59 Elpis

Elpis, minor planet designation: 59 Elpis, is a large main belt asteroid that orbits the Sun with a period of 4.47 years. It is a C-type asteroid, meaning that it is very dark and carbonaceous in composition. In the Tholen scheme it has a classification of CP, while Bus and Binzen class it as type B.

59 Elpis
Orbital diagram
Discovery
Discovered byJean Chacornac
Discovery dateSeptember 12, 1860
Designations
MPC designation
(59) Elpis
Pronunciation/ˈɛlpɪs/
Named after
Elpis
Minor planet category
Main belt
AdjectivesElpidian /ɛlˈpɪdiən/
Orbital characteristics
Epoch December 31, 2006 (JD 2454100.5)
Aphelion453.624 Gm (3.032 AU)
Perihelion358.808 Gm (2.398 AU)
Semi-major axis
406.216 Gm (2.715 AU)
Eccentricity0.117
Orbital period (sidereal)
1634.355 d (4.47 a)
Mean anomaly
246.848°
Inclination8.631°
Longitude of ascending node
170.209°
210.901°
Physical characteristics
Dimensions164.8±6.0 km
Mass(3.00±0.50)×1018 kg
Mean density
1.30±0.26 g/cm3
Synodic rotation period
13.69 h
0.044
CP/B
7.93

    Elpis was discovered by Jean Chacornac from Paris, on September 12, 1860. It was Chacornac's sixth and final asteroid discovery.

    A controversy arose over the naming of Elpis. Urbain Le Verrier, director of the Paris Observatory, at first refused to allow Chacornac to name the object, because Leverrier was promoting a plan to reorganize asteroid nomenclature by naming them after their discoverers, rather than mythological figures. A protest arose among astronomers. At the Vienna Observatory, Edmund Weiss, who had been studying the asteroid, asked the observatory's director, Karl L. Littrow, to name it. Littrow chose Elpis, a Greek personification of hope, in reference to the favorable political conditions in Europe at the time. In 1862, Leverrier permitted Chacornac to choose a name, and he selected "Olympia" at the suggestion of John Russell Hind. However, Elpis is the name that stuck.

    Elpis has been studied by radar.

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