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Semele (minor planet designation: 86 Semele) is a large and very dark main-belt asteroid with an orbital period of 5.5 years. It is rotating with a period of 16.6 hours, and varies in magnitude by 0.13 during each cycle.[4] This object is classified as a C-type asteroid and is probably composed of carbonates.

86 Semele
Orbit of 86 Semele on 1 Jan 2009
Discovery
Discovered byFriedrich Tietjen
Discovery dateJanuary 4, 1866
Designations
MPC designation
(86) Semele
Pronunciation/ˈsɛmɪlə/[1]
Named after
Semele
Minor planet category
Main belt
AdjectivesSemelean /sɛmɪˈleɪən/[2]
Orbital characteristics[3]
Epoch December 31, 2006 (JD 2454100.5)
Aphelion562.652 Gm (3.761 AU)
Perihelion369.116 Gm (2.467 AU)
Semi-major axis
465.884 Gm (3.114 AU)
Eccentricity0.208
Orbital period (sidereal)
2,007.366 d (5.50 a)
Average orbital speed
16.69 km/s
Mean anomaly
264.875°
Inclination4.822°
Longitude of ascending node
86.452°
Argument of perihelion
307.886°
Physical characteristics
Dimensions120.6 km
Mass1.8×1018 kg
Equatorial surface gravity
0.0337 m/s²
Equatorial escape velocity
0.0638 km/s
Synodic rotation period
16.641±0.001 h[4]
Geometric albedo
0.047 [5]
Spectral type
C
Absolute magnitude (H)
8.54

    Semele was discovered by German astronomer Friedrich Tietjen on January 4, 1866.[6] It was his first and only asteroid discovery. It is named after Semele, the mother of Dionysus in Greek mythology.

    The orbit of 86 Semele places it in a 13:6 mean motion resonance with the planet Jupiter. The computed Lyapunov time for this asteroid is only 6,000 years, indicating that it occupies a chaotic orbit that will change randomly over time because of gravitational perturbations of the planets. This Lyapunov time is the second lowest among the first 100 named minor planets.[7]


    References


    1. "Semele". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 1 March 2020.
    2. Robert Calverley Trevelyan (1898) Mallow and Asphadel, p. 4.
    3. Yeomans, Donald K., "86 Semele", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 7 April 2013.
    4. Pilcher, Frederick (July 2020). "Lightcurves and Rotation Periods of 83 Beatrix, 86 Semele, 118 Peitho 153 Hilda, 527 Euryanthe, and 549 Jessonda". Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers. 47 (3): 192–195. Bibcode:2020MPBu...47..192P.
    5. Asteroid Data Sets Archived 2009-12-17 at the Wayback Machine
    6. "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
    7. Šidlichovský, M. (1999), Svoren, J.; Pittich, E. M.; Rickman, H. (eds.), "Resonances and chaos in the asteroid belt", Evolution and source regions of asteroids and comets : proceedings of the 173rd colloquium of the International Astronomical Union, held in Tatranska Lomnica, Slovak Republic, August 24–28, 1998, pp. 297–308, Bibcode:1999esra.conf..297S.



    На других языках

    [de] (86) Semele

    (86) Semele ist ein Asteroid des äußeren Hauptgürtels, der am 4. Januar 1866 von dem deutschen Astronomen Friedrich Tietjen entdeckt wurde[1]. Es handelt sich dabei um Tietjen´s einzige Entdeckung im Asteroidengürtel.
    - [en] 86 Semele

    [es] (86) Semele

    (86) Semele es un asteroide que forma parte del cinturón de asteroides y fue descubierto por Friedrich Tietjen el 4 de enero de 1866 desde el observatorio de Berlín, Alemania. Está nombrado por Semele, un personaje de la mitología griega.[2]

    [ru] (86) Семела

    (86) Семела (лат. Semele) — астероид главного пояса, который был открыт 4 января 1866 года немецким астрономом Фридрихом Титьеном в Берлинской обсерватории и назван в честь Семелы, матери Диониса в древнегреческой мифологии[2].


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