2024/07/23 by Ko Arimatsu, Fumi Yoshida, Tsutomu Hayamizu +31 · 1 voice · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #Astro and Planetary Science #Geological and Geochemical Analysis #Stellar, planetary, and galactic studies
paper · doi:10.1093/pasj/psae060
openalex publication_date 2024/07/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29
Abstract We present an analysis of a stellar occultation event caused by a near-Earth asteroid (98943) 2001 CC21, an upcoming flyby target in the Hayabusa2 extended mission, on 2023 March 5. To determine the asteroid’s shape from diffraction-affected light curves accurately, we developed a novel data-reduction technique named the Diffracted Occultation’s United Simulator for Highly Informative Transient Explorations (DOUSHITE). Using DOUSHITE-generated synthetic models, we derived constraints on (98943) 2001 CC21’s shadow shape from the single-chord occultation data. Our results suggest a significant elongation of the shadow with an axis ratio of b/a = 0.37± 0.09. This shape could be crucial for planning Hayabusa2’s high-speed flyby to optimise the limited imaging opportunities.