(85) Io
Asteroid (85) Io |
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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 |
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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
- LD Schmadel : Definitive Orbit of Minor Planet (85) Io from Observations 1865–1977. In: Astronomical News . Volume 300, No. 2, 1979, pp. 111-114, doi: 10.1002 / asna.19793000209