185 Eunike

Main-belt asteroid October 2019 yes (185) Eunike Орбита астероида 185.png Orbital diagram C. H. F. Peters, 1878 #D6D6D6 185 Eunike A878 EA j uː ' n aɪ k iːNoah Webster (1884) A Practical Dictionary of the English Language Eunikean j uː n ᵻ ˈ k iː ə n Εὐνίκη Eynīkē Main belt 2.7383 AU Gm on 2.3843 AU Gm on 3.0924 AU Gm on on 4.53 yr (1655.1 d) 23.238° 0.12930 1 March 1878 31 July 2016 (JD 2457600.5) 153.84° 224.01° 327.48° 0.21751 ms / day https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=185 185 Eunike JPL Small-Body Database NASA/Jet Propulsion Laboratory 12 May 2016 131.77 yr (48128 d) 0 1.41759 AU Gm on 2.40697 AU Gm on 3.222 160.61 ± 5.00 km (composite estimate)157.51 2.6 km 3.60 0.64 18 kgCalculated from its standard gravitational parameter GM = 0.240 0.043 km3/s2. 1.66 g/cm3 21.797 h d on on21.812 ± 0.001 hours C 7.62, 7.45 ± 0.01 0.0638 0.002 185 Eunike is a dark and very large main-belt asteroid. 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). This object is orbiting the Sun at a distance of 2.74 AU with an eccentricity of 0.129 and an orbital period of 4.53 years. Its orbital plane is inclined at an angle of 23.2° to the plane of the ecliptic. Using infrared measurements, the diameter has been measured at 160.464 km. It has a primitive carbonaceous composition. Based upon photometric observations made between 2010 and 2014, this asteroid has a rotation period of 21.8120.001 hours and a brightness variation of 0.080.01 in magnitude. At opposition, the absolute magnitude was measured at 7.450.01. 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.March 2026 Notes References B. Carry Density of asteroids Planetary and Space Science 73 98–118 December 2012 10.1016/j.pss.2012.03.009 2012P&SS...73...98C . 1203.4336 See Table 1. 1 Pilcher Frederick Behrend Raoul Bernasconi Laurent Franco Lorenzo Hills Kevin Martin Axel Ruthroff John C. A Comprehensive Photometric Investigation of 185 Eunike of the Minor Planets Section of the Association of Lunar and Planetary Observers October 2014 41 4 244–250 2014MPBu...41..244P . Fuentes-Muñoz Oscar Farnocchia Davide Giorgini Jon D. Park Ryan S. 2025-12-01 Asteroid Mass Estimation by Mutual Perturbations During Close Encounters After Gaia Focused Product Release The Astronomical Journal 170 6 353 10.3847/1538-3881/ae0cc9 0004-6256 free 2025AJ....170..353F 283347135 External links 185 184 Dejopeja 185 186 Celuta Category:Background asteroids Eunike Eunike Category:Objects observed by stellar occultation Category:C-type asteroids (Tholen) Category:C-type asteroids (SMASS) 18780301