85_Io

85 Io

85 Io

Main-belt asteroid

This article is about the asteroid. For the satellite of Jupiter, see Io (moon). For other uses, see Io (disambiguation).

Io (minor planet designation: 85 Io) is carbonaceous asteroid in the central region of the asteroid belt, approximately 170 kilometers in diameter. It is an identified Eunomian interloper.

Quick Facts Discovery, Discovered by ...

Discovery and naming

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

Orbit and physical characteristics

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.[3] This gives an axial tilt of about 125° or 115°, respectively. Its shape is quite regular.[citation needed]

In the SMASS classification, Io is a carbonaceous C-type asteroid, which means that it is probably a primitive body composed of carbonates. Like 141 Lumen it is an interloper that orbits within the Eunomia asteroid family but it is not related to the shattered parent body.[citation needed]

An Ionian diameter of 178 kilometres was measured from an occultation of a star on 10 December 1995.[4] Another asteroid occultation of Io (magnitude 13.2) occurred on 12 March 2009, from the eastern United States, with the star 2UCAC 35694429 (magnitude 13.8).[6]

More information Conjunction to sun, stationary, then retrograde ...

See also

Notes

  1. Assuming a diameter of 165 ± 3 km.

References

  1. [1]
    Noah Webster (1884) A Practical Dictionary of the English Language
  2. [2]
    "JPL Small-Body Database Browser: 85 Io". Jet Propulsion Laboratory. Retrieved 1 November 2017.
  3. [3]
    Torppa, J.; et al. (2003). "Shapes and rotational properties of thirty asteroids from photometric data" (PDF). Icarus. 164 (2): 346. Bibcode:2003Icar..164..346T. doi:10.1016/s0019-1035(03)00146-5.
  4. [4]
    Erikson, A.; Berthier, J.; Denchev, P.V. (1999). "Photometric observations and modelling of the asteroid 85 Io in conjunction with data from an occultation event during the 1995-96 apparition". Planetary and Space Science. 47 (3–4): 327–330. Bibcode:1999P&SS...47..327E. doi:10.1016/S0032-0633(98)00128-7.
  5. [5]
    Fienga, A.; Avdellidou, C.; Hanuš, J. (February 2020). "Asteroid masses obtained with INPOP planetary ephemerides". Monthly Notices of the Royal Astronomical Society. 492 (1). doi:10.1093/mnras/stz3407.
  6. [6]
    http://www.asteroidoccultation.com/2009_03/0312_85_20455.htm [dead link]
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