Английская Википедия:845 Naëma

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845 Naëma (prov. designation: Шаблон:Mp or Шаблон:Mp) is a large asteroid and the parent body of the Naëma family located in the outer regions of the asteroid belt. It was discovered on 16 November 1916, by astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory in southwest Germany.[1] The carbonaceous C-type asteroid has a rotation period of 20.9 hours and measures approximately Шаблон:Convert in diameter on average, as it is likely elongated in shape. Any reference of the asteroid's name to a person is unknown.[2]

Orbit and classification

Naëma is the parent body of the Naëma family (Шаблон:Small), a smaller family of little more than 300 carbonaceous asteroids, when applying the hierarchical clustering method.[3]Шаблон:Rp This asteroid family is widely recognized by a number of Solar System dynamicists including Zappalà,[4] Nesvorný,[5] as well as Milani and Knežević (AstDyS)[6] The family was first detected by Vincenzo Zappalà in 1994/95.[7]

Naëma orbits the Sun in the outer asteroid belt at a distance of 2.7–3.1 AU once every 5.04 years (1,840 days; semi-major axis of 2.94 AU). Its orbit has an eccentricity of 0.07 and an inclination of 13° with respect to the ecliptic.[8] The body's observation arc begins as Шаблон:Mp (Шаблон:Mp) with its official discovery observation at Heidelberg Observatory on 16 November 1916.[1]

Naming

Naëma is a German variant of the biblical name Naomi.[9] However, any reference of this minor planetШаблон:'s name to a person or occurrence is unknown.[2]

Unknown meaning

Among the many thousands of named minor planets, Naëma is one of 120 asteroids for which no official naming citation has been published. All of these asteroids have low numbers, the first being Шаблон:Mp. The last asteroid with a name of unknown meaning is Шаблон:Mp. They were discovered between 1876 and the 1930s, predominantly by astronomers Auguste Charlois, Johann Palisa, Max Wolf and Karl Reinmuth.[10]

Physical characteristics

In the Bus–Binzel SMASS classification, Naëma is a common, carbonaceous C-type asteroid,[11] which is the overall spectral type of the Naëma family.[3]Шаблон:Rp

Rotation period

In September 2006, a rotational lightcurve of Naëma was obtained from photometric observations by Collin Bembrick at the Mount Tarana Observatory Шаблон:Obscode, Australia, in collaboration with Bill Allen and Greg Bolt. Lightcurve analysis gave a relatively long rotation period of Шаблон:Val hours with a brightness variation of Шаблон:Val magnitude (Шаблон:Small).[12] In December 2017, French amateur astronomer René Roy determined a lower-rated, tentative period of Шаблон:Val hours with an amplitude of Шаблон:Val magnitude (Шаблон:Small).[13]

Diameter and albedo

According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), the Infrared Astronomical Satellite IRAS, and the Japanese Akari satellite, Naëma 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][17] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0503 and a diameter of 54.05 kilometers based on an absolute magnitude of 10.2.[18] Alternative mean-diameter measurements published by the WISE team include (Шаблон:Val), (Шаблон:Val), (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val) with corresponding albedos of (Шаблон:Val), (Шаблон:Val), (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val).[11][18]

Several asteroid occultations of Naëma have been observed between 2002 and 2010. The best-rated one from 10 April 2010, gave a best-fit ellipse dimension of (Шаблон:Val).[11] These timed observations are taken when the asteroid passes in front of a distant star.

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 Ошибка цитирования Неверный тег <ref>; для сносок Nesvorny-2014 не указан текст
  4. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Zappala-family не указан текст
  5. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Ferret-family не указан текст
  6. ↑ Ошибка цитирования Неверный тег <ref>; для сносок AstDys-object не указан текст
  7. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Zappala-1995 не указан текст
  8. ↑ Ошибка цитирования Неверный тег <ref>; для сносок jpldata не указан текст
  9. ↑ Nicodemus Frischlin (1606) Methodus declamandi posthuma, in laudatione, thesi de laudibus mulierum demonstrata, p. 165-166
  10. ↑ Ошибка цитирования Неверный тег <ref>; для сносок DOMPN-unknown не указан текст
  11. ↑ 11,0 11,1 11,2 Ошибка цитирования Неверный тег <ref>; для сносок Ferret не указан текст
  12. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Bembrick-2008a не указан текст
  13. ↑ Ошибка цитирования Неверный тег <ref>; для сносок geneva-obs не указан текст
  14. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Mainzer-2016 не указан текст
  15. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Masiero-2014 не указан текст
  16. ↑ Ошибка цитирования Неверный тег <ref>; для сносок SIMPS не указан текст
  17. ↑ Ошибка цитирования Неверный тег <ref>; для сносок AKARI не указан текст
  18. ↑ 18,0 18,1 Ошибка цитирования Неверный тег <ref>; для сносок lcdb не указан текст
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