Transition Objects

An asteroid on a short-period, comet-like orbit believed to be a dormant or extinct comet nucleus — the parent body of the sharp, brief Quadrantid meteor shower.

A near-Earth asteroid that brightens and sheds dust as it passes very close to the Sun — a 'rock comet' — and the parent body of the Geminid meteor shower, unusual for a shower whose source is an asteroid rather than a comet.

A large near-Earth object on a comet-like orbit long suspected to be a dormant comet; faint carbon-dioxide activity was detected in 2013, suggesting it is not fully extinct.

The prototype main-belt comet — an object on an ordinary asteroid-belt orbit that repeatedly develops a comet-like tail, carrying both an asteroid number and a comet designation.