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Polyxo (minor planet designation: 308 Polyxo) is a main-belt asteroid that was discovered by A. Borrelly on March 31, 1891, in Marseilles. It is orbiting the Sun at a distance of 2.75 AU with a low orbital eccentricity (ovalness) of 0.04 and a period of 4.56 yr. The orbital plane is tilted at an angle of 4.36° to the plane of the ecliptic.[2]

308 Polyxo
Discovery
Discovered byA. Borrelly
Discovery date31 March 1891
Designations
MPC designation
(308) Polyxo
Pronunciation/pəˈlɪksoʊ/[1]
Named after
Πολυξώ Polyxō
Minor planet category
Main belt
AdjectivesPolyxoian /pɒlɪkˈsoʊiən/
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc124.63 yr (45,521 d)
Aphelion2.860 AU (427.8 Gm)
Perihelion2.640 AU (394.9 Gm)
Semi-major axis
2.750 AU (411.4 Gm)
Eccentricity0.040003
Orbital period (sidereal)
4.56 yr (1,665.5 d)
Mean anomaly
70.4189°
Mean motion
0° 12m 58.158s / day
Inclination4.36141°
Longitude of ascending node
181.727°
Argument of perihelion
115.501°
Physical characteristics
Dimensions140.69±3.8 km[2]
130 km[3]
Synodic rotation period
12.031 ± 0.009 h (0.50129 ± 0.00038 d)[4]
Geometric albedo
0.043±0.002[5]
Spectral type
T[4] (Tholen)
Absolute magnitude (H)
8.17

    308 Polyxo is classified as a rare T-type asteroid, with a spectrum that bears some similarity to the Tagish Lake meteorite.[6] A spectral feature at a wavelength of 3.0 μm suggests aqueous alteration of some surface materials.[4] Photometric measurements reported in 1983 give a rotation period of 12.03 hours and a brightness variation of 0.20 in magnitude. The adaptive optics instrument at the W. M. Keck Observatory shows an oblate object with a diameter of 130 km. The size ratio between the major and minor axes is 1.26 ± 0.11.[3] Light curves for this object suggests it has a very irregular shape.[4]

    Stellar occultation events were observed for this asteroid during 2000 and 2004. The resulting chords provided cross-section diameter estimates of 144.4 and 117.1 km, respectively.[7]


    References


    1. Webster, Noah (1884), A Practical Dictionary of the English Language
    2. "308 Polyxo". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 11 May 2016.
    3. Marchis, F.; et al. (November 2006), "Shape, size and multiplicity of main-belt asteroids. I. Keck Adaptive Optics survey", Icarus, vol. 185, no. 1, pp. 39–63, Bibcode:2006Icar..185...39M, doi:10.1016/j.icarus.2006.06.001, PMC 2600456, PMID 19081813.
    4. Dotto, E.; et al. (December 2004), "308 Polyxo: ISO-SWS spectrum up to 26 micron", Astronomy and Astrophysics, 427: 1081–1084, Bibcode:2004A&A...427.1081D, doi:10.1051/0004-6361:20041638.
    5. Dotto, E.; et al. (October 2002), "ISO observations of low and moderate albedo asteroids. PHT-P and PHT-S results", Astronomy and Astrophysics, 393: 1065–1072, Bibcode:2002A&A...393.1065D, doi:10.1051/0004-6361:20021190.
    6. Hiroi, Takahiro; Hasegawa, Sunao (March 2003), "Revisiting the search for the parent body of the Tagish Lake meteorite - Case of a T/D asteroid 308 Polyxo", Antarctic Meteorite Research, 16: 176-184, Bibcode:2003AMR....16..176H.
    7. Shevchenko, Vasilij G.; Tedesco, Edward F. (September 2006), "Asteroid albedos deduced from stellar occultations", Icarus, 184 (1): 211–220, Bibcode:2006Icar..184..211S, doi:10.1016/j.icarus.2006.04.006.



    На других языках

    [de] (308) Polyxo

    (308) Polyxo ist ein Asteroid des Asteroiden-Hauptgürtels, der am 31. März 1891 von A. Borrelly am Observatorium von Marseille entdeckt wurde.
    - [en] 308 Polyxo

    [es] (308) Polyxo

    (308) Polyxo es un asteroide perteneciente al cinturón de asteroides descubierto por Alphonse Louis Nicolas Borrelly desde el observatorio de Marsella, Francia, el 31 de marzo de 1891. Está nombrado por Polixo, un personaje de la mitología griega.[2]

    [ru] (308) Поликсо

    (308) Поликсо (др.-греч. Πολυξώ) — астероид главного пояса, который принадлежит к редкому спектральному классу T. Он был открыт 31 марта 1891 года французским астрономом Альфонсом Борелли в обсерватории Марселя и назван в честь Поликсо, одной из гиад в древнегреческой мифологии[1].


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