 | |
| 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 |
| 4.68yr (1709.3d) | |
| 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] |
Meandensity | 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, stonymain-beltasteroid that was discovered by the French astronomerAuguste Charlois on January 17, 1893, inNice.[6]
Photometric observations of this asteroid gave alight 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 anS-type asteroid and has an estimated size of 154.34 km.[4] The spectrum of 354 Eleonora reveals the strong presence of the mineralolivine, a relative rarity in the asteroid belt.[8]
During favorableoppositions, such as in 1968 and 2010, Eleonora can reach anapparent magnitude of +9.31.
_mathilde.jpg) | This article about an S-type asteroid native to theasteroid belt is astub. You can help Wikipedia byexpanding it. |
