Английская Википедия:9965 GNU

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Шаблон:Use dmy dates Шаблон:Infobox planet

9965 GNU, provisional designation Шаблон:Mp, is a background asteroid from the inner regions of the asteroid belt, approximately Шаблон:Convert in diameter. It was discovered on 5 March 1992, by astronomer of the Spacewatch program at the Kitt Peak National Observatory in Arizona, United States.[1] The uncertain D-type asteroid has a long rotation period of 39.7 hours.[2] It was named for the free-software GNU Project.[1]

Orbit and classification

GNU is a non-family asteroid from the main belt's background population.[3]

It orbits the Sun in the inner asteroid belt at a distance of 2.0–2.8 AU once every 3 years and 9 months (1,373 days; semi-major axis of 2.42 AU). Its orbit has an eccentricity of 0.17 and an inclination of 12° with respect to the ecliptic.[4] The body's observation arc begins with its first observation as Шаблон:Mp at La Silla Observatory in January 1988, or 4 years prior to its official discovery observation at Kitt Peak.[1]

Physical characteristics

GNU has been characterized as a dark D-type asteroid by Pan-STARRSШаблон:' survey and in the SDSS-based taxonomy.[5][6] It is also an assumed S-type asteroid, the most common type in the inner asteroid belt.[2]

Rotation period

In September and October 2012, two rotational lightcurves of GNU were obtained from photometric observations by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 39.720 and 39.745 hours, with a brightness amplitude of 0.36 and 0.42 magnitude in the R- and S-band, respectively (Шаблон:Small).[7] While not being a slow rotator, GNUШаблон:' period is significantly longer than the average spin rate of 2 to 20 hours, seen among the majority of asteroids.

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, GNU measures between 2.07 and 6.293 kilometers in diameter and its surface has an albedo between 0.102 and 0.53.[8][9][10][11] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroid of 0.20 and calculates a diameter of 4.10 kilometers based on an absolute magnitude of 14.3.[2]

Naming

This minor planet was named for the free-software GNU Project, created by Richard Stallman 1984. GNU is the recursive acronym for "GNU is not Unix". The collaborative projects enables programmers to trade and improve upon free software.[1] The official naming citation was published by the Minor Planet Center on 11 November 2000 (Шаблон:Small).[12]

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 1,2 1,3 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 lcdb не указан текст
  3. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Ferret не указан текст
  4. ↑ Ошибка цитирования Неверный тег <ref>; для сносок jpldata не указан текст
  5. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Veres-2015 не указан текст
  6. ↑ Ошибка цитирования Неверный тег <ref>; для сносок SDSS-Taxonomy не указан текст
  7. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Waszczak-2015 не указан текст
  8. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Nugent-2016 не указан текст
  9. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Masiero-2012 не указан текст
  10. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Masiero-2011 не указан текст
  11. ↑ Ошибка цитирования Неверный тег <ref>; для сносок WISE не указан текст
  12. ↑ Ошибка цитирования Неверный тег <ref>; для сносок MPC-Circulars-Archive не указан текст
Источник — http://wikihandbk.com/ruwiki/index.php?title=Английская_Википедия:9965_GNU&oldid=12871194