Английская Википедия:869 Mellena

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869 Mellena (prov. designation: Шаблон:Mp or Шаблон:Mp) is a dark background asteroid from the central region of the asteroid belt. It was discovered on 9 May 1917, by astronomer Richard Schorr at the Bergedorf Observatory in Hamburg.[1] The carbonaceous C-type asteroid has a shorter than average rotation period of 6.5 hours and measures approximately Шаблон:Convert in diameter. It was named after Werner von Melle (1853–1937), mayor of Hamburg, who founded the discovering observatory.[2]

Orbit and classification

Mellena 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] It orbits the Sun in the central asteroid belt at a distance of 2.1–3.3 AU once every 4 years and 5 months (1,610 days; semi-major axis of 2.69 AU). Its orbit has an eccentricity of 0.22 and an inclination of 8° with respect to the ecliptic.[5]

Discovery

Mellena was discovered by German astronomer Richard Schorr at the Bergedorf Observatory in Hamburg on 9 May 1917.[1] On the following night, it was independently discovered by Max Wolf at Heidelberg Observatory on 10 May 1917.[2] The Minor Planet Center, however, only credits the first discoverer. Schorr only discovered one more asteroid, 1240 Centenaria, and was honored with the naming of Mars-crosser 1235 Schorria, discovered by Wolf. MellenaШаблон:'s observation arc begins at Algiers Observatory in Northern Africa on 26 March 1930, almost 13 years after its official discovery observation at Bergedorf.[1]

Naming

This minor planet was named after Werner von Melle (1853–1937), who was the mayor of Hamburg, Germany, in 1915 and during 1918–1919. He promoted the establishment of the University of Hamburg and founded the Bergedorf–Hamburg Observatory where this minor planet was discovered. The Шаблон:MoMP was also mentioned in The Names of the Minor Planets by Paul Herget in 1955 (Шаблон:Small).[2]

Physical characteristics

In both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2) as well as in the SDSS-based taxonomy, Mellena is a common, carbonaceous C-type asteroid.[4][6][7]

Rotation period

In May 2010, a rotational lightcurve of Mellena was obtained from photometric observations by Robert Stephens at the Santana Шаблон:Obscode and GMARS Шаблон:Obscode observatories in California. Lightcurve analysis gave a well-defined rotation period of Шаблон:Val hours with a brightness variation of Шаблон:Val magnitude (Шаблон:Small).[8] Subsequent observations were taken by Andrea Ferrero at the Bigmuskie Observatory Шаблон:Obscode in Mombercelli, Italy (Шаблон:Small),[9] and Larry Owings at the Barnes Ridge Observatory in California in June 2010 (Шаблон:Small),[10] as well as by Albino Carbognani Astronomical at the OAVdA Observatory Шаблон:Obscode in July 2010 (Шаблон:Small).[11] These observations gave a concurring period of (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val) hours with an amplitude of (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val) magnitude, respectively.[9]

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite, the Infrared Astronomical Satellite IRAS, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Mellena 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.[12][13][14] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0884 and a diameter of 18.64 kilometers based on an absolute magnitude of 11.9.[9] Alternative mean-diameter measurements published by the WISE team include (Шаблон:Val), (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val) with corresponding albedos of (Шаблон:Val), (Шаблон:Val), (Шаблон:Val) and (Шаблон:Val).[4][9]

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 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 Ошибка цитирования Неверный тег <ref>; для сносок Ferret не указан текст
  5. ↑ Ошибка цитирования Неверный тег <ref>; для сносок jpldata не указан текст
  6. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Lazzaro-2004 не указан текст
  7. ↑ Ошибка цитирования Неверный тег <ref>; для сносок SDSS-Taxonomy не указан текст
  8. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Stephens-2010e не указан текст
  9. ↑ 9,0 9,1 9,2 9,3 Ошибка цитирования Неверный тег <ref>; для сносок lcdb не указан текст
  10. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Owings-2011a не указан текст
  11. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Carbognani-2011a не указан текст
  12. ↑ Ошибка цитирования Неверный тег <ref>; для сносок AKARI не указан текст
  13. ↑ Ошибка цитирования Неверный тег <ref>; для сносок SIMPS не указан текст
  14. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Masiero-2014 не указан текст
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