|Discovered by||Jean Chacornac|
|Discovery date||September 12, 1860|
|Minor planet category||Main belt|
|Epoch December 31, 2006 (JD 2454100.5)|
|Aphelion||453.624 Gm (3.032 AU)|
|Perihelion||358.808 Gm (2.398 AU)|
|Semi-major axis||406.216 Gm (2.715 AU)|
|Orbital period||1634.355 d (4.47 a)|
|Average orbital speed||18.01 km/s|
|Longitude of ascending node||170.209°|
|Argument of perihelion||210.901°|
|Mass||(3.00 ± 0.50) × 1018 kg|
|Mean density||1.30 ± 0.26 g/cm3|
|Equatorial surface gravity||0.0461 m/s²|
|Escape velocity||0.0871 km/s|
|Absolute magnitude (H)||7.93|
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.
- "JPL Small-Body Database Browser: 59 Elpis". Jet Propulsion Laboratory. 2011-09-01 last obs. Retrieved 2012-01-26.
- 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.
- Asteroid Data Sets
- Appletons' annual cyclopaedia and register of important events of the year: 1862. New York: D. Appleton & Company. 1863. p. 173.
- Lutz D. Schmadel, Dictionary of Minor Planet Names, p.20-1.
- "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. Retrieved 2012-01-26.
|This article about a C-type asteroid native to the main belt is a stub. You can help Wikipedia by expanding it.|