Trisha Shetty (Editor)

85 Io

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Discovered by  C. H. F. Peters
Alternative names  A899 LA; A899 UA
Aphelion  473.341 Gm (3.164 AU)
Discovered  19 September 1865
Spectral type  C-type asteroid
Asteroid family  Eunomia family
Discovery date  September 19, 1865
Minor planet category  Main belt
Perihelion  320.334 Gm (2.141 AU)
Orbits  Sun
Named after  Io
85 Io httpsuploadwikimediaorgwikipediacommonsthu
Discoverer  Christian Heinrich Friedrich Peters
Similar  Christian Heinrich Friedrich Peters discoveries, Other celestial objects

85 Io (/ˈ./ EYE-oh) 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. 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. 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.


85 Io Wikipedia

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