354 Eleonora

354 Eleonora
	A three-dimensional model of 354 Eleonora based on its light curve
Discovery
Discovered by	Auguste Charlois
Discovery date	17 January 1893
Designations
MPC designation	(354) Eleonora
Pronunciation	/ɛliəˈnɔːrə/[1]
Alternative designations	1893 A
Minor planet category	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)
Semi-major axis	2.79777 AU (418.540 Gm)
Eccentricity	0.11474
Orbital period	4.68 yr (1709.3 d)
Mean anomaly	123.762°
Mean motion	0° 12m 38.196s / day
Inclination	18.403°
Longitude of ascending node	140.37°
Argument of perihelion	5.5215°
Physical characteristics
Dimensions	155.17±8.5 km[2]; 154.34 ± 5.65 km[3]
Mass	(7.18 ± 2.57) × 1018 kg[3]
Mean density	3.73 ± 1.39 g/cm3[3]
Rotation period	4.277 h (0.1782 d)
Geometric albedo	0.1948±0.023
Spectral type	S
Absolute magnitude (H)	6.44

Eleonora (minor planet designation: 354 Eleonora) is a large, stony main-belt asteroid that was discovered by the French astronomer Auguste Charlois on January 17, 1893, in Nice.[4]

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.[5] It is classified as an S-type asteroid and has an estimated size of 154.34 km.[3] The spectrum of 354 Eleonora reveals the strong presence of the mineral olivine, a relatively rarity in the asteroid belt.[6]

During favorable oppositions, such as in 1968 and 2010, Eleonora can reach an apparent magnitude of +9.31.

References

"Eleonora". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)
Yeomans, Donald K., "354 Eleonora", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 11 May 2016.
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 7 April 2013.
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

354 Eleonora at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
354 Eleonora at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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[1] "Eleonora". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)

[JPL-2] Yeomans, Donald K., "354 Eleonora", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 11 May 2016.

[Carry2012-3] 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.

[IAU_MPC-4] "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.

[Kaasalainen2002-5] 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.

[Burbine2000-6] 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.