185 Eunike
| Discovery | |
|---|---|
| Discovered by | C. H. F. Peters, 1878 |
| Discovery date | 1 March 1878 |
| Designations | |
| Main belt | |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 131.77 yr (48128 d) |
| Aphelion | 3.0924 AU (462.62 Gm) |
| Perihelion | 2.3843 AU (356.69 Gm) |
| 2.7383 AU (409.64 Gm) | |
| Eccentricity | 0.12930 |
| 4.53 yr (1655.1 d) | |
| 327.48° | |
| 0° 13m 3.036s / day | |
| Inclination | 23.238° |
| 153.84° | |
| 224.01° | |
| Earth MOID | 1.41759 AU (212.068 Gm) |
| Jupiter MOID | 2.40697 AU (360.078 Gm) |
| Jupiter Tisserand parameter | 3.222 |
| Physical characteristics | |
| Dimensions |
157.51±2.6 km 160.61 ± 5.00 km |
| Mass | (3.56 ± 2.61) × 1018 kg |
|
Mean density
|
1.64 ± 1.21 g/cm3 |
| 21.797 h (0.9082 d) 21.812 ± 0.001 hours |
|
| 0.0638±0.002 | |
| C | |
| 7.62, 7.45 ± 0.01 | |
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.
There have been three observed occultations of stars by Eunike.
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