The orbital evolution of Atira asteroids

ABSTRACT Asteroids having perihelion distance q < 1.3 AU are classified as near-Earth objects (NEOs), which divided into different sub-groups: Vatira-class, Atira-class, Aten-class, Apollo-class, and Amor-class. 2020 AV2, the first Vatira (Orbiting totally inside Venus’ orbit) was discovered by Twilight project of Zwicky Transient Facility (ZTF) on January 4. Upon discovery a couple orbital studies short-term evolution AV2 have been performed published (e.g. de la Fuente Marcos & 2020; Greenstreet 2020). In this work, we an assessment long-term known Atiras under Yarkovsky effect using Mercury6 N-body code. We considered not only planetary gravitational perturbation but also non-gravitational effect. Our calculation shows that NEOs generally two dynamical populations, one short-lived other long-lived. From our calculation, transfer probabilities Atira-class asteroids to Vatira-class for transition ∼13.1 ± 0.400, ∼13.05 0.005, ∼13.25 0.450 ${{\ \rm per\ cent}}$ values force (i.e. obliquity 0, 90, 180 deg), respectively. It suggests radiation may play some role in asteroid population. Finally, statistical study implicates there should be 8.14 0.133 1.05 0.075 Vatira-asteroids S-type taxonomy.