354 Eleonora

Last updated

354 Eleonora
354 Eleonora VLT (2021), deconvolved.pdf
Discovery
Discovered by Auguste Charlois
Discovery date17 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
Dimensionsc/a = 0.75±0.08 [3]
Mean diameter
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.

    Related Research Articles

    <span class="mw-page-title-main">38 Leda</span> Main-belt asteroid

    Leda is a large, dark main-belt asteroid that was discovered by French astronomer J. Chacornac on January 12, 1856, and named after Leda, the mother of Helen of Troy in Greek mythology. In the Tholen classification system, it is categorized as a carbonaceous C-type asteroid, while the Bus asteroid taxonomy system lists it as a Cgh asteroid. The spectra of the asteroid displays evidence of aqueous alteration.

    <span class="mw-page-title-main">42 Isis</span> Main-belt asteroid

    Isis, minor planet designation: 42 Isis, is a large main-belt asteroid, measuring 100.2 km in diameter with a stony (S-type) composition. It was discovered by English astronomer N.R. Pogson on 23 May 1856 at Oxford, and was his first asteroid discovery. The asteroid's name was chosen by Manuel John Johnson, director of the Radcliffe Observatory in Oxford. Although Isis is the name of an Egyptian goddess, the name was chosen in homage to Pogson's astronomer daughter, (Elizabeth) Isis Pogson. In addition, the Isis is the stretch of the River Thames that runs through Oxford.

    <span class="mw-page-title-main">70 Panopaea</span> Main-belt asteroid

    Panopaea is a large main belt asteroid. Its orbit is close to those of the Eunomia asteroid family; however, Panopaea is a dark, primitive carbonaceous C-type asteroid in contrast to the S-type asteroids of the Eunomian asteroids. The spectra of the asteroid displays evidence of aqueous alteration. Photometric studies give a rotation period of 15.797 hours and an amplitude of 0.11±0.01 in magnitude. Previous studies that suggested the rotation period may be twice this amount were rejected based upon further observation.

    <span class="mw-page-title-main">78 Diana</span> Main-belt asteroid

    Diana is a large and dark main-belt asteroid. It was discovered by German astronomer Robert Luther on March 15, 1863, and named after Diana, Roman goddess of the hunt. The asteroid is orbiting the Sun at a distance of 2.620 AU with a period of 4.24 years and an eccentricity (ovalness) of 0.207. The orbital plane is tilted at an angle of 8.688° relative to the plane of the ecliptic. Its composition is carbonaceous and primitive.

    <span class="mw-page-title-main">111 Ate</span> Main-belt asteroid

    Ate is a main-belt asteroid discovered by the German-American astronomer C. H. F. Peters on August 14, 1870, and named after Ate, the goddess of mischief and destruction in Greek mythology. In the Tholen classification system, it is categorized as a carbonaceous C-type asteroid, while the Bus asteroid taxonomy system lists it as an Ch asteroid.

    <span class="mw-page-title-main">168 Sibylla</span> Outer main-belt asteroid

    168 Sibylla is a large main-belt asteroid, discovered by Canadian-American astronomer J. C. Watson on September 28, 1876. It was most likely named for the Sibyls, referring to the Ancient Greek female oracles. Based upon its spectrum this object is classified as a C-type asteroid, which indicates it is very dark and composed of primitive carbonaceous materials. 168 Sibylla is a Cybele asteroid, orbiting beyond most of the main-belt asteroids.

    <span class="mw-page-title-main">185 Eunike</span>

    Eunike is a dark and very large main-belt asteroid, with an approximate diameter of 157 kilometres. It has a primitive carbonaceous composition.

    <span class="mw-page-title-main">189 Phthia</span>

    Phthia is a bright-coloured, rocky main belt asteroid that was discovered by German-American astronomer Christian Heinrich Friedrich Peters on September 9, 1878 in Clinton, New York and named after Phthia, a region of Ancient Greece.

    <span class="mw-page-title-main">212 Medea</span> Main-belt asteroid

    Medea is a very large main-belt asteroid that was discovered by Johann Palisa on February 6, 1880, in Pola, and was named after Medea, a figure in Greek mythology.

    <span class="mw-page-title-main">230 Athamantis</span> Main-belt asteroid

    Athamantis is a fairly large main-belt asteroid that was discovered by the German-Austrian astronomer K. de Ball on September 3, 1882, in Bothkamp. It was his only asteroid discovery. The asteroid was named after Athamantis, daughter of Athamas the mythical Greek king of Orchomenus.

    <span class="mw-page-title-main">238 Hypatia</span> Main-belt asteroid

    Hypatia is a very large main-belt asteroid that was discovered by Russian astronomer Viktor Knorre on July 1, 1884, in Berlin. It was the third of his four asteroid discoveries. The name was given in honour of philosopher Hypatia of Alexandria. Based upon the spectrum, it is classified as a C-type asteroid and is probably composed of primitive carbonaceous material. Like many asteroids of this type, its surface is very dark in colour.

    <span class="mw-page-title-main">246 Asporina</span> Main-belt asteroid

    Asporina is a sizeable main-belt asteroid. It is classified as one of the few A-type asteroids.

    <span class="mw-page-title-main">266 Aline</span> Main-belt asteroid

    Aline is a fairly large main belt asteroid that was discovered by Johann Palisa on 17 May 1887 in Vienna and is thought to have been named after the daughter of astronomer Edmund Weiss. It is a dark C-type asteroid and is probably composed of primitive carbonaceous material. 266 Aline is orbiting close to a 5:2 mean motion resonance with Jupiter, which is located at 2.824 AU.

    <span class="mw-page-title-main">289 Nenetta</span> A-type asteroid in the Asteroid belt

    Nenetta is an A-type asteroid with a diameter of 38 km. It was discovered by Auguste Charlois on 10 March 1890 in Nice, France. The asteroid is orbiting the Sun at a distance of 2.87 AU with an eccentricity (ovalness) of 0.204 and an orbital period of 4.87 yr. The orbital plane is inclined at an angle of 6.7° to the plane of the ecliptic.

    <span class="mw-page-title-main">341 California</span> Main-belt asteroid

    California is an asteroid belonging to the Flora family in the Main Belt. It was discovered by Max Wolf on 25 September 1892 in Heidelberg, and is named for the U.S. state of California. This object is orbiting the Sun at a distance of 2.20 AU with a period of 3.26 yr and an eccentricity (ovalness) of 0.19. The orbital plane is inclined at an angle of 5.7° to the plane of the ecliptic.

    <span class="mw-page-title-main">409 Aspasia</span> Main-belt asteroid

    Aspasia is a large main-belt asteroid that was discovered by French astronomer Auguste Charlois on 9 December 1895 in Nice. It is classified as a CX-type asteroid.

    Chloris is a very large main-belt asteroid that was discovered by Auguste Charlois on January 7, 1896, in Nice. It is classified as a C-type asteroid and is probably composed of primitive carbonaceous material. The spectrum of the asteroid displays evidence of aqueous alteration. It is the namesake of the Chloris family of asteroids.

    Patientia is approximately the 15th-largest asteroid in the asteroid belt with a diameter of 225 km. It was discovered by French astronomer Auguste Charlois on 4 December 1899, and assigned a provisional designation 1899 EY.

    <span class="mw-page-title-main">497 Iva</span> Main-belt asteroid

    Iva is a main-belt asteroid orbiting the Sun, not to be confused with 1627 Ivar. It was discovered by American astronomer R. S. Dugan on 4 November 1902, and was named for Iva Shores, the young daughter of the family where he was staying in Heidelberg. This object is orbiting at a distance of 2.85 AU with a period of 4.82 yr and an eccentricity of 0.3. The orbital plane is inclined at an angle of 4.8° to the plane of the ecliptic.

    <span class="mw-page-title-main">584 Semiramis</span>

    Semiramis is a minor planet orbiting the Sun within the main asteroid belt. Photometric observations at the Mark Evans Observatory during 2014 gave a rotation period of 5.0689 ± 0.0001 hours. This value is in close agreement with previous studies. The spectrum shows it to be a stony S(IV)-type asteroid.

    References

    1. "Eleonora" . Oxford English Dictionary (Online ed.). Oxford University Press.(Subscription or participating institution membership required.)
    2. 1 2 3 4 Yeomans, Donald K., "354 Eleonora", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory , retrieved 11 May 2016.
    3. 1 2 3 4 5 P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
    4. 1 2 3 4 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73 (1): 98–118, arXiv: 1203.4336 , Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009, S2CID   119226456. See Table 1.
    5. 1 2 3 Fienga, A.; Avdellidou, C.; Hanuš, J. (February 2020). "Asteroid masses obtained with INPOP planetary ephemerides". Monthly Notices of the Royal Astronomical Society. 492 (1). doi: 10.1093/mnras/stz3407 .
    6. "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
    7. Kaasalainen, M.; et al. (October 2002), "Models of Twenty Asteroids from Photometric Data", Icarus, 159 (2): 369–395, Bibcode:2002Icar..159..369K, doi:10.1006/icar.2002.6907.
    8. Burbine, T. H.; et al. (July 2000), "The Nature of Olivine Asteroids", Meteoritics & Planetary Science, vol. 35, pp. A35, Bibcode:2000M&PSA..35R..35B, doi: 10.1111/j.1945-5100.2000.tb01796.x .