Discovered by Auguste Charlois Alternative names 1893 A Observation arc 123.16 yr (44983 d) Discovered 17 January 1893 Orbits Sun Discovery site Nice Observatory | Discovery date 17 January 1893 Minor planet category Main belt Aphelion 3.1188 AU (466.57 Gm) Inclination 18.403° Discoverer Auguste Charlois Asteroid group Asteroid belt | |
 | ||
Similar Auguste Charlois discoveries, Other celestial objects | ||
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 relatively rarity in the asteroid belt.
During favorable oppositions, such as in 1968 and 2010, Eleonora can reach an apparent magnitude of +9.31.