85 Io
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A three-dimensional model of 85 Io
based on its light curve |
|
Discovery | |
---|---|
Discovered by | C. H. F. Peters |
Discovery date | September 19, 1865 |
Designations | |
Named after
|
Io |
A899 LA; A899 UA | |
Main belt | |
Orbital characteristics | |
Epoch March 6, 2006 (JD 2453800.5) | |
Aphelion | 473.341 Gm (3.164 AU) |
Perihelion | 320.334 Gm (2.141 AU) |
396.837 Gm (2.652 AU) | |
Eccentricity | 0.193 |
1578.081 d (4.32 yr) | |
Average orbital speed
|
18.12 km/s |
206.947° | |
Inclination | 11.967° |
203.440° | |
122.293° | |
Physical characteristics | |
Dimensions | 180×160×160 km[1][2] |
Mass | ~ 3.4×1018 (estimate) |
Mean density
|
~ 1.4 g/cm³ (estimate)[3] |
~ 0.028 m/s² (estimate) | |
~ 0.07 km/s (estimate) | |
0.2864 d (6.875 h)[4] | |
Albedo | 0 .067 [4] |
Temperature | ~ 172 K max: 272K (-2° C) |
Spectral type
|
FC/B[4] |
7.61 [4] | |
85 Io (/ˈaɪ.oʊ/ 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.[1] 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.[2] 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).[5]
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.
Conjunction to sun | stationary, then retrograde | Opposition | Minimal distance (AE) | Maximum brightness (mag) | stationary, then prograde |
---|---|---|---|---|---|
27. April 2004 | 31.October 2004 | 23. December 2004 | 1,92017 AE | 12,3 mag | 11. February 2005 |
3.August 2005 | 9. January 2006 | 5. March 2006 | 2,14389 AE | 11,8 mag | 25. April 2006 |
17.October 2006 | 26. April 2007 | 9.June 2007 | 1,38393 AE | 12,1 mag | 26.July 2007 |
7. March 2008 | 6.October 2008 | 22.November 2008 | 1,61470 AE | 10,7 mag | 9. January 2009 |
8. July 2009 | 17. December 2009 | 12. February 2010 | 2,19864 AE | 11,1 mag | 3. April 2010 |
21. September 2010 | 15. March 2011 | 30. April 2011 | 1,68623 AE | 12,2 mag | 20.June 2011 |
7. January 2012 | 31.August 2012 | 12.October 2012 | 1,28465 AE | 11,1 mag | 19.November 2012 |
9.June 2013 | 25.November 2013 | 20. January 2014 | 2,13519 AE | 10,1 mag | 12. March 2014 |
29.August 2014 | 10. February 2015 | 1. April 2015 | 1,95222 AE | 12,2 mag | 22.May 2015 |
22.November 2015 | 30.June 2016 | 14.August 2016 | 1,16222 AE | 11,6 mag | 17.September 2016 |
3.May 2017 | 3.November 2017 | 26. December 2017 | 1,95048 AE | 10,2 mag | 15. February 2018 |
6.August 2018 | 13. January 2019 | 9. March 2019 | 2,12957 AE | 11,8 mag | 28. April 2019 |
21.October 2019 | 2.May 2020 | 14.June 2020 | 1,34977 AE | 12,0 mag | 30.July 2020 |
See also
References
- ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 4.2 4.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ http://www.asteroidoccultation.com/2009_03/0312_85_20455.htm[dead link]
External links
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