Ac unity venus11/27/2023 ![]() ![]() ![]() Each Twilight Survey session lasts for 20–25 min. The scheduler produces a nearly connecting 10 field pattern that covers 470 square degrees of sky during each observing session at elevations down to ∼20 deg. The Twilight Survey alternates between evening and morning twilight providing a total of 90 observing sessions, on 47 mornings and on 43 evenings between 2019 September January 30. The Twilight Survey is scheduled within the framework of the ZTF scheduler (Bellm et al. An expanded version of the Twilight Survey was executed between 2019 September January 30, observing during astronomical twilight on each clear night. A preliminary version of the Twilight Survey ran in late 2018 and the first half of 2019 (Ye et al. A portion of the time for the ZTF survey is designed to observe portions of the sky as close as possible to the Sun during evening and morning twilight called the ‘Twilight Survey’ (Bolin et al. The Zwicky Transient Facility (ZTF) mounted on the Palomar Observatory Samuel Oschin Schmidt Telescope is an all-sky survey designed to detect transients in the Northern hemisphere (Bellm et al. This postulated IVA population has been provisionally referred to as Vatiras, 1 by analogy with the Atiras (Greenstreet et al. This is in part due to the difficulty of surveying this region of the Solar system within a small angular distance of the Sun with ground-based telescopes (Masi 2003). However, IVAs have not been observed despite previous searches for objects interior to the orbit of the Earth (Whiteley & Tholen 1998 Zavodny et al. ![]() 2018) consists of Atira asteroids located between the orbit of the Earth and Venus, and inner-Venus asteroids (IVAs) located entirely within the orbit of Venus. Dynamical models predict that a small fraction of the near-Earth asteroid (NEA) population (Bottke et al. Minor planets, asteroids: general 1 INTRODUCTIONĪlmost all of the ∼1 million known asteroids are located on orbits exterior to Earth’s orbit compared to just a fraction of a per cent that have orbits located entirely inside Earth’s orbit (Binzel, Reddy & Dunn 2015). ![]()
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