Hsuan-Ting Lai (National Central University); Wing-Huen Ip (National Central University)
The TANGO consortium which is composed of NCU and NTHU is a partner to the ZTF project led by Caltech. It participates in the Twilight Survey of ZTF that was especially designed to detect asteroids with orbits inside Earth's orbit. These objects called atiras (orbits totally inside Earth's orbit) or vatiras (orbits totally inside Venus' orbit) are difficult to observe because of the strong sun glares. The Twilight Survey has proven to be a great success with the discoveries of several atiras, and the first vatira, 2020 VA2, on January 4, 2020. Upon the announcement of its discovery, a number of orbital studies have been performed (and published) to assess the orbital evolution of this km-sized asteroid. In the present work, we will consider the non-gravitational Yarkovsky effect on the long-term orbital variation of 2020 VA2. In addition, we will assess the Yarkovsky effect-driven orbital evolution of atiras and vatiras of smaller sizes.