Английская Википедия:21900 Orus

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21900 Orus Шаблон:IPAc-en is a Jupiter trojan asteroid from the Greek camp, approximately Шаблон:Convert in diameter, and a target of the Lucy mission to be visited in November 2028.[1] It is among the 100 largest Jupiter trojans and has a rotation period of 13.5 hours.[2] It was discovered on 9 November 1999, by Japanese amateur astronomer Takao Kobayashi at his private Ōizumi Observatory in Gunma Prefecture, Japan, and later named Orus after a slain Achaean warrior from the Iliad.[3]

Orbit and classification

Файл:Animation of Lucy's trajectory around Sun.gif
Animation of Lucy's trajectory around Sun
Шаблон:Legend2Шаблон:·Шаблон:Legend2Шаблон:·Шаблон:Legend2Шаблон:·Шаблон:Legend2Шаблон:·Шаблон:Legend2Шаблон:·Шаблон:Legend2Шаблон:·Шаблон:Legend2

Orus is a dark Jupiter trojan asteroid orbiting in the leading Greek camp at Jupiter's Шаблон:L4 Lagrangian point, 60° ahead of its orbit in a 1:1 resonance Шаблон:Crossreference. It is also a non-family asteroid in the Jovian background population.[4]

It orbits the Sun at a distance of 4.9–5.3 AU once every 11 years and 7 months (4,240 days; semi-major axis of 5.13 AU). Its orbit has an eccentricity of 0.04 and an inclination of 8° with respect to the ecliptic.[5] The body's observation arc begins with a precovery, published by the Digitized Sky Survey and taken at Palomar Observatory in November 1951, or 48 years prior to its official discovery observation.[3]

Lucy mission target

Orus is planned to be visited by the Lucy spacecraft which was launched in 2021. The flyby is scheduled for 20 November 2028, and will approach the asteroid to a distance of Шаблон:Cvt at a relative velocity of Шаблон:Cvt.[1]

Physical characteristics

Orus is characterized as a D-type and C-type asteroid by the Lucy mission team and by Pan-STARRS photometric survey, respectively.[1][6] It has a V–I color index of 0.95, seem among most larger D-type Jupiter trojans.[2]

Lightcurve

The first photometric observations of Orus have been made in October 2009, by astronomer Stefano Mottola in a photometric lightcurve survey of 80 Jupiter trojans, using the 1.2-meter telescope at Calar Alto Observatory. The obtained rotational lightcurve rendered a period of Шаблон:Val hours with a brightness variation of 0.18 magnitude (Шаблон:Small).[2][7]

In 2016, Mottola published a revised rotation period of Шаблон:Val, from ground-based observations taken over five apparitions in support of the Lucy mission. He finds that Orus is a retrograde rotator. The lightcurve suggests the presence of a large crater in the proximity of its north pole.[8]

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the body has an albedo of 0.083 and 0.075, with a diameter of 53.87 and 50.81 kilometers, respectively.[9][10] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous C-type asteroids of 0.057 and calculates a diameter of 55.67 kilometers with an absolute magnitude of 10.0.[2]

Naming

This minor planet was named from Greek mythology after Orus, an Achaean warrior in Homer's Iliad. He was killed in the Trojan War by the Trojan prince Hector, after whom the largest Jupiter trojan 624 Hektor is named.[3] The approved naming citation was published by the Minor Planet Center on 22 February 2016 (Шаблон:Small).[11]

Possible satellite

Файл:21900 Orus Hubble.jpg
Orus imaged by the Hubble Space Telescope in 2018.[12][13]

Orus has a candidate satellite, detected while searching through Hubble images taken on 7–8 August 2018.[13] Further observations are needed to determine physical characteristics of the satellite, which can help measure the mass of the primary.

See also

References

Шаблон:Reflist

External links

Шаблон:Minor planets navigator Шаблон:Small Solar System bodies Шаблон:Authority control

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  1. ↑ 1,0 1,1 1,2 Ошибка цитирования Неверный тег <ref>; для сносок Levison-2017 не указан текст
  2. ↑ 2,0 2,1 2,2 2,3 Ошибка цитирования Неверный тег <ref>; для сносок lcdb не указан текст
  3. ↑ 3,0 3,1 3,2 Ошибка цитирования Неверный тег <ref>; для сносок MPC-object не указан текст
  4. ↑ Ошибка цитирования Неверный тег <ref>; для сносок AstDys-object не указан текст
  5. ↑ Ошибка цитирования Неверный тег <ref>; для сносок jpldata не указан текст
  6. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Veres-2015 не указан текст
  7. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Mottola-2011 не указан текст
  8. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Mottola-2016 не указан текст
  9. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Grav-2012 не указан текст
  10. ↑ Ошибка цитирования Неверный тег <ref>; для сносок AKARI не указан текст
  11. ↑ Ошибка цитирования Неверный тег <ref>; для сносок MPC-Circulars-Archive не указан текст
  12. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Proposal_15622 не указан текст
  13. ↑ 13,0 13,1 Шаблон:Citation
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