354 Eleonora

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354 Eleonora
354Eleonora (Lightcurve Inversion).png
A three-dimensional model of 354 Eleonora based on its light curve.
Discovery
Discovered by Auguste Charlois
Discovery date 17 January 1893
Designations
1893 A
Main belt
Orbital characteristics[1]
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)
17.8 km/s
123.762°
0° 12m 38.196s / day
Inclination 18.403°
140.37°
5.5215°
Earth MOID 1.48856 AU (222.685 Gm)
Jupiter MOID 1.90932 AU (285.630 Gm)
Jupiter Tisserand parameter 3.242
Physical characteristics
Dimensions 155.17±8.5 km[1]
154.34 ± 5.65 km[2]
Mass (7.18 ± 2.57) × 1018 kg[2]
Mean density
3.73 ± 1.39 g/cm3[2]
4.277 h (0.1782 d)
0.1948±0.023
S
6.44

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[edit]

  1. ^ a b Yeomans, Donald K., "354 Eleonora", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 11 May 2016. 
  2. ^ a b c d Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336free to read, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009.  See Table 1.
  3. ^ "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 2013-04-07. 
  4. ^ 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. 
  5. ^ 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[edit]