Please note that the content of this book primarily consists of articles
available from Wikipedia or other free sources online. 4155 Watanabe
(1987 UB1) is a main-belt asteroid discovered on October 25, 1987 by
Seiji Ueda and Hiroshi Kaneda at Kushiro. 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.
