![]() | |
Discovery | |
---|---|
Discovered by | Auguste Charlois |
Discovery date | 17 January 1893 |
Designations | |
(354) Eleonora | |
Pronunciation | /ɛliəˈnɔːrə/ [1] |
1893 A | |
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) |
2.79777 AU (418.540 Gm) | |
Eccentricity | 0.11474 |
4.68 yr (1709.3 d) | |
123.762 ° | |
0° 12m 38.196s / day | |
Inclination | 18.403° |
140.37° | |
5.5215° | |
Physical characteristics | |
Dimensions | c/a = 0.75±0.08 [3] |
165±3 km
[3] 154.3±5.6 km [4] 148.970±0.425 km [5] [2] | |
Mass | (7.5±2.7)×1018 kg
[3] (7.18±2.57)×1018 kg [4] (6.236 ± 1.305/1.214)×1018 kg [5] |
Mean
density | 3.18±1.14 g/cm3
[3] 3.73±1.39 g/cm3 [4] 3.602 ± 0.754/0.701 g/cm3 [5] |
4.277 h (0.1782 d) | |
0.172
[3] 0.201±0.052 [2] | |
S | |
6.15 [2] | |
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. [6]
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. [7] It is classified as an S-type asteroid and has an estimated size of 154.34 km. [4] The spectrum of 354 Eleonora reveals the strong presence of the mineral olivine, a relative rarity in the asteroid belt. [8]
During favorable oppositions, such as in 1968 and 2010, Eleonora can reach an apparent magnitude of +9.31.
![]() | |
Discovery | |
---|---|
Discovered by | Auguste Charlois |
Discovery date | 17 January 1893 |
Designations | |
(354) Eleonora | |
Pronunciation | /ɛliəˈnɔːrə/ [1] |
1893 A | |
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) |
2.79777 AU (418.540 Gm) | |
Eccentricity | 0.11474 |
4.68 yr (1709.3 d) | |
123.762 ° | |
0° 12m 38.196s / day | |
Inclination | 18.403° |
140.37° | |
5.5215° | |
Physical characteristics | |
Dimensions | c/a = 0.75±0.08 [3] |
165±3 km
[3] 154.3±5.6 km [4] 148.970±0.425 km [5] [2] | |
Mass | (7.5±2.7)×1018 kg
[3] (7.18±2.57)×1018 kg [4] (6.236 ± 1.305/1.214)×1018 kg [5] |
Mean
density | 3.18±1.14 g/cm3
[3] 3.73±1.39 g/cm3 [4] 3.602 ± 0.754/0.701 g/cm3 [5] |
4.277 h (0.1782 d) | |
0.172
[3] 0.201±0.052 [2] | |
S | |
6.15 [2] | |
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. [6]
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. [7] It is classified as an S-type asteroid and has an estimated size of 154.34 km. [4] The spectrum of 354 Eleonora reveals the strong presence of the mineral olivine, a relative rarity in the asteroid belt. [8]
During favorable oppositions, such as in 1968 and 2010, Eleonora can reach an apparent magnitude of +9.31.