1521 Seinäjoki, provisional designation , is a Brasilia
asteroid
An asteroid is a minor planet of the inner Solar System. Sizes and shapes of asteroids vary significantly, ranging from 1-meter rocks to a dwarf planet almost 1000 km in diameter; they are rocky, metallic or icy bodies with no atmosphere.
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from the outer region of the asteroid belt, approximately 14 kilometers in diameter. It was discovered on 22 October 1938, by Finnish astronomer Yrjö Väisälä at the southwestern
Turku Observatory
Turku ( ; ; sv, Åbo, ) is a city and former capital on the southwest coast of Finland at the mouth of the Aura River, in the region of Finland Proper (''Varsinais-Suomi'') and the former Turku and Pori Province (''Turun ja Porin lääni''; 16 ...
, Finland. The asteroid was later named after the Finnish city of
Seinäjoki
Seinäjoki (; "Wall River"; la, Wegelia, formerly sv, Östermyra) is a city located in South Ostrobothnia, Finland; east of Vaasa, north of Tampere, west of Jyväskylä and southwest of Oulu. Seinäjoki originated around the Östermyra bru ...
asteroid family
An asteroid family is a population of asteroids that share similar proper orbital elements, such as semimajor axis, eccentricity, and orbital inclination. The members of the families are thought to be fragments of past asteroid collisions. An a ...