Back 354 Eleonora (كويكب) ARZ (354) Элеонора CE (354) Eleonora German 354 Ελεονώρα Greek 354 Eleonora Esperanto (354) Eleonora Spanish 354 Eleonora Basque سیارک ۳۵۴ Persian (354) Eleonora French 354 Eleonora Hungarian
 | |
| Discovery | |
|---|---|
| Discovered by | Auguste Charlois |
| Discovery date | 17 January 1893 |
| Designations | |
| (354) Eleonora | |
| Pronunciation | /ɛliəˈnɔːrə/[1] |
| 1893 A | |
| Main belt | |
| Adjectives | Eleonorian |
| Orbital characteristics[2] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 123.16 yr (44983 d) |
| Aphelion | 3.1188 AU (466.57 Gm) |
| Perihelion | 2.47676 AU (370.518 Gm) |
| 2.79777 AU (418.540 Gm) | |
| Eccentricity | 0.11474 |
| 4.68 yr (1709.3 d) | |
| 123.762° | |
| 0° 12m 38.196s / day | |
| Inclination | 18.403° |
| 140.37° | |
| 5.5215° | |
| Physical characteristics | |
| Dimensions | 0.25[a] |
| 165±3 km[3] 154.3±5.6 km[4] 148.970±0.425 km[5][2] | |
| Mass | (7.5±2.7)×1018 kg[3] (7.18±2.57)×1018 kg[4] (6.236 ± 1.305/1.214)×1018 kg[5] |
Mean density | 3.18±1.14 g/cm3[3] 3.73±1.39 g/cm3[4] 3.602 ± 0.754/0.701 g/cm3[5] |
| 4.277 h (0.1782 d)[2] | |
| 0.172[3] 0.201±0.052[2] | |
| S | |
| 6.15[2] | |
354 Eleonora is a large, stony main-belt asteroid that was discovered by the French astronomer Auguste Charlois on January 17, 1893, in Nice.[6]
Photometric observations of this asteroid gave a light curve with a period of 13.623 hours. The data was used to construct a model for the asteroid, revealing it to be a regular-shaped object, spinning about a pole with ecliptic coordinates (β, λ) = (+20°, 356°), although this is with an accuracy of only ±10°. The ratio of the major to minor axes lengths is roughly equal to 1.2.[7] It is classified as an S-type asteroid and has an estimated size of 154.34 km.[4] The spectrum of 354 Eleonora reveals the strong presence of the mineral olivine, a relative rarity in the asteroid belt.[8]
During favorable oppositions, such as in 1968 and 2010, Eleonora can reach an apparent magnitude of +9.31.
- ^ "Eleonora". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- ^ a b c d e Cite error: The named reference
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