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Polyhymnia (minor planet designation: 33 Polyhymnia) is a main belt asteroid that was discovered by French astronomer Jean Chacornac on October 28, 1854[1] and named after Polyhymnia, the Greek Muse of sacred hymns.

33 Polyhymnia
Orbit of 33 Polyhymnia (1 Jan 2009)
Discovery[1]
Discovered byJ. Chacornac
Discovery dateOctober 28, 1854
Designations
MPC designation
(33) Polyhymnia
Pronunciation/pɒliˈhɪmniə/[2]
Named after
Polyhymnia
Alternative designations
A887 HA; 1938 FE;
1953 AK; 1957 YL;
1963 DG; 1976 YT7
Minor planet category
Main belt
Orbital characteristics[3]
Epoch April 18, 2013 (JD 2456400.5)
Aphelion573.518 Gm (3.83373 AU)
Perihelion284.409 Gm (1.90116 AU)
Semi-major axis
428.964 Gm (2.86745 AU)
Eccentricity0.33698
Orbital period (sidereal)
1,773.541 d (4.86 a)
Mean anomaly
256.476°
Inclination1.869°
Longitude of ascending node
8.595°
Argument of perihelion
338.123°
Physical characteristics
Dimensions62±11 km[4]
50–120 km[5]
53.98±0.91 km[6]
Mass(6.20±0.74)×1018 kg[6]
Synodic rotation period
18.608 h (0.7753 d)[7]
Spectral type
S[3]
Absolute magnitude (H)
8.55[3]

    Photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces, New Mexico during 2008 gave a light curve with a period of 18.609 ± 0.002 hours and a brightness variation of 0.15 ± 0.02 in magnitude. This result is in good agreement with a previous study performed during 1980.[8] These results were re-examined with additional observations in 2011, yielding a refined estimate of 18.608 ± 0.001 hours and a brightness variation of 0.18 ± 0.02 magnitude.[7]

    Due to its high eccentricity (0.338), one of the highest for a lower numbered minor planet, on rare close approaches it can reach tenth magnitude, as on September 8, 2014, when it will be apparent magnitude 9.9 and 0.894 AU from Earth.[9] The orbit of 33 Polyhymnia puts it in a 22:9 mean motion resonance with the planet Jupiter. The computed Lyapunov time for this asteroid is 10,000 years, indicating that it occupies a chaotic orbit that will change randomly over time because of gravitational perturbations of the planets.[10] Measurements of the position for this asteroid from 1854 to 1969 were used to determination the gravitational influence of Jupiter upon 33 Polyhymnia. This yields an inverse mass ratio of 1,047.341 ± 0.011 for Jupiter relative to the sun.[11]

    Polyhymnia has been studied by radar.[12]


    References


    1. "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
    2. Noah Webster (1884) A Practical Dictionary of the English Language
    3. Yeomans, Donald K. "33 Polyhymnia". JPL Small-Body Database Browser. NASA Jet Propulsion Laboratory. Retrieved 7 April 2013.
    4. Magri, C.; et al. (December 1998), "Mainbelt Asteroids: Results of Arecibo and Goldstone Radar Observations of 37 Objects During 1980-1995" (PDF), Bulletin of the American Astronomical Society, 30: 1450, Bibcode:1998DPS....30.5516M, archived from the original (PDF) on 15 April 2012, retrieved 26 July 2011
    5. Conversion of Absolute Magnitude to Diameter Archived 2007-07-02 at the Wayback Machine
    6. Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, vol. 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
    7. Pilcher, Frederick (July 2011), "A Critical Re-Examination of the Rotation Period of 33 Polyhymnia", The Minor Planet Bulletin, vol. 38, no. 3, pp. 130–131, Bibcode:2011MPBu...38..130P.
    8. Pilcher, Frederick (January 2009), "Period Determinations for 33 Polyhymnia, 38 Leda, 50 Virginia, 189 Phthia, and 290 Bruna", The Minor Planet Bulletin, vol. 36, no. 1, pp. 25–27, Bibcode:2009MPBu...36...25P.
    9. "AstDyS (33) Polyhymnia Ephemerides for 8 Sept 2014". AstDyS-2 (Asteroids - Dynamic Site). Retrieved 23 January 2012.
    10. 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.
    11. Janiczek, P. M. (1970), "Jupiter's mass from its action on Polyhymnia", Bulletin of the Astronomical Society, vol. 2, p. 247, Bibcode:1970BAAS....2S.247J.
    12. "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. Retrieved 30 October 2011.



    На других языках

    [de] (33) Polyhymnia

    (33) Polyhymnia ist ein Asteroid des Hauptgürtels, der am 28. Oktober 1854 von Jean Chacornac entdeckt wurde.
    - [en] 33 Polyhymnia

    [es] (33) Polyhymnia

    (33) Polyhymnia es un asteroide que forma parte del cinturón de asteroides y fue descubierto por Jean Chacornac desde el observatorio de París, Francia, el 28 de octubre de 1854. Está nombrado por Polimnia, una musa de la mitología griega.[2]

    [fr] (33) Polymnie

    (33) Polymnie (désignation internationale (33) Polyhymnia) est un astéroïde de la ceinture principale découvert par Jean Chacornac le 28 octobre 1854. Il est nommé d'après Polymnie, muse de la rhétorique.

    [ru] (33) Полигимния

    (33) Полиги́мния (лат. Polyhymnia) — астероид главного пояса, принадлежащий к светлому спектральному классу S. Он был открыт 28 октября 1854 года французским астрономом Жаном Шакорнаком в Марсельской обсерватории, Франция и назван в честь Полигимнии, музы торжественных гимнов в древнегреческой мифологии[4].


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