Chiron is a minor body discovered by Charles Kowal on photographic plates made on 18 and 19 October 1977. From the beginning astronomers had doubts about Chiron's nature: is it an asteroid, or is it a comet? In 1988 a tail was observed, indicating that this celestial body is a comet. The astronomers' eyes are pointed toward Chiron. It goes through its perihelion on 1996 February 14. This happens only every 51 years.
The NASA NSSDC has an archive of information and photos about this object.