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Near-Earth asteroid (469219) Kamo'oalewa (aka 2016 HO3) is an Earthco-orbital and a potential space mission target. Its short-term dynamics ischaracterized by a periodic switching between quasi-satellite and horseshoeconfigurations. Due to its small diameter of only about 36 meters, theYarkovsky effect may play a significant role in the long-term dynamics. In thiswork, we addressed this issue by studying the changes in the long-term motionof Kamo'oalewa caused by the Yarkovsky effect. We used an estimation of themagnitude of the Yarkovsky effect assuming different surface compositions andintroduced the semi-major axis drift by propagating orbits of test particlesrepresenting the clones of the nominal orbit. Our simulations showed that theYarkovsky effect may cause Kamo'oalewa to exit from the Earth co-orbital regiona bit faster when compared to a purely gravitational model. Nevertheless, itstill could remain an Earth companion for at least 0.5 My in the future. Ourresults imply that Kamo'oalewa is the most stable Earth's co-orbital objectknown so far, not only from a short-term perspective but also on long timescales.

The role of the Yarkovsky effect in the long-term dynamics of asteroid (469219) Kamo'oalewa