Английская Википедия:786 Bredichina

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786 Bredichina (prov. designation: Шаблон:Mp or Шаблон:Mp) is a carbonaceous and very large background asteroid, approximately Шаблон:Convert in diameter, located in the outer region of the asteroid belt. It was discovered by German astronomer Franz Kaiser at the Heidelberg-Königstuhl State Observatory on 20 April 1914.[1] The elongated C-type asteroid has a longer than average rotation period of 29.4 hours. It was named after Russian astronomer Fyodor Bredikhin (1831–1904).[2]

Orbit and classification

Bredichina is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[3][4][5] It orbits the Sun in the outer main-belt at a distance of 2.7–3.7 AU once every 5 years and 8 months (2,068 days; semi-major axis of 3.18 AU). Its orbit has an eccentricity of 0.16 and an inclination of 15° with respect to the ecliptic.[6] The body's observation arc begins at Heidelberg Observatory on 21 April 1914, the night after its official discovery observation.[1]

Naming

This minor planet was named after Fyodor Bredikhin (1831–1904), also known as Theodor or Feodor Alexandrovich Bredichin, a Russian astronomer and director of the Pulkovo Observatory. He has made important contributions to the study of comets. The Шаблон:MoMP was also mentioned in The Names of the Minor Planets by Paul Herget in 1955 (Шаблон:Small).[2] The lunar crater Bredikhin is also named after him.[7]

Physical characteristics

In the Tholen classification, Bredichina is a common, carbonaceous C-type asteroid.[6] It is also a C-type and C0-type in the Tedesco and Barucci classification from the 1908s.[4]

Rotation period

In March 2015, a rotational lightcurve of Bredichina was obtained from photometric observations by Spanish astronomers Alfonso Carreño Шаблон:Obscode, Amadeo Aznar Шаблон:Obscode, Enrique Arce Шаблон:Obscode, Pedro Brines Шаблон:Obscode, and Juan Lozano Шаблон:Obscode. Lightcurve analysis gave a rotation period of Шаблон:Val hours with a brightness variation of Шаблон:Val magnitude (Шаблон:Small).[8]

Previously, in August 2008, Argentine astronomer Ricardo Gil-Hutton derived period of Шаблон:Val hours with an amplitude of Шаблон:Val magnitude (Шаблон:Small).[9] Tentative measurements were also made by Italian Nicola Cornero and Federico Manzini at the Sozzago Astronomical Station Шаблон:Obscode in May 2010, which gave a period of Шаблон:Val hours with an amplitude of Шаблон:Val magnitude (Шаблон:Small).[10] The same period was also determined by Eric Barbotin in February 2020, though with a higher brightness variation of Шаблон:Val.[10]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), and the Japanese Akari satellite, Bredichina measures (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val) kilometers in diameter and its surface has an albedo of (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val), respectively.[11][12][13] The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0730 and a diameter of 91.60 kilometers based on an absolute magnitude of 8.65,[14] while Carry give a diameter of Шаблон:Val and estimates a mass of Шаблон:Val kilogramm.[15] Alternative mean-diameter measurements published by the WISE team include (Шаблон:Val), (Шаблон:Val), (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val) with corresponding albedos of (Шаблон:Val), (Шаблон:Val), (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val).[4][14]

On 10 January 2015, an asteroid occultation of Bredichina gave a best-fit ellipse dimension of (Шаблон:Val), indicative of a highly elongated shape, with a good quality rating of 3. These timed observations are taken when the asteroid passes in front of a distant star.[4]

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 Ошибка цитирования Неверный тег <ref>; для сносок MPC-object не указан текст
  2. ↑ 2,0 2,1 Ошибка цитирования Неверный тег <ref>; для сносок springer не указан текст
  3. ↑ Ошибка цитирования Неверный тег <ref>; для сносок AstDys-object не указан текст
  4. ↑ 4,0 4,1 4,2 4,3 Ошибка цитирования Неверный тег <ref>; для сносок Ferret не указан текст
  5. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Zappala-family не указан текст
  6. ↑ 6,0 6,1 Ошибка цитирования Неверный тег <ref>; для сносок jpldata не указан текст
  7. ↑ Ошибка цитирования Неверный тег <ref>; для сносок WGPN не указан текст
  8. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Garceran-2015 не указан текст
  9. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Gil-Hutton-2003 не указан текст
  10. ↑ 10,0 10,1 Ошибка цитирования Неверный тег <ref>; для сносок geneva-obs не указан текст
  11. ↑ Ошибка цитирования Неверный тег <ref>; для сносок SIMPS не указан текст
  12. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Mainzer-2016 не указан текст
  13. ↑ Ошибка цитирования Неверный тег <ref>; для сносок AKARI не указан текст
  14. ↑ 14,0 14,1 Ошибка цитирования Неверный тег <ref>; для сносок lcdb не указан текст
  15. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Carry-2012 не указан текст
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