Английская Википедия:1212 Francette

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Шаблон:Infobox planet

1212 Francette, provisional designation Шаблон:Mp, is a dark Hildian asteroid from the outermost regions of the asteroid belt, approximately 82 kilometers in diameter. It was discovered on 3 December 1931, by French astronomer Louis Boyer at the Algiers Observatory in Algeria, North Africa, who named it after his wife Francette Boyer.[1][2]

Orbit and classification

Francette is a member of the small Hilda family (Шаблон:Small),[3] an asteroid family within the dynamical Hilda group,[4] that stays in an orbital resonance with the gas giant Jupiter. It orbits the Sun in the outermost asteroid belt at a distance of 3.2–4.7 AU once every 7 years and 10 months (2,872 days; semi-major axis of 3.95 AU). Its orbit has an eccentricity of 0.19 and an inclination of 8° with respect to the ecliptic.[5]

The asteroid was first observed as Шаблон:Mp at Simeiz Observatory in May 1918. The body's observation arc begins at Algiers with its official discovery observation.[2]

Physical characteristics

In the Tholen classification, Francette is a primitive P-type asteroid.[5] In the SMASS classification it is an X-type asteroid.[5][4] The Wide-field Infrared Survey Explorer (WISE) also characterizes Francette as a dark P-type,[6] while the overall spectral type for members of the Hilda family is typically that of a carbonaceous C-type.[7]Шаблон:Rp

Rotation period

In July 2016, a rotational lightcurve of Francette was obtained from photometric observations by American astronomers Brian Warner, Robert Stephens and Dan Coley at the Center for Solar System Studies (Шаблон:Small) in California. Lightcurve analysis gave a rotation period of 22.433 hours with a brightness variation of 0.13 magnitude (Шаблон:Small), superseding a period of 16 hours, previously measured in the 1970s.[8][9]Шаблон: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 WISE telescope, Francette measures between 76.395 and 85.81 kilometers in diameter and its surface has an albedo between 0.037 and 0.046.[10][11][12][6]

The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0400 and a diameter of 82.13 kilometers based on an absolute magnitude of 9.54.[4][11]

Naming

This minor planet was named by the discoverer after his wife, Francette Boyer. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (Шаблон:Small).[1]

Notes

Шаблон:Notelist

References

Шаблон:Reflist

External links

Шаблон:Use dmy dates Шаблон:Minor planets navigator Шаблон:Small Solar System bodies

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  1. ↑ 1,0 1,1 Ошибка цитирования Неверный тег <ref>; для сносок springer не указан текст
  2. ↑ 2,0 2,1 Ошибка цитирования Неверный тег <ref>; для сносок MPC-object не указан текст
  3. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Ferret не указан текст
  4. ↑ 4,0 4,1 4,2 Ошибка цитирования Неверный тег <ref>; для сносок lcdb не указан текст
  5. ↑ 5,0 5,1 5,2 Ошибка цитирования Неверный тег <ref>; для сносок jpldata не указан текст
  6. ↑ 6,0 6,1 Ошибка цитирования Неверный тег <ref>; для сносок WISE не указан текст
  7. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Nesvorny-2014 не указан текст
  8. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Taylor-1976 не указан текст
  9. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Warner-2017a не указан текст
  10. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Grav-2012a не указан текст
  11. ↑ 11,0 11,1 Ошибка цитирования Неверный тег <ref>; для сносок SIMPS не указан текст
  12. ↑ Ошибка цитирования Неверный тег <ref>; для сносок AKARI не указан текст
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