Discovered by Y. Väisälä Minor planet category main-belt · (middle) Absolute magnitude 12.4 Discoverer Yrjö Väisälä Asteroid group Asteroid belt | Discovery date 18 September 1939 Alternative names 1939 SC · 1930 SE Discovered 18 September 1939 Orbits Sun Discovery site Iso-Heikkilä Observatory | |
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1525 Savonlinna, provisional designation 1939 SC, is an asteroid from the middle region of the asteroid belt, approximately 12 kilometers in diameter. It was discovered on 18 September 1939, by Finnish astronomer Yrjö Väisälä at the Turku Observatory in southwestern Finland.
Savonlinna orbits the Sun at a distance of 2.0–3.4 AU once every 4 years and 5 months (1,619 days). Its orbit has an eccentricity of 0.26 and an inclination of 6° with respect to the ecliptic. It was first identified as 1930 SE at Simeiz Observatory, extending the body's arc length by 9 years prior to its official discovery observation at Turku.
In October and December 2010, two rotational light-curves of Savonlinna were obtained by Gordon Gartrelle at UND and the Palomar Transient Factory in California. Light-curve analysis gave a divergent rotation period of 14.634 and 22.8406 hours with a brightness variation of 0.52 and 0.50 magnitude, respectively (U=2/2).
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Savonlinna measures between 11.73 and 12.23 kilometers in diameter and its surface has an albedo between 0.045 and 0.130. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.084 and a diameter of 12.06 kilometers based on an absolute magnitude of 12.9. It also classifies the body as a S-type asteroid, despite its derived albedo.
This minor planet was named for the eastern Finnish town Savonlinna, located in the heart of the Saimaa lake region. Naming citation was published before November 1977 (M.P.C. 3929).