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Most co-orbital objects in the Solar system are thought to followtadpole-type orbits, behaving as Trojans. However, most of Earth's identifiedco-orbitals are moving along horseshoe-type orbits. The current tally of minorbodies considered to be Earth co-orbitals amounts to 18; of them, 12 arehorseshoes, five are quasi-satellites, and one is a Trojan. The semimajor axisvalues of all these bodies librate between $0.983$ au and $1.017$ au. In thiswork, we have studied the dynamical behaviour of objects following orbits withsemimajor axis within this range that may be in a 1:1 mean-motion resonancewith Earth. Our results show that asteroids 2016 CO$_{246}$, 2017 SL$_{16}$,and 2017 XQ$_{60}$ are moving along asymmetrical horseshoe-type orbits; theasteroid 2018 PN$_{22}$ follows a nearly symmetric or regular horseshoe-typeorbit. Asteroids 2016 CO$_{246}$, 2017 SL$_{16}$, and 2017 XQ$_{60}$ can remainin the horseshoe co-orbital state for about $900$ yr, $3300$ yr and $2700$ yr,respectively. Asteroid 2018 PN$_{22}$ has a more chaotic dynamical behaviour;it may not stay in a horseshoe co-orbital state for more than 200 yr. Thehorseshoe libration periods of 2016 CO$_{246}$, 2017 SL$_{16}$, 2017 XQ$_{60}$,and 2018 PN$_{22}$ are 280, 255, 411, and 125 yr, respectively.

Horseshoe Co-orbitals of Earth: Current Population and New Candidates