354 Eleonora is a large, stony main-belt asteroid that was discovered by the French astronomer Auguste Charlois on January 17, 1893, in Nice. This asteroid is orbiting the Sun at a distance of with a moderate eccentricity (ovalness) of 0.11 and an orbital period of 4.68 years. The orbital plane is inclined at an angle of 18.4° to the plane of the ecliptic.
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 a stony 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. The surface spectrum is consistent with fine-grained material consisting of 60–70% olivine and 7–8% nickel.
During favorable oppositions, such as in 1968 and 2010, Eleonora can reach an apparent magnitude of +9.31.
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