What is 85 Io?
<!-- Additional parameters for this template are available at [[Template:Infobox Planet]]. -->{{Infobox Planet | bgcolour=#FFFFC0 | name=85 Io | discoverer=[[Christian Heinrich Friedrich Peters|C. H. F. Peters]] | discovered=September 19, 1865 | alt_names=A899 LA; A899 UA | mp_category=[[Main belt]] | epoch=March 6, 2006 ([[Julian day|JD]] 2453800.5) | semimajor=396.837 [[Giga|G]][[metre|m]] (2.652 [[Astronomical unit|AU]]) | perihelion=320.334 Gm (2.141 AU) | aphelion=473.341 Gm (3.164 AU) | eccentricity=0.193 | period=1578.081 [[day|d]] (4.32 [[Julian year (astronomy)|a]]) | inclination=11.967[[degree (angle)|°]] | asc_node=203.440° | arg_peri=122.293° | mean_anomaly=206.947° | avg_speed=18.12 km/[[second|s]] | dimensions=180×160×160 km<sup>[http://www.rni.helsinki.fi/~mjk/thirty.pdf][[#Erikson99|[4]]]</sup> | mass=~3.4×10<sup>18</sup> ''(estimate)'' | density=~1.4 g/[[cubic centimetre|cm³]] ''(estimate)''<sup>[[#Krasinsky|[5]]]</sup> | surface_grav=~0.028 m/s² ''(estimate)'' | escape_velocity=~0.07 km/s ''(estimate)'' | rotation=0.2864 d (6.875 [[hour|h]]) <sup>[http://www.psi.edu/pds/archive/lc.html]</sup> | spectral_type=[[C-type asteroid]] | abs_magnitude=7.61 | albedo=0.067 <sup>[http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab]</sup> | single_temperature=~172 [[kelvin|K]]<br />''max:'' 272K (-2° [[celsius|C]])}} '''85 Io''' is a big, dark [[Asteroid belt|Main belt]] [[asteroid]] of the [[C-type asteroid|C]] spectral class. It is probably a primitive body made of [[carbonate]]s. Like [[70 Panopaea]] it orbits within the [[Eunomia family|Eunomia asteroid family]] but it is not related to the shattered parent body. Io is a [[Prograde and retrograde motion|retrograde]] rotator, with its pole pointing towards one of [[ecliptic coordinate system|ecliptic coordinates]] (β, λ) = (-45°, 105°) or (-15°, 295°) with a 10° uncertainty<sup>[[#Torppa2003|[1]]]</sup>. This gives an [[axial tilt]] of about 125° or 115°, respectively. Its shape is quite [[Sphere|spherical]]. It wa