39P / Oterma is a currently inactive periodic comet in the Solar System with an orbital period of nearly 20 years. The size of its nucleus is not known. Discovery · Orbit · Orbital development · References.
Comet Oterma. Introduction. This simulation shows Comet 39P / Oterma, which has been calculated to have several close encounters with Jupiter and Saturn.
The work of J Ross describes the Comet 39P / Oterma orbit as being a comet which changed its orbit quite dramatically after a close encounter.