Epoch July 14, 2004 (JD 2453200.5)
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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 | |
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Dimensions | 235165 km1 |
Mass | 4.61018 kg (estimation) |
Density | 2 g/cm³ (estimation) |
Surface gravity | 0.036 m/s² (estimation) |
Escape velocity | 0.081 km/s (estimation) |
Rotation period | 0.2116 d 2 |
Spectral class | S-type 3 |
Absolute magnitude | 6.28 |
Albedo | 0.160 3 |
Mean surface temperature |
~177 K |
9 Metis (mee'-tis) is one of the largest Main belt asteroids. It is composed of silicates and metallic nickel-iron.
Size comparison: the first 10 asteroids profiled against Earth's Moon. From left to right, 1 Ceres, 2 Pallas, 3 Juno, 4 Vesta, 5 Astraea, 6 Hebe, 7 Iris, 8 Flora, 9 Metis, and 10 Hygiea. [Source]
Metis was discovered by Andrew Graham on April 25, 1848; his only asteroid discovery. It is also the only asteroid to have been discovered as a result of observations 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. [1] [2] 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. [3]
Metis has been observed occulting a star no less than 5 times.
Metis is also the name of a satellite of Jupiter.
Aspects
Stationary, retrograd | Opposition | distance to earth (AU) | maximum brightness | Stationary, prograde | conjunction to sun |
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January 19, 2006 | March 3, 2006 | 1.35200 | 9.1 mag | April 20, 2006 | June 7, 2005 |
May 4, 2007 | June 23, 2007 | 1.64582 | 9.7 mag | August 13, 2007 | November 5, 2006 |
September 24, 2008 | November 5, 2008 | 1.13923 | 8.4 mag | December 19, 2008 | February 15, 2008 |
February 23, 2010 | April 11, 2010 | 1.53609 | 9.5 mag | June 3, 2010 | August 7, 2009 |
June 11, 2011 | July 28, 2011 | 1.53974 | 9.6 mag | September 16, 2011 | December 6, 2010 |
November 23, 2012 | January 2, 2013 | 1.13905 | 8.5 mag | February 12, 2013 | March 30, 2012 |
March 26, 2014 | May 15, 2014 | 1.64402 | 9.6 mag | July 7, 2014 | September 23, 2013 |
July 25, 2015 | September 6, 2015 | 1.35478 | 9.2 mag | October 25, 2015 | January 5, 2015 |
January 11, 2017 | February 22, 2017 | 1.31456 | 9.0 mag | April 10, 2017 | May 27, 2016 |
April 28, 2018 | June 17, 2018 | 1.65468 | 9.7 mag | August 7, 2018 | October 30, 2017 |
September 14, 2019 | October 27, 2019 | 1.16286 | 8.6 mag | December 10, 2019 | February 8, 2019 |
Links
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The minor planets
Vulcanoids | Main belt | Groups and families | Near-Earth objects | Jupiter Trojans
Centaurs | Damocloids | Comets | Trans-Neptunians (Kuiper belt | Scattered disc | Oort cloud)
For other objects and regions, see: Binary asteroids, Asteroid moons and the Solar system
Retrieved from "http://en.wikipedia.org"
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