(85) Io

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Asteroid
(85) Io
Properties of the orbit ( animation )
Orbit type Main belt asteroid
Asteroid family Eunomia family
Major semi-axis 2,655  AU
eccentricity 0.192
Perihelion - aphelion 2.147 AU - 3.163 AU
Inclination of the orbit plane 12 °
Length of the ascending node 203.4 °
Argument of the periapsis 122.3 °
Time of passage of the perihelion December 27, 2020
Sidereal period 4 a 119 d
Mean orbital velocity 18.1 km / s
Physical Properties
Medium diameter 155 km
Albedo 0.067
Rotation period 6 h 53 min
Absolute brightness 7.61 likes
history
Explorer CHF Peters
Date of discovery September 19, 1865
Another name A899 LA, A899 UA
Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items.

(85) Io is an asteroid of the main asteroid belt discovered on September 19, 1865 by Christian Heinrich Friedrich Peters . The celestial body was named after Io , a lover of Zeus .

Io moves around the Sun at a distance of 2.1359 ( perihelion ) to 3.1677 ( aphelion ) astronomical units in 4.32 years . The orbit is inclined 11.9206 ° to the ecliptic , the orbital eccentricity is 0.1945.

Io has a mean diameter of 155 kilometers and a dark carbonaceous surface with an albedo of 0.067. Io rotates around its own axis in around 6 hours and 53 minutes.

Constellations

Conjunction with the sun Stationary, then retrograde opposition Minimum distance (AE) Maximum brightness (mag) Stationary, then clockwise
July 8, 2009 December 17, 2009 February 12, 2010 2.19864 11.1 April 3, 2010
September 21, 2010 March 15, 2011 April 30, 2011 1.68623 12.2 June 20, 2011
January 7, 2012 August 31, 2012 October 12, 2012 1.28465 11.1 19th November 2012
June 9, 2013 November 25, 2013 20th January 2014 2.13519 10.1 March 12, 2014
29th August 2014 February 10, 2015 April 1, 2015 1.95222 12.2 May 22, 2015
November 22, 2015 June 30, 2016 August 14, 2016 1.16222 11.6 17th September 2016
May 3, 2017 3rd November 2017 December 26, 2017 1.95048 AU 10.2 mag 15th February 2018
August 6, 2018 January 13, 2019 March 9, 2019 2.12957 AU 11.8 mag April 28, 2019
October 21, 2019 May 2, 2020 June 14, 2020 1,34977 AU 12.0 mag July 30, 2020

literature