Mass
In 2007, Baer and Chesley estimated Metis to have a mass of 1.6-to-2.5×1019 kg. This would give this stony asteroid a density of about 6 (3.3 to 8.9) g/cm³. A more recent estimate by Baer suggests it has a mass of (1.47±0.20)×1019 kg. Metis appears to be more dense than most other asteroids with a diameter close to 200km. This may support the theory that Metis is the core remnant of a large evolved asteroid for which 90% of the original mass has been lost.
Metis passed within 0.034AU (5 million kilometres) of Vesta on 19 August 2004.
Read more about this topic: 9 Metis
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