Английская Википедия:54 Alexandra
Шаблон:Short description Шаблон:Use dmy dates Шаблон:Infobox planet
Alexandra (minor planet designation: 54 Alexandra) is a carbonaceous asteroid from the intermediate asteroid belt, approximately 155 kilometers in diameter. It was discovered by German-French astronomer Hermann Goldschmidt on 10 September 1858, and named after the German explorer Alexander von Humboldt; it was the first asteroid to be named after a male.[1]
Description
On May 17, 2005, this asteroid occulted a faint star (magnitude 8.5) and the event was observed and timed in a number of locations within the U.S. and Mexico. As a result, a silhouette profile was produced, yielding a roughly oval cross-section with dimensions of 160 × 135 km (± 1 km).[2] The mass of the asteroid can be estimated based upon the mutually perturbing effects of other bodies, yielding an estimate of Шаблон:Val.[3]
Photometric observations of this asteroid during 1990–92 gave a light curve with a period of 18.14 ± 0.04 hours and a brightness variation of 0.10 in magnitude.[4] Alexandra has been studied by radar.[5] It was the namesake and largest member of the former Alexandra asteroid family; a dynamic group of C-type asteroids that share similar orbital elements. Other members included 70 Panopaea and 145 Adeona.[6] 145 Adeona was subsequently assigned to the Adeona family, with Alexandra and Panopaea being dropped.[7]
In Popular Culture
In the Swedish film Aniara (2018) it is mentioned that 54 Alexandra is the closest celestial body which the off-course and out-of-control spacecraft will approach before it leaves the Solar System.
References
External links
- Lightcurve plot of 54 Alexandra, Palmer Divide Observatory, B. D. Warner (2008)
- Asteroid Lightcurve Database (LCDB), query form (info Шаблон:Webarchive)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- Шаблон:AstDys
- Шаблон:JPL small body
Шаблон:Minor planets navigator Шаблон:Small Solar System bodies Шаблон:Authority control
- ↑ Ошибка цитирования Неверный тег
<ref>; для сносокSchmadel2003не указан текст - ↑ D.W. Dunham, "Upcoming Asteroid Occultations", Sky & Telescope, June, 2006, p. 63.
- ↑ Ошибка цитирования Неверный тег
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<ref>; для сносокWilliams1988не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокZappala1990не указан текст
- Английская Википедия
- Background asteroids
- Discoveries by Hermann Goldschmidt
- Named minor planets
- C-type asteroids (Tholen)
- C-type asteroids (SMASS)
- Astronomical objects discovered in 1858
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