59 Elpis
 A three-dimensional model of 59 Elpis based on its light curve | |
| Discovery | |
|---|---|
| Discovered by | Jean Chacornac |
| Discovery date | 12 September 1860 |
| Designations | |
| Pronunciation | /ˈɛlpɪs/ |
Named after | Elpis |
| Main belt | |
| Adjectives | Elpidian /ɛlˈpɪdiən/ |
| Orbital characteristics | |
| Epoch 31 December 2006 (JD 2454100.5) | |
| Aphelion | 453.624 million km (3.032 AU) |
| Perihelion | 358.808 million km (2.398 AU) |
| 406.216 million km (2.715 AU) | |
| Eccentricity | 0.117 |
| 1634.355 d (4.47 a) | |
| 246.848° | |
| Inclination | 8.631° |
| 170.209° | |
| 210.901° | |
| Physical characteristics | |
| Dimensions | 163.61±6.50 km (composite estimate) 164.8±6.0 km |
| Mass | (3.09±0.28)×1018 kg |
Mean density | 1.31 g/cm3 |
| 13.69 h | |
| 0.044 | |
| CP/B | |
| 7.93 | |
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.
Elpis was discovered by Jean Chacornac from Paris, on 12 September 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.
Notes
- ↑ Calculated from its standard gravitational parameter GM = 0.206±0.019 km3/s2.
- ↑ Assuming a diameter of 165 km.
References
- ↑ The Century Dictionary and Cyclopedia, under "Schwartz, Madame von"
- ↑ E.g.American ecclesiastical review, v. 21 (1899)
- ↑ Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73 (1): 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- 1 2 3 4 5 "JPL Small-Body Database Browser: 59 Elpis" (2011-09-01 last obs). Jet Propulsion Laboratory. Retrieved 26 January 2012.
- 1 2 Fuentes-Muñoz, Oscar; Farnocchia, Davide; Giorgini, Jon D.; Park, Ryan S. (1 December 2025). "Asteroid Mass Estimation by Mutual Perturbations During Close Encounters After Gaia Focused Product Release". The Astronomical Journal. 170 (6): 353. Bibcode:2025AJ....170..353F. doi:10.3847/1538-3881/ae0cc9. ISSN 0004-6256. S2CID 283347135.
- ↑ Asteroid Data Sets Archived 17 December 2009 at the Wayback Machine
- ↑ Rivkin, A. S.; et al. (September 2003), "Hydrogen concentrations on C-class asteroids derived from remote sensing", Meteoritics & Planetary Science, 38 (9): 1383–1398, Bibcode:2003M&PS...38.1383R, doi:10.1111/j.1945-5100.2003.tb00321.x.
- ↑ Appletons' annual cyclopaedia and register of important events of the year: 1862. New York: D. Appleton & Company. 1863. p. 173.
- ↑ Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names. Springer Science & Business Media. pp. 20–1. ISBN 978-3-540-00238-3.
- ↑ "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. Retrieved 26 January 2012.
External links
- 59 Elpis at AstDyS-2, Asteroids—Dynamic Site
- 59 Elpis at the JPL Small-Body Database
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