Английская Википедия:283 Emma

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283 Emma is a large asteroid of the asteroid belt and the namesake of the Emma family. It was discovered by Auguste Charlois on 8 February 1889, in Nice, France. The reason for its name is unknown.[1]

Measurements made with the IRAS observatory give a diameter of 145.70 ± 5.89 km and a geometric albedo of 0.03 ± 0.01. By comparison, the MIPS photometer on the Spitzer Space Telescope gives a diameter of 145.44 ± 7.72 km and a geometric albedo of 0.03 ± 0.01. When the asteroid was observed occulting a star, the results showed a diameter of 148.00 ± 16.26 km.[2]

Satellite

A companion for 283 Emma was detected on 14 July 2003 by W. J. Merline et al. using the Keck II telescope and is designated S/2003 (283) 1. The announcement is contained in the International Astronomical Union Circular (IAUC) 8165.[3] The satellite orbits at a semi-major axis of about 581 km with an eccentricity of 0.12.[4] Emma has a Hill sphere with a radius of about 28,000 km.[4]

References

Шаблон:Reflist

External links

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  1. Шаблон:Cite book
  2. Ошибка цитирования Неверный тег <ref>; для сносок 2012arXiv1204 не указан текст
  3. S/2003 (283) 1 (Circular No. 8165)
  4. 4,0 4,1 Ошибка цитирования Неверный тег <ref>; для сносок Marchis2008 не указан текст