76 Freia
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| Lua error in package.lua at line 80: module 'Module:InfoboxImage/data' not found. A three-dimensional model of 76 Freia based on its light curve. | |
| Discovery | |
|---|---|
| Discovered by | Heinrich d'Arrest |
| Discovery date | 21 October 1862 |
| Designations | |
| Pronunciation | /ˈfreɪ.ə/[1] |
Named after | Freyja |
| Outer main belt[2] (Cybele) | |
| Adjectives | Freian |
| Orbital characteristics | |
| Epoch 31 December 2006 (JD 2454100.5) | |
| Aphelion | 594.715 million km (3.975 AU) |
| Perihelion | 427.898 million km (2.860 AU) |
| 511.306 million km (3.418 AU) | |
| Eccentricity | 0.163 |
| 2307.979 d (6.32 a) | |
Average orbital speed | 16.00 km/s |
| 299.268° | |
| Inclination | 2.116° |
| 204.535° | |
| 254.070° | |
| Physical characteristics | |
| Dimensions | 183.7±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 |
| 9.968240±0.000009 h[4] | |
| 0.036[5] | |
| CP | |
| 7.90 | |
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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 21 October 1862, in Copenhagen, Denmark. It was his first and only asteroid discovery. It is named after the goddess Freyja in Norse mythology.
It is orbiting the Sun at a distance of 3.42 AU with a moderate eccentricity (ovalness) of 0.16 and an orbital period of 6.32 years. The orbital plane is inclined at an angle of 2.116° relative to the plane of the ecliptic. Based on infrared measurements, it has a diameter of 184 km. The asteroid has a Tholen spectral type of P.[2]
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
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- ^ Page Module:Citation/CS1/styles.css has no content."Freya". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 22 March 2020.
- ^ a b c Page Module:Citation/CS1/styles.css has no content."JPL Small-Body Database Browser: 76 Freia" (2008-03-04 last obs). Retrieved 5 September 2010.
- ^ a b Page Module:Citation/CS1/styles.css has no content.Carry, 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.
- ^ a b Page Module:Citation/CS1/styles.css has no content.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.
- ^ Asteroid Data Sets Script error: No such module "webarchive".
- ^ Page Module:Citation/CS1/styles.css has no content.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.
- ^ Page Module:Citation/CS1/styles.css has no content.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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