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Toshifukushima (1992 UN4) is a main-belt asteroid discovered on October
26, 1992 by K. Endate and K. Watanabe at Kitami. Asteroids (from Greek
¿¿¿¿¿ 'star' and ¿¿¿¿¿ 'like, in form') are a class of small Solar
System bodies in orbit around the Sun. They have also been called
planetoids, especially the larger ones. These terms have historically
been applied to any astronomical object orbiting the Sun that did not
show the disk of a planet and was not observed to have the
characteristics of an active comet, but as small objects in the outer
Solar System were discovered, their volatile-based surfaces were found
to more closely resemble comets, and so were often distinguished from
traditional asteroids.
