173 Ino

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173 Ino
Discovered by A. Borrelly
Discovery date August 1, 1877
Minor planet category Main belt
Orbital characteristics[1]
Aphelion 3.314 AU
Perihelion 2.171 AU
Semi-major axis 2.742 AU
Eccentricity 0.208
Orbital period 4.54 years
Inclination 14.21°
Physical characteristics
Dimensions 160.07 ± 6.04[2] km
Mass (4.79 ± 3.11) × 1018[2] kg
Mean density 2.23 ± 1.47[2] g/cm3
Rotation period 6.163[3] hours
Albedo 0.064
Spectral type C
Absolute magnitude (H) 7.80[4]

173 Ino is a large main-belt asteroid that was discovered by French astronomer Alphonse Borrelly on August 1, 1877, and named after Ino, a queen in Greek mythology. The adjectival form of the asteroid name is Inoan. Categorized as a C-type asteroid from its spectrum, 173 Ino has a dark surface and a primitive carbonaceous composition.

Multiple photometric studies of this asteroid were performed between 1978 and 2002. The combined data gave an irregular, asymmetrical light curve with a period of 6.163 ± 0.005 hours and a brightness variation of 0.10–0.15 in magnitude. The asteroid is rotating in a retrograde direction.[3]


  1. ^ Yeomans, Donald K., "173 Ino", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-25. 
  2. ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98-118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009.  See Table 1.
  3. ^ a b Michałowski, T. et al. (April 2005), "Photometry and models of selected main belt asteroids. II. 173 Ino, 376 Geometria, and 451 Patientia", Astronomy and Astrophysics 443 (1): 329–335, Bibcode:2005A&A...443..329M, doi:10.1051/0004-6361:20053656. 
  4. ^ Warner, Brian D. (December 2007), "Initial Results of a Dedicated H-G Project", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 34: 113–119, Bibcode:2007MPBu...34..113W.