354 Eleonora
|
A three-dimensional model of 354 Eleonora based on its light curve. | |
| Discovery | |
|---|---|
| Discovered by | Auguste Charlois |
| Discovery date | January 17, 1893 |
| Designations | |
| 1893 A | |
| Main belt | |
| Orbital characteristics[1] | |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 465.848 Gm (3.114 AU) |
| Perihelion | 371.553 Gm (2.484 AU) |
| 418.701 Gm (2.799 AU) | |
| Eccentricity | 0.113 |
| 1,710.242 d (4.68 a) | |
Average orbital speed | 17.8 km/s |
| 317.966° | |
| Inclination | 18.385° |
| 140.51° | |
| 6.994° | |
| Physical characteristics | |
| Dimensions | 154.34 ± 5.65[2] km |
| Mass | (7.18 ± 2.57) × 1018[2] kg |
Mean density | 3.73 ± 1.39[2] g/cm3 |
Spectral type | S |
| 6.44 | |
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354 Eleonora is a large, stony main-belt asteroid that was discovered by the French astronomer Auguste Charlois on January 17, 1893, in Nice.[3]
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.[4] It is classified as an S-type asteroid and has an estimated size of 154.34 km.[2] The spectrum of 354 Eleonora reveals the strong presence of the mineral Olivine, a relatively rarity in the asteroid belt.[5]
During favorable oppositions, such as in 1968 and 2010, Eleonora can reach an apparent magnitude of +9.31.
References
- ↑ Yeomans, Donald K., "354 Eleonora", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-04-07.
- 1 2 3 4 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- ↑ "Numbered Minor Planets 1–5000", Discovery Circumstances (IAU Minor Planet center), retrieved 2013-04-07.
- ↑ Kaasalainen, M.; et al. (October 2002), "Models of Twenty Asteroids from Photometric Data", Icarus 159 (2), pp. 369–395, Bibcode:2002Icar..159..369K, doi:10.1006/icar.2002.6907.
- ↑ Burbine, T. H.; et al. (July 2000), "The Nature of Olivine Asteroids", Meteoritics & Planetary Science 35, pp. A35, Bibcode:2000M&PSA..35R..35B, doi:10.1111/j.1945-5100.2000.tb01796.x.
External links
- Orbital simulation from JPL (Java)
- Ephemeris
- 354 Eleonora at the JPL Small-Body Database
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