Spectral class S-type asteroid 3 (http://spiff.rit.edu/richmond/parallax/phot/LCSUMPUB.TXT)
Absolute magnitude 6.28
Albedo 0.160 3 (http://spiff.rit.edu/richmond/parallax/phot/LCSUMPUB.TXT)
Mean surface
temperature
~185 K

9 Metis (mee'-tis) is one of the largest Main belt asteroids. It is composed of silicates and metallic nickel-iron.

Metis was discovered by A. Graham on April 25, 1848; his only asteroid discovery. It is also the only asteroid to have been discovered from Ireland. Its name comes from the mythological Metis, a Titaness, daughter of Tethys and Oceanus (and thus an Oceanid), who was the first wife of Zeus and the mother of Athena. Zeus devoured her lest she bear a child more powerful than he.

Light curve data on Metis led to an assumption that it could have a satellite. However, subsequent observations failed to confirm this. [2] (http://www.bdl.fr/observateur/binast/binary_ast.php) [3] (http://www.johnstonsarchive.net/astro/asteroidmoonsq.html) Metis was later observed with the Hubble Space Telescope in 1993, which was able to resolve the irregular shape of the asteroid, but no satellites were detected. [4] (http://web.media.mit.edu/~win/hstpub.pdf)

Metis has been observed occulting a star no less than 5 times.

Metis is also the name of a satellite of Jupiter.

External links


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The minor planets
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(For other objects and regions, see: Binary asteroids, Asteroid moons and the Solar system)
(For a complete listing, see: List of asteroids. For pronunciation, see: Pronunciation of asteroid names.)
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