 | |
| Discovery | |
|---|---|
| Discovered by | Auguste Charlois |
| Discovery date | 17 January 1893 |
| Designations | |
| MPC designation | (354) Eleonora |
| Pronunciation | /ɛliəˈnɔːrə/ |
| Alternative designations | 1893 A |
| Minor planet category | Main belt |
| Adjectives | Eleonorian |
| Orbital characteristics | |
| 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) |
| Semi-major axis | 2.79777 AU (418.540 Gm) |
| Eccentricity | 0.11474 |
| Orbital period (sidereal) | 4.68 yr (1709.3 d) |
| Mean anomaly | 123.762° |
| Mean motion | 0° 12 38.196 / day |
| Inclination | 18.403° |
| Longitude of ascending node | 140.37° |
| Argument of perihelion | 5.5215° |
| Physical characteristics | |
| Dimensions | 0.25 |
| Mean diameter | 165±3 km 154.3±5.6 km 148.970±0.425 km |
| Mass | (7.5±2.7)×10 kg (7.18±2.57)×10 kg (6.236 ± 1.305/1.214)×10 kg |
| Mean density | 3.18±1.14 g/cm 3.73±1.39 g/cm 3.602 ± 0.754/0.701 g/cm |
| Synodic rotation period | 4.277 h (0.1782 d) |
| Geometric albedo | 0.172 0.201±0.052 |
| Spectral type | S |
| Absolute magnitude (H) | 6.15 |
354 Eleonora is a large, stony main-belt asteroid that was discovered by the French astronomer Auguste Charlois on January 17, 1893, in Nice.
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. It is classified as an S-type asteroid and has an estimated size of 154.34 km. The spectrum of 354 Eleonora reveals the strong presence of the mineral olivine, a relative rarity in the asteroid belt.
During favorable oppositions, such as in 1968 and 2010, Eleonora can reach an apparent magnitude of +9.31.
Notes
- Flattening derived from the maximum aspect ratio (c/a): , where (c/a) = 0.75±0.08.
, where (c/a) = 0.75±0.08.
References
- "Eleonora". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- ^ Yeomans, Donald K., "354 Eleonora", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 11 May 2016.
- ^ P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
- ^ 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, S2CID 119226456. See Table 1.
- ^ Fienga, A.; Avdellidou, C.; Hanuš, J. (February 2020). "Asteroid masses obtained with INPOP planetary ephemerides". Monthly Notices of the Royal Astronomical Society. 492 (1). doi:10.1093/mnras/stz3407.
- "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
- Kaasalainen, M.; et al. (October 2002), "Models of Twenty Asteroids from Photometric Data", Icarus, 159 (2): 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, vol. 35, pp. A35, Bibcode:2000M&PSA..35R..35B, doi:10.1111/j.1945-5100.2000.tb01796.x.
External links
- 354 Eleonora at AstDyS-2, Asteroids—Dynamic Site
- 354 Eleonora at the JPL Small-Body Database
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