354 Eleonora Explained

Minorplanet:yes
Background:
  1. D6D6D6
354 Eleonora
Discoverer:Auguste Charlois
Discovered:17 January 1893
Mpc Name:(354) Eleonora
Adjective:Eleonorian
Alt Names:1893 A
Mp Category:Main belt
Epoch:31 July 2016 (JD 2457600.5)
Semimajor:2.79777AU
Perihelion:2.47676AU
Aphelion:3.1188abbr=onNaNabbr=on
Eccentricity:0.11474
Period:4.68 yr (1709.3 d)
Inclination:18.403°
Asc Node:140.37°
Arg Peri:5.5215°
Mean Anomaly:123.762°
Dimensions:c/a =
Mean Diameter:[1]

Mass:

Density:

3.602 ± 0.754/0.701 g/cm
Rotation:4.277abbr=onNaNabbr=on
Spectral Type:S
Abs Magnitude:6.15
Albedo:0.172
Mean Motion: / day
Observation Arc:123.16 yr (44983 d)
Uncertainty:0

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 relative rarity in the asteroid belt.

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

Notes and References

  1. P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56