85 Io

85 Io

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85 Io

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Description:
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85 Io ( ) is a large, dark main-belt asteroid of the C spectral class. It is probably a primitive body composed of carbonates. Like 70 Panopaea it orbits within the Eunomia asteroid family but it is not related to the shattered parent body.

Io is a retrograde rotator, with its pole pointing towards one of ecliptic coordinates (β, λ) = (-45°, 105°) or (-15°, 295°) with a 10° uncertainty.<sup></sup> This gives an axial tilt of about 125° or 115°, respectively. Its shape is quite regular.

It was discovered by C. H. F. Peters on September 19, 1865, and named after Io, a lover of Zeus in Greek mythology.

An Ionian diameter of 178 kilometres was measured from an occultation of a star on December 10, 1995.<sup></sup> Another asteroid occultation of Io (magnitude 13.2) occurred on March 12, 2009, from the eastern USA, with the star 2UCAC 35694429(magnitude 13.8).

Io is also the name of the volcanic satellite of Jupiter. With a two-digit number and a two-letter name, 85 Io has the shortest designation of all minor planets.



References

  1. <div id="Torppa2003">, Icarus, Vol. 164, p.&nbsp;346 (2003).</div>
  2. <div id="IRAS"></div>
  3. <div id="Erikson99">A. Erikson Photometric observations and modelling of the asteroid 85 Io in...... ...
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