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76 Freia

From Wikipedia, the free encyclopedia

76 Freia
A three-dimensional model of 76 Freia based on its light curve.
Discovery
Discovered byHeinrich d'Arrest
Discovery date21 October 1862
Designations
(76) Freia
Pronunciation/ˈfreɪ.ə/[1]
Named after
Freyja
Outermain belt[2] (Cybele)
AdjectivesFreian
Orbital characteristics
Epoch 31 December 2006 (JD 2454100.5)
Aphelion594.715 Gm (3.975 AU)
Perihelion427.898 Gm (2.860 AU)
511.306 Gm (3.418AU)
Eccentricity0.163
2307.979 d (6.32a)
16.00 km/s
299.268°
Inclination2.116°
204.535°
254.070°
Physical characteristics
Dimensions183.7±4 km[2]
Mass(1.97 ± 4.20) × 1018 kg[3]
0.79 ± 1.69[3] g/cm3
0.0513 m/s2
Equatorialescape velocity
0.0971 km/s
9.968240±0.000009 h[4]
0.036[5]
CP
7.90

76 Freia is a very largemain-beltasteroid. It orbits in the outer part of the asteroid belt and is classified as aCybele asteroid.[6] Its composition is very primitive and it is extremely dark in color. Freia was discovered by theastronomerHeinrich d'Arrest on 21 October 1862, inCopenhagen, Denmark. It was his first and only asteroid discovery. It is named after the goddessFreyja inNorse mythology.

The siderealorbital period of this asteroid iscommensurable with that ofJupiter, which made it useful for ground-based mass estimates of thegiant planet.[7] A shape model for the asteroid was published by Stephens and Warner (2008), based uponlightcurve data. This yielded a siderealrotation period of9.968240±0.000009 h. They found two possible solutions for the spin axis, with the preferred solution inecliptic coordinates being (λ, β) = (139°±5°,25°±5°).[4]

References

[edit]
  1. ^"Freya".Lexico UK English Dictionary.Oxford University Press. Archived fromthe original on 22 March 2020.
  2. ^ab"JPL Small-Body Database Browser: 76 Freia" (2008-03-04 last obs). Retrieved5 September 2010.
  3. ^abCarry, 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.
  4. ^abStephens, 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 SetsArchived 2009-12-17 at theWayback 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,S2CID 119383924.
  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.

External links

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