Dynamical analyses on the transitivity from JFC and Centaur regions to NEAs with Tisserand parameters from 2 to 3

Abstract

We study the contribution of JFC (Jupiter family comet) and Centaur regions to the NEA (near Earth asteroid) population having Tisserand parameters for Jupiter between 2 and 3. We define a region for JFCs (aphelion distance (Q) >4.61au, perihelion distance (q) <4.95au, >1.3au) and we check the contributions of selected bodies (JFCs, Centaurs, Halley-type comets (HTCs), some elliptic comets, and some outer main belt asteroids) from various regions to the NEA region. Additionally, we integrated NEAs with Tisserand parameters for Jupiter (TJ) between 2 and 3 and their clones backward in time to see whether there was a strong dynamical path between those NEAs and the defined JFC region. As a result, 35.1% of the orbits from the defined JFC region turned out to be Earth-crossing orbits for forward integrations, while 66.7% of NEAs (2<TJ<3) reached the JFC region for backward integrations. Considering these probabilities, 304 orbits of today’s JFC regional bodies can contribute the Earth-crossing asteroids in 0.55Myr. Almost 254 NEA regional bodies look like they came from the defined region in a comparable time interval (0.80Myr).