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Freia (minor planet designation: 76 Freia) is a very large main-belt asteroid. It orbits in the outer part of the asteroid belt and is classified as a Cybele asteroid.[6] Its composition is very primitive and it is extremely dark in color. Freia was discovered by the astronomer Heinrich d'Arrest on October 21, 1862, in Copenhagen, Denmark. It was his first and only asteroid discovery. It is named after the goddess Freyja in Norse mythology.

76 Freia
A three-dimensional model of 76 Freia based on its light curve.
Discovery
Discovered byHeinrich d'Arrest
Discovery dateOctober 21, 1862
Designations
MPC designation
(76) Freia
Pronunciation/ˈfreɪ.ə/[1]
Named after
Freyja
Minor planet category
Outer main belt[2] (Cybele)
AdjectivesFreian
Orbital characteristics
Epoch December 31, 2006 (JD 2454100.5)
Aphelion594.715 Gm (3.975 AU)
Perihelion427.898 Gm (2.860 AU)
Semi-major axis
511.306 Gm (3.418 AU)
Eccentricity0.163
Orbital period (sidereal)
2307.979 d (6.32 a)
Average orbital speed
16.00 km/s
Mean anomaly
299.268°
Inclination2.116°
Longitude of ascending node
204.535°
Argument of perihelion
254.070°
Physical characteristics
Dimensions183.7±4 km[2]
Mass(1.97 ± 4.20) × 1018 kg[3]
Mean density
0.79 ± 1.69[3] g/cm3
Equatorial surface gravity
0.0513 m/s2
Equatorial escape velocity
0.0971 km/s
Synodic rotation period
9.968240±0.000009 h[4]
Geometric albedo
0.036 [5]
Spectral type
CP
Absolute magnitude (H)
7.90

    The sidereal orbital period of this asteroid is commensurable with that of Jupiter, which made it useful for ground-based mass estimates of the giant planet.[7] A shape model for the asteroid was published by Stephens and Warner (2008), based upon lightcurve data. This yielded a sidereal rotation period of 9.968240±0.000009 h. They found two possible solutions for the spin axis, with the preferred solution in ecliptic coordinates being (λ, β) = (139°±5°, 25°±5°).[4]


    References


    1. "Freya". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 22 March 2020.
    2. "JPL Small-Body Database Browser: 76 Freia" (2008-03-04 last obs). Retrieved 5 September 2010.
    3. 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.
    4. Stephens, Robert D.; Warner, Brian D. (June 2008), "A Preliminary Shape and Spin Axis Model for 76 Freia", The Minor Planet Bulletin, 35 (2): 84−85, Bibcode:2008MPBu...35...84S.
    5. Asteroid Data Sets Archived 2009-12-17 at the Wayback Machine
    6. De Prá, M. N.; et al. (September 2018), "PRIMASS visits Hilda and Cybele groups", Icarus, 311: 35–51, arXiv:1711.02071, Bibcode:2018Icar..311...35D, doi:10.1016/j.icarus.2017.11.012.
    7. Klepczynski, W. J.; et al. (November 1971), "The Mass of Jupiter from the Motion of (76) Freia", Astronomical Journal, 76: 939, Bibcode:1971AJ.....76..939K, doi:10.1086/111204.



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    На других языках

    [de] (76) Freia

    (76) Freia ist ein Asteroid des Hauptgürtels, der am 21. Oktober 1862 von dem deutsch-dänischen Astronomen Heinrich Louis d’Arrest entdeckt wurde.[2] Der Körper war die einzige Entdeckung d´Arrests im Asteroidengürtel.
    - [en] 76 Freia

    [es] (76) Freia

    (76) Freia es un asteroide perteneciente al cinturón exterior de asteroides descubierto el 21 de octubre de 1862 por Heinrich Louis d'Arrest desde el observatorio universitario de Copenhague en Dinamarca. Está nombrado por Freyja, una diosa de la mitología nórdica.[2]

    [ru] (76) Фрейя

    (76) Фрейя (лат. Freia) — астероид внешней части главного пояса, который принадлежит к спектральному классу P. Он был открыт 21 октября 1862 года немецким астрономом Генрихом д’Арре в обсерватории Копенгагенского университета и назван в честь Фрейи, богини любви и красоты в германо-скандинавской мифологии[1].


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