185 Eunike

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185 Eunike
Discovery
Discovered by C. H. F. Peters, 1878
Designations
Main belt
Orbital characteristics
Aphelion 3.088 AU
Perihelion 2.389 AU
2.738 AU
Eccentricity 0.128
4.53 years
Inclination 23.25°
Physical characteristics
Dimensions 160.61 ± 5.00[1] km
Mass (3.56 ± 2.61) × 1018[1] kg
Mean density
1.64 ± 1.21[1] g/cm3
21.812 ± 0.001[2] hours
Albedo 0.064
Spectral type
C
7.45 ± 0.01[2]

185 Eunike is a dark and very large main-belt asteroid, with an approximate diameter of 157 kilometres. It has a primitive carbonaceous composition.

It was discovered by C. H. F. Peters on March 1, 1878, in Clinton, New York and named after Eunike, a Nereid in Greek mythology whose name means 'happy victory'. The name was chosen to celebrate the Treaty of San Stefano (1878).

Based upon photometric observations made between 2010 and 2014, this asteroid has a rotation period of 21.812 ± 0.001 hours and a brightness variation of 0.08 ± 0.01 in magnitude. At opposition, the absolute magnitude was measured at 7.45 ± 0.01. It displays a hemispheric albedo dichotomy similar to that on 4 Vesta.[2]

There have been three observed occultations of stars by Eunike.

References[edit]

  1. ^ 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.
  2. ^ a b c Pilcher, Frederick et al. (October 2014), "A Comprehensive Photometric Investigation of 185 Eunike", of the Minor Planets Section of the Association of Lunar and Planetary Observers 41 (4): 244–250, Bibcode:2014MPBu...41..244P. 

External links[edit]