Английская Википедия:1533 Saimaa

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1533 Saimaa, provisional designation Шаблон:Mp, is a stony Eos asteroid from the outer regions of the asteroid belt, approximately 26 kilometers in diameter. It was discovered on 19 January 1939, by astronomer Yrjö Väisälä at the Iso-Heikkilä Observatory near Turku, Finland. The asteroid was named after lake Saimaa in Finland.

Orbit and classification

Saimaa is a member the Eos family (Шаблон:Small), the largest asteroid family of the outer main belt consisting of nearly 10,000 asteroids.Шаблон:Rp It orbits the Sun at a distance of 2.9–3.1 AU once every 5 years and 3 months (1,908 days). Its orbit has an eccentricity of 0.04 and an inclination of 11° with respect to the ecliptic. The asteroid was first identified as Шаблон:Mp at Uccle Observatory in March 1934. The body's observation arc begins with its identification as Шаблон:Mp at Heidelberg Observatory in August 1936, more than 2 years prior to its official discovery observation at Turku.

Physical characteristics

In the Tholen classification, Saimaa is a common stony S-type asteroid. The overall spectral type for members of the Eos family is that of a K-type.Шаблон:Rp

Rotation period

In September 1983, a first rotational lightcurve of Saimaa was obtained from photometric observations by American astronomer Richard Binzel at CTIO and McDonald Observatory. Lightcurve analysis gave a well-defined rotation period of 7.08 hours with a brightness variation of 0.18 magnitude (Шаблон:Small). In February 2007, another lightcurve obtained by French amateur astronomer René Roy gave a concurring period of 7.1181 hours and an amplitude of 0.26 magnitude (Шаблон:Small).

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Saimaa measures between 22.40 and 27.88 kilometers in diameter and its surface has an albedo between 0.107 and 0.165.

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1270 and a diameter of 26.16 kilometers based on an absolute magnitude of 10.77.

Naming

This minor planet was named after lake Saimaa in southeastern Finland. With an overall area of Шаблон:Convert, it is the country's largest lake and one of the largest lakes in Europe. The official Шаблон:MoMP was published by the Minor Planet Center on 20 February 1976 (Шаблон:Small).

External links

• 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