Chiron Comet

Chiron was observed to display comet-like characteristics as it neared the Sun. Turned out Chiron was a very large comet, with a nucleus 112 miles in diameter, more than 10x the size of Halley's comet.
 1989 Chiron Comet

Chiron was observed to display comet-like characteristics as it neared the Sun. Turned out Chiron was a very large comet, with a nucleus 112 miles in diameter, more than 10x the size of Halley's comet.