1533 Saimaa

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1533 Saimaa, provisional designation Template: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.[1] The asteroid was named after lake Saimaa in Finland.[2]

Orbit and classification

Saimaa is a member the Eos family (606Script error: No such module "Check for unknown parameters".),[3] the largest asteroid family of the outer main belt consisting of nearly 10,000 asteroids.[4]Template: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.[5] The asteroid was first identified as Template:Mp at Uccle Observatory in March 1934. The body's observation arc begins with its identification as Template:Mp at Heidelberg Observatory in August 1936, more than 2 years prior to its official discovery observation at Turku.[1]

Physical characteristics

In the Tholen classification, Saimaa is a common stony S-type asteroid.[5][6] The overall spectral type for members of the Eos family is that of a K-type.[4]Template: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 (U=3Script error: No such module "Check for unknown parameters".).[7] 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 (U=3Script error: No such module "Check for unknown parameters".).[8]

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.[9][10][11]

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.[6]

Naming

This minor planet was named after lake Saimaa in southeastern Finland. With an overall area of Script error: No such module "convert"., it is the country's largest lake and one of the largest lakes in Europe.[2] The official Template:MoMP was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3929Script error: No such module "Check for unknown parameters".).[12]

References

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External links

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