450P’s orbital history is visualized with this diagram. The Centaur had a close approach to Saturn in 1992 that changed its long-term trans-Saturnian orbit (black curve) into one with a perihelion closer to Jupiter (blue). 450P is predicted to have a close encounter with Jupiter in 2026 July, which will stabilize its orbit for the next ∼200 yr (gold/orange). These orbital changes increasingly subject the Centaur’s nucleus to more insolation, which may drive volatile release. In Section 4.5 we propose a model that explains 450P’s activity at each numbered point in this diagram. The green diamond indicates the prediscovery data, the orange hexagons are for data from the literature, and the cyan circles are from this work.