periodic comet
comet with a stable orbit that is shorter than 200 years
Comet Encke
periodic comet
Comet Holmes
comet
Halley's Comet
short-period comet visible from Earth every 75–76 years
Jupiter-family comet
family of periodic comets with an orbital period of less than 20 years and an inclination of up to 30 degrees
Encke-type comet
type of periodic comet with an orbit inside that of Jupiter
Halley-type comet
type of periodic comet with an orbital period between 20 and 200 years
active asteroid
bodies orbiting within the main asteroid belt which have shown cometary activity during part of their orbit