Minorplanet: | yes |
Mpc Name: | (185) Eunike |
Discoverer: | C. H. F. Peters, 1878 |
Background: |
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185 Eunike | |
Alt Names: | A878 EA |
Pronounced: | [1] |
Adjective: | Eunikean |
Named After: | Εὐνίκη Eynīkē |
Semimajor: | 2.7383AU |
Perihelion: | 2.3843AU |
Aphelion: | 3.0924abbr=onNaNabbr=on |
Period: | 4.53 yr (1655.1 d) |
Inclination: | 23.238° |
Eccentricity: | 0.12930 |
Dimensions: | 160.61 ± 5.00 km |
Density: | 1.64 ± 1.21 g/cm3 |
Rotation: | 21.797abbr=onNaNabbr=on 21.812 ± 0.001 hours |
Abs Magnitude: | 7.62, 7.45 ± 0.01 |
Discovered: | 1 March 1878 |
Epoch: | 31 July 2016 (JD 2457600.5) |
Asc Node: | 153.84° |
Arg Peri: | 224.01° |
Mean Motion: | / day |
Orbit Ref: | [2] |
Observation Arc: | 131.77 yr (48128 d) |
Uncertainty: | 0 |
Moid: | 1.41759AU |
Jupiter Moid: | 2.40697AU |
Tisserand: | 3.222 |
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 brightnessvariation 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.
As of 17 September 2020, there have been thirteen observed occultations of stars by Eunike.