Английская Википедия:986 Amelia

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986 Amelia (prov. designation: Шаблон:Mp or Шаблон:Mp) is a large background asteroid from the outer regions of the asteroid belt, approximately Шаблон:Convert in diameter. It was discovered on 19 October 1922, by Spanish astronomer Josep Comas i Solà at the Fabra Observatory in Barcelona. The L/D-type asteroid has a rotation period of 9.5 hours.Шаблон:Efn It was named after the discoverer's wife, Amelia Solà.

Orbit and classification

Amelia is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements. It orbits the Sun in the outer asteroid belt at a distance of 2.5–3.8 AU once every 5 years and 6 months (2,024 days; semi-major axis of 3.13 AU). Its orbit has an eccentricity of 0.20 and an inclination of 15° with respect to the ecliptic.

On 12 May 2015, Amelia was first observed as Шаблон:Mp (Шаблон:Mp) at the Simeiz Observatory on the Crimean peninsula. The body's observation arc begins at the Algiers Observatory in May 1926, more than 3 years after to its official discovery observation at the Fabra Observatory.

Naming

This minor planet was named after Amelia Solà, wife of the discoverer Josep Comas i Solà (1868–1937). The official Шаблон:MoMP was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (Шаблон:Small).

Physical characteristics

In both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), Amelia is a T-type asteroid, while in the SDSS-based taxonomy, the asteroid has been classified as an L-type.

Rotation period and poles

In October 2000, a rotational lightcurve of Amelia was obtained from photometric observations by American amateur astronomer Robert A. Koff at the Thornton Observatory Шаблон:Obscode in Colorado. Lightcurve analysis gave a well-defined rotation period of Шаблон:Val hours with a brightness amplitude of Шаблон:Val magnitude (Шаблон:Small).Шаблон:Efn

In December 2006, a concurring period determination of Шаблон:Convert was made by astronomers Raymond Poncy, Enric Forné, Hiromi Hamanowa, Hiroko Hamanowa and Hilari Pallarés (Шаблон:Small). In 2016, a modeled lightcurves using photometric data from various sources, rendered a concurring sidereal period of Шаблон:Val and two spin axes of (80.0°, 30.0°) and (282.0°, 30.0°) in ecliptic coordinates.

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the Infrared Astronomical Satellite IRAS, and the Japanese Akari satellite, Amelia 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. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1183 and a diameter of 50.94 kilometers based on an absolute magnitude of 9.4. An asteroid occultation, observed on 2 November 2006, gave a best-fit ellipse dimension of 51.0 × 51.0 kilometers. These timed observations are taken when the asteroid passes in front of a distant star. However the quality of the measurement is rated poorly.

External links

• Lightcurve Database Query (LCDB), at www.minorplanet.info
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Geneva Observatory, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• Шаблон:AstDys
• Шаблон:JPL small body