Английская Википедия:1551 Argelander

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1551 Argelander, provisional designation Шаблон:Mp, is a background asteroid from the inner regions of the asteroid belt, approximately Шаблон:Convert in diameter. It was discovered on 24 February 1938, by Finnish astronomer Yrjö Väisälä at the Turku Observatory in southwest Finland. The likely S-type asteroid has a rotation period of 4.1 hours. It was named after German astronomer Friedrich Argelander.

Orbit and classification

Argelander is a non-family asteroid from the main belt's background population. It orbits the Sun in the inner main-belt at a distance of 2.2–2.6 AU once every 3 years and 9 months (1,353 days; semi-major axis of 2.39 AU). Its orbit has an eccentricity of 0.07 and an inclination of 4° with respect to the ecliptic. The body's observation arc begins with its first observation as Шаблон:Mp at Heidelberg Observatory in January 1930, or 8 years prior to its official discovery observation at Turku.

Naming

This minor planet was named after Friedrich Wilhelm Argelander (1799–1875), author of the famous Bonner Durchmusterung and 19th-century head of the ancient observatory at Turku and Bonn Шаблон:Obscode. The official Шаблон:MoMP was published by the Minor Planet Center on 30 January 1964 (Шаблон:Small). The lunar crater Argelander is also named after him.

Physical characteristics

Argelander is an assumed S-type asteroid.

Rotation period and poles

In August 2017, a rotational lightcurve of Argelander was obtained from photometric observations at the Chilean Cerro Tololo Inter-American Observatory using the SARA South Telescope. Lightcurve analysis gave a rotation period of Шаблон:Val hours and a brightness variation of 0.48 magnitude (Шаблон:Small). In January 2012, astronomers at the Palomar Transient Factory had also determined a period of Шаблон:Val with an amplitude of 0.41 magnitude (Шаблон:Small).

A modeled lightcurve using photometric data from the Lowell Photometric Database was published in 2016. It gave a concurring period of Шаблон:Val hours, as well as two spin axes at (3.0°, −81.0°) and (183.0°, −72.0°) in ecliptic coordinates (λ, β).

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Argelander measures between 9.2 and 11.0 kilometers in diameter and its surface has an albedo between 0.19 and 0.30. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroid of 0.20 and calculates a diameter of 9.60 kilometers based on an absolute magnitude of 12.45.

External links

• Asteroid Lightcurve Database (LCDB), query form (info Шаблон:Webarchive)
• Dictionary of Minor Planet Names, Google books
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• Шаблон:AstDys
• Шаблон:JPL small body