2241 Alcathous

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2241 Alcathous Script error: No such module "IPAc-en". is a large Jupiter trojan from the Trojan camp, approximately Script error: No such module "convert". in diameter. It was discovered on 22 November 1979, by American astronomer Charles Kowal at the Palomar Observatory in southern California, United States.[1] The dark D-type asteroid belongs to the 20 largest Jupiter trojans and has a rotation period of 7.7 hours.[2] It was named after Alcathous from Greek mythology.[3]

Orbit and classification

Alcathous is a dark Jovian asteroid orbiting in the trailing Trojan camp at Jupiter's L5 Lagrangian point, 60° behind its orbit in a 1:1 resonance Template:Crossreference. It is also a non-family asteroid of the Jovian background population.[4][5]

It orbits the Sun at a distance of 4.8–5.5 AU once every 11 years and 10 months (4,309 days; semi-major axis of 5.18 AU). Its orbit has an eccentricity of 0.07 and an inclination of 17° with respect to the ecliptic.[6] The body's observation arc begins with a precovery taken at Palomar in June 1950, more than 29 years prior to its official discovery observation.[1]

Physical characteristics

In the Tholen, Barucci and Tedesco taxonomy, Alcathous is classified as a dark D-type asteroid.[5] It is the 8th largest of all 46 D-type asteroids in the Tholen classification.[7]

Rotation period

A large number rotational lightcurves have been obtained since December 1991,[2] when Alcathous was first observed by Stefano Mottola with the Loiano 1.52-meter telescope at Bologna Observatory, Italy.[8] In 1994, the asteroid's rotation period was also measured by Giovanni de Sanctis and collaborators (U=2/1Script error: No such module "Check for unknown parameters".).[9]

Several photometric observations between 2010 and 2017, by Daniel Coley and Robert Stephens at the Center for Solar System Studies and at GMARS Template:Obscode, also include the so-far best-rated period of 7.689 hours with a brightness amplitude of 0.22 magnitude (U=2+/3-/3/3/3-Script error: No such module "Check for unknown parameters".).[10][11][12][13][14]Template:Efn

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Alcathous measures between 113.68 and 118.87 kilometers in diameter and its surface has an albedo between 0.044 and 0.048.[15][16][17] The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0471 and a diameter of 114.63 kilometers based on an absolute magnitude of 8.64.[2]

Template:Largest Jupiter trojans

Naming

This minor planet was named after Alcathous, brave and handsome Trojan leader in Homer's Iliad. Alcathous was the husband of Hippodamia Template:Crossreference the eldest daughter of Anchises (also see Template:MoMP), who excelled all other girls of her age in beauty, skill and wit. Alcathous, previously uninjured in the Trojan War, was struck by Poseidon (also see Template:MoMP) with blindness and paralysis and was killed easily by a spear thrown by the Greek general and Cretan commander, Idomeneus (also see Template:MoMP).[3] The official naming citation was published by the Minor Planet Center on 10 November 1992 (M.P.C. 21128Script error: No such module "Check for unknown parameters".).[18]

Notes

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References

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  5. ↑ a b Script error: No such module "citation/CS1".
  6. ↑ Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ Script error: No such module "Citation/CS1".
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "Citation/CS1".
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  13. ↑ Script error: No such module "Citation/CS1".
  14. ↑ Script error: No such module "Citation/CS1".
  15. ↑ Script error: No such module "Citation/CS1". (online catalog)
  16. ↑ Script error: No such module "Citation/CS1".
  17. ↑ Script error: No such module "Citation/CS1". (online, AcuA catalog p. 153)
  18. ↑ Script error: No such module "citation/CS1".

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External links

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