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( ) 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
is also the name of the volcanic satellite
. With a two-digit number and a two-letter name, 85 Io has the shortest designation of all minor planets.
- <div id="Torppa2003">, Icarus, Vol. 164, p. 346 (2003).</div>
- <div id="IRAS"></div>
- <div id="Erikson99">A. Erikson Photometric observations and modelling of the asteroid 85 Io in......