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Discovery
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| Discovered by | Auguste Charlois |
| Discovery date | January 17, 1893 |
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Designations
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| Alternate name(s) | 1893 A |
| Minor planet category |
Main belt |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 465.848 Gm (3.114 AU) |
| Perihelion | 371.553 Gm (2.484 AU) |
| Semi-major axis | 418.701 Gm (2.799 AU) |
| Eccentricity | 0.113 |
| Orbital period | 1710.242 d (4.68 a) |
| Average orbital speed | 17.8 km/s |
| Mean anomaly | 317.966° |
| Inclination | 18.385° |
| Longitude of ascending node | 140.51° |
| Argument of perihelion | 6.994° |
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Physical characteristics
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| Dimensions | 155.0 km |
| Mass | unknown |
| Mean density | unknown |
| Equatorial surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | unknown |
| Albedo | unknown |
| Temperature | unknown |
| Spectral type | S |
| Absolute magnitude (H) | 6.44 |
354 Eleonora is a very large main-belt asteroid. It is classified as an S-type asteroid.
It was discovered by Auguste Charlois on January 17, 1893, in Nice.
During favorable oppositions, such as in 1968 and 2010, Eleonora can reach an apparent magnitude of +9.31.
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