76 Freia

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76 Freia
76Freia (Lightcurve Inversion).png
A three-dimensional model of 76 Freia based on its light curve.
Discovery
Discovered by Heinrich d'Arrest
Discovery dateOctober 21, 1862
Designations
(76) Freia
Pronunciation /ˈfr.ə/ [1]
Named after
Freyja
Outer main belt [2] (Cybele)
Adjectives Freian
Orbital characteristics
Epoch December 31, 2006 (JD 2454100.5)
Aphelion 594.715 Gm (3.975 AU)
Perihelion 427.898 Gm (2.860 AU)
511.306 Gm (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
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
9.968240±0.000009 h [4]
0.036 [5]
CP
7.90

    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.

    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°±, 25°±). [4]

    Related Research Articles

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    1373 Cincinnati, provisional designation 1935 QN, is an asteroid in a comet-like orbit from the Cybele region, located at the outermost rim of the asteroid belt, approximately 20 kilometers in diameter. It was the only asteroid discovery made by famous American astronomer Edwin Hubble, while observing distant galaxies at Mount Wilson Observatory in California on 30 August 1935. The rather spherical X-type asteroid has a rotation period of 5.3 hours. It was named for the Cincinnati Observatory.

    <span class="mw-page-title-main">72 Feronia</span> Main-belt asteroid

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    <span class="mw-page-title-main">909 Ulla</span> Outer main-belt asteroid

    909 Ulla is a large and dark asteroid from the outermost regions of the asteroid belt, that measures approximately 116 kilometers in diameter. It is the parent body and namesake of the Ulla family, which belongs to the larger group of Cybele asteroids. It was discovered on 7 February 1919, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany. The X-type asteroid has a rotation period of 8.7 hours and a notably low value for its Jupiter Tisserand's parameter. It was named after Ulla Ahrens, daughter of a friend of the discoverer.

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    <span class="mw-page-title-main">1022 Olympiada</span>

    1022 Olympiada, provisional designation 1924 RT, is a background asteroid from the central regions of the asteroid belt, approximately 30 kilometers in diameter. It was discovered at the Simeiz Observatory on the Crimean peninsula on 23 June 1924, by Soviet astronomer Vladimir Albitsky, who named it after his mother, Olimpiada Albitskaya. The X-type asteroid has a short rotation period of 3.83 hours.

    <span class="mw-page-title-main">1103 Sequoia</span> Asteroid

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    1162 Larissa, provisional designation 1930 AC, is a metallic Hildian asteroid from the outermost regions of the asteroid belt, approximately 43 kilometers in diameter. It was discovered on 5 January 1930, by astronomer German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany. The asteroid was named after the Greek city of Larissa.

    3225 Hoag, provisional designation 1982 QQ, is a dynamical Hungaria asteroid from the innermost regions of the asteroid belt, approximately 5.5 kilometers in diameter. It was discovered on 20 August 1982, by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California. The stony S/L-type asteroid has a short rotation period of 2.37 hours. It was named for American astronomer Arthur Hoag.

    2363 Cebriones is a large Jupiter trojan from the Trojan camp, approximately 84 kilometers in diameter. It was discovered on 4 October 1977, by astronomers at the Purple Mountain Observatory in Nanking, China. The dark D-type asteroid is one of the 40 largest Jupiter trojans and has a rotation period of 20 hours. It was named after Cebriones, Hektor's charioteer from Greek mythology.

    <span class="mw-page-title-main">1382 Gerti</span> Asteroid

    1382 Gerti, provisional designation 1925 BB, is a Florian asteroid from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 21 January 1925, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid was named after a secretary of the Astronomical Calculation Institute, Gertrud Höhne.

    1467 Mashona, provisional designation 1938 OE, is a rare-type carbonaceous asteroid from the outer regions of the asteroid belt, approximately 100 kilometers in diameter, making it one of the top 200 largest asteroids currently known to exist. It was discovered on 30 July 1938, by South African astronomer Cyril Jackson at the Johannesburg Observatory in South Africa. It was later named after the native Shona people of Zimbabwe.

    1574 Meyer, provisional designation 1949 FD, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 59 kilometers in diameter. It was discovered on 22 March 1949, by French astronomer Louis Boyer at Algiers Observatory in Algeria, northern Africa. It was named after French astronomer M. Georges Meyer.

    <span class="mw-page-title-main">2606 Odessa</span>

    2606 Odessa, provisional designation 1976 GX2, is a background asteroid from the central regions of the asteroid belt, approximately 16 kilometers (10 miles) in diameter. It was discovered on 1 April 1976, by Soviet–Russian astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula. The presumably metallic X- or M-type asteroid has an elongated shape and a rotation period of 8.24 hours. It was named for the Ukrainian city of Odesa.

    1796 Riga, provisional designation 1966 KB, is a dark asteroid from the outer region of the asteroid belt, approximately 70 kilometers in diameter. It was discovered on 16 May 1966, by Russian astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula. It is named after the Latvian capital Riga.

    <span class="mw-page-title-main">1902 Shaposhnikov</span> Hilda asteroid

    1902 Shaposhnikov is a dark Hilda asteroid from the outermost region of the asteroid belt, approximately 92 kilometers in diameter. It was discovered on 18 April 1972, by Russian astronomer Tamara Smirnova at the Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula. The asteroid was named after Soviet astronomer and WWII casualty Vladimir Shaposhnikov. It was one of the last larger asteroids discovered in the main belt.

    1941 Wild, provisional designation 1931 TN1, is an eccentric Hildian asteroid from the outermost region of the asteroid belt, approximately 20 kilometers in diameter.

    References

    1. "Freya". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 22 March 2020.
    2. 1 2 "JPL Small-Body Database Browser: 76 Freia" (2008-03-04 last obs). Retrieved 5 September 2010.
    3. 1 2 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.
    4. 1 2 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, 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.