Английская Википедия:751 Faïna

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751 Faïna (prov. designation: Шаблон:Mp or Шаблон:Mp) is a very large background asteroid from the central regions of the asteroid belt, approximately Шаблон:Convert in diameter. It was discovered on 28 April 1913, by Russian astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula.[1] The elongated C-type asteroid (Ch) has a rotation period of 23.7 hours. It was named after Faina Mikhajlovna Neujmina, colleague and first wife of the discoverer.[2]

Orbit and classification

Located close to the region of the stony Eunomia family (Шаблон:Small),[3] Faïna is a non-family asteroid of the main belt's background population when applying the modern synthetic hierarchical clustering method (HCM) by Nesvorný as well as Milani and Knežević (AstDys).[4][5] However, in the 1995 HCM-analysis by Zappalà,[6] Faïna is the parent body of the tiny Faïna family,[6] which is not recognized by modern analysis. The HCM-method is based on an object's proper orbital elements to group asteroids into families.

Faïna orbits the Sun in the central asteroid belt at a distance of 2.2–2.9 AU once every 4 years and 1 month (1,489 days; semi-major axis of 2.55 AU). Its orbit has an eccentricity of 0.15 and an inclination of 16° with respect to the ecliptic.[7] The body's observation arc begins at Vienna Observatory on 8 May 2013, or two weeks after its official discovery observation by Grigory Neujmin at Simeiz.[1]

Naming

This minor planet was named after Faina Mikhajlovna Neujmina, the first wife of the discoverer. Astronomer Lutz Schmadel compiled this Шаблон:MoMP, based on his private communication with "N. S. Samojlova-Yakhontova", as neither the Minor Planet Circulars nor The Names of the Minor Planets give any information about this asteroid's name.[2][8]

Physical characteristics

In the Tholen classification, Faïna is a common, carbonaceous C-type asteroid, while in the Bus–Binzel SMASS classification, it is a hydrated carbonaceous Ch-type.[7][5]

Rotation period

In late 1988, a rotational lightcurve of Faïna was obtained from photometric observations by Richard Miles at the Manley Observatory near Chester in northwest England. Lightcurve analysis gave a well-defined rotation period of Шаблон:Val hours with a brightness variation of Шаблон:Val magnitude (Шаблон:Small).[9] Alternative observations by Roberto Crippa, Federico Manzini (2006) as well as by Bruno Christmann (2019) determined a period of Шаблон:Val+ and (Шаблон:Val) hours (or half the period) with an amplitude of Шаблон:Val and Шаблон:Val magnitude (Шаблон:Small).[3][10]

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite, the Infrared Astronomical Satellite IRAS, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Faïna measures (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val) kilometers in diameter and its surface has a low albedo of (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val), respectively.[11][12][13][14]

The Collaborative Asteroid Lightcurve Link adopts the results from IRAS, that is, an albedo of 0.0497 and a diameter of 110.50 kilometers based on an absolute magnitude of 8.66.[3] The WISE team also published several alternative mean-diameters of (Шаблон:Val), (Шаблон:Val), (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val), with a corresponding albedo of (Шаблон:Val), (Шаблон:Val), (Шаблон:Val), (Шаблон:Val), and (Шаблон:Val).[5][3]

On 28 March 2007, an asteroid occultation of Faïna gave a best-fit ellipse dimension of (Шаблон:Val) with a quality rating of 2, indicating its irregular, elongated shape. Another occultation on 21 October 2012, gave an ellipse of (Шаблон:Val). These timed observations are taken when the asteroid passes in front of a distant star.[5]

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. ↑ 3,0 3,1 3,2 3,3 Ошибка цитирования Неверный тег <ref>; для сносок lcdb не указан текст
  4. ↑ Ошибка цитирования Неверный тег <ref>; для сносок AstDys-object не указан текст
  5. ↑ 5,0 5,1 5,2 5,3 Ошибка цитирования Неверный тег <ref>; для сносок Ferret не указан текст
  6. ↑ 6,0 6,1 Ошибка цитирования Неверный тег <ref>; для сносок Zappala-family не указан текст
  7. ↑ 7,0 7,1 Ошибка цитирования Неверный тег <ref>; для сносок jpldata не указан текст
  8. ↑ Ошибка цитирования Неверный тег <ref>; для сносок DoMP не указан текст
  9. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Miles-1989 не указан текст
  10. ↑ Ошибка цитирования Неверный тег <ref>; для сносок geneva-obs не указан текст
  11. ↑ Ошибка цитирования Неверный тег <ref>; для сносок AKARI не указан текст
  12. ↑ Ошибка цитирования Неверный тег <ref>; для сносок SIMPS не указан текст
  13. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Mainzer-2016 не указан текст
  14. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Masiero-2014 не указан текст
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