Английская Википедия:803 Picka

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803 Picka (prov. designation: Шаблон:Mp or Шаблон:Mp) is a large and dark background asteroid from the outer regions of the asteroid belt. It was discovered on 21 March 1915, by Austrian astronomer Johann Palisa at the Vienna Observatory.[1] The carbonaceous D-type asteroid has a rotation period of 5.1 hours and measures approximately Шаблон:Convert in diameter. It was named after Czech physician Friedrich Pick (1867–1921).[2]

Orbit and classification

Picka 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 asteroid belt at a distance of 3.0–3.4 AU once every 5 years and 9 months (2,094 days; semi-major axis of 3.2 AU). Its orbit has an eccentricity of 0.07 and an inclination of 9° with respect to the ecliptic.[6] On 8 July 1899, the asteroid was first observed as Шаблон:Mp at the Boyden Station Шаблон:Obscode of the Harvard Observatory in Arequipa, Peru. The body's observation arc begins with its official discovery observation by Johann Palisa at Vienna Observatory on 21 March 1915.[1]

Naming

This minor planet was named after Czech physician Friedrich Pick (1867–1921) from Prague , who was the first physician to introduce endoscopic methods in medicine. According to the 1917 edition of the astronomical calendar in German "Astronomischer Kalender für 1917", the asteroid was named by friends of the discoverer Johann Palisa. The Шаблон:MoMP was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (Шаблон:Small).[2]

Physical characteristics

In the SDSS-based taxonomy, Picka is a dark D-type asteroid.[7] In the 1995 SMASS-I survey by Xu, it is classified as an uncommon T-type with some similarities to a D-type (TD).[4] The D-types asteroids are common in the outer main-belt and are very abundant among the Jupiter trojan population.

Rotation period

Файл:803Picka (Lightcurve Inversion).png
Lightcurve based 3D-model of Picka

In April 2007, a rotational lightcurve of Picka was obtained from photometric observations by French amateur astronomer Pierre Antonini. Lightcurve analysis gave a well-defined rotation period of Шаблон:Val hours with a high brightness variation of Шаблон:Val magnitude, indicative of an elongated shape (Шаблон:Small).[8] Alternative and lower-rated photometric observations were made by Jean-Gabriel Bosch in February 2006, and again by Pierre Antonini in November 2010, which gave a period of Шаблон:Val and Шаблон:Val hours with an amplitude of Шаблон:Val and Шаблон:Val magnitude (Шаблон:Small).[8]

Lightcurve inversion also modeled the body's shape and poles. In 2013, modelling by an international study using photometric data from the US Naval Observatory, the Uppsala Asteroid Photometric Catalogue, the Palomar Transient Factory and the Catalina Sky Survey gave a concurring sidereal period of Шаблон:Val hours and two spin axes at (218.0°, 34.0°) and (53.0°, 41.0°) in ecliptic coordinates (λ, β). The body's very elongated shape had already been indicated by the relatively high brightness variation measured during the direct photometric observations.[4][9]

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), Picka 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.[10][11][12] The Collaborative Asteroid Lightcurve Link derives an albedo of Шаблон:Val and a diameter of 46.72 kilometers based on an absolute magnitude of 9.4.[13] On 13 May 2015, an asteroid occultation of Picka gave a best-fit ellipse dimension of (Шаблон:Val), which is similar to that obtained by the Japanese Akari satellite. These timed observations are taken when the asteroid passes in front of a distant star. This observation still has received a low quality rating.[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. ↑ Ошибка цитирования Неверный тег <ref>; для сносок jpldata не указан текст
  7. ↑ Ошибка цитирования Неверный тег <ref>; для сносок SDSS-Taxonomy не указан текст
  8. ↑ 8,0 8,1 Ошибка цитирования Неверный тег <ref>; для сносок geneva-obs не указан текст
  9. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Hanus-2013a не указан текст
  10. ↑ Ошибка цитирования Неверный тег <ref>; для сносок SIMPS не указан текст
  11. ↑ Ошибка цитирования Неверный тег <ref>; для сносок AKARI не указан текст
  12. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Mainzer-2016 не указан текст
  13. ↑ Ошибка цитирования Неверный тег <ref>; для сносок lcdb не указан текст
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