Английская Википедия:706 Hirundo

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706 Hirundo (prov. designation: Шаблон:Mp or Шаблон:Mp) is an elongated background asteroid, located in the central region of the asteroid belt. It was discovered by German astronomer Joseph Helffrich at the Heidelberg Observatory on 9 October 1910.[1] The carbonaceous C-type asteroid (Cgh) has a rotation period of 22.0 hours and measures approximately Шаблон:Convert in diameter. It was named after the bird genus Hirundo, commonly known as swallows.[2]

Orbit and classification

Файл:Animation of 706 Hirundo orbit 2000-2020.gif
Orbit of Шаблон:Legend2 (2000-2020)
Шаблон:Legend2Шаблон:·Шаблон:Legend2Шаблон:·Шаблон:Legend2

Hirundo 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 central asteroid belt at a distance of 2.2–3.3 AU once every 4 years and 6 months (1,647 days; semi-major axis of 2.73 AU). Its orbit has an eccentricity of 0.19 and an inclination of 14° with respect to the ecliptic.[6] The body's observation arc begins at Vienna Observatory on 16 October 1910, or six nights after its official discovery observation by Joseph Helffrich at Heidelberg.[1]

Naming

This minor planet was named after bird genus Hirundo, a group of passerines in the family Hirundinidae (swallows and martins).[2] "Hirundo" is Latin word for swallow. They are found all over the world with the exception of New Zealand and the polar regions. Known for their graceful flight and regular migrations, swallows feature a short bill with a wide gape, small weak feet, and typically a deeply forked tail. They feed on insects caught on the wing. The Шаблон:MoMP was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (Шаблон:Small).[2]

Physical characteristics

In both the Bus–Binzel (SMASS-II) and the Bus–DeMeo classification, Hirundo is a carbonaceous C-type asteroid (Cgh).[6][4][7]

Rotation period and poles

In September 2000, a rotational lightcurve of Hirundo was obtained from photometric observations by American Brian Warner at the Palmer Divide Observatory Шаблон:Obscode in Colorado. Lightcurve analysis gave a rotation period of Шаблон:Val hours with a high brightness variation of Шаблон:Val magnitude, indicative of an elongated shape (Шаблон:Small).[8]Шаблон:Efn During the same opposition, Bill Holliday measures a period of (Шаблон:Val) and an amplitude of (Шаблон:Val) magnitude at his River Oaks Observatory Шаблон:Obscode in New Braunfels, Texas (Шаблон:Small).[9] Further observations by René Roy (2011), Patrice Le Guen (2018), and Anaël Wünsche and Raoul Behrend (2020) determined a period of (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val) with an amplitude of (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val) magnitude, respectively (Шаблон:Small).[10]

Two lightcurves, published in 2016, using modeled photometric data from the Lowell Photometric Database (LPD) and other sources, gave a concurring period of (Шаблон:Val) and (Шаблон:Val) hours, respectively. Each modeled lightcurve also determined two spin axes of (92°, 66°) and (244°, 54°), as well as (91°, 70°) and (250°, 45°) in ecliptic coordinates (λ, β), respectively.[4][11][12][13]

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 (WISE), Hirundo 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.[14][15][16]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0853 and a diameter of 28.70 kilometers based on an absolute magnitude of 11.[11] The WISE-team also published two alternative mean-diameters of (Шаблон:Val) and (Шаблон:Val) with a corresponding albedos of (Шаблон:Val) and (Шаблон:Val).[4][11]

Notes

Шаблон:Notelist

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 2,2 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 Bus-DeMeo-taxonomy не указан текст
  8. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Warner-2001a не указан текст
  9. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Holliday-2001b не указан текст
  10. ↑ Ошибка цитирования Неверный тег <ref>; для сносок geneva-obs не указан текст
  11. ↑ 11,0 11,1 11,2 Ошибка цитирования Неверный тег <ref>; для сносок lcdb не указан текст
  12. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Hanus-2016a не указан текст
  13. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Durech-2016 не указан текст
  14. ↑ Ошибка цитирования Неверный тег <ref>; для сносок SIMPS не указан текст
  15. ↑ Ошибка цитирования Неверный тег <ref>; для сносок AKARI не указан текст
  16. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Mainzer-2016 не указан текст
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