1. Diffraction modelling of a 2023 March 5 stellar occultation by subkilometer-sized asteroid (98943) 2001 CC21
- Author
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Arimatsu, Ko, Yoshida, Fumi, Hayamizu, Tsutomu, Ida, Miyoshi, Hashimoto, George L, Abe, Takashi, Akitaya, Hiroshi, Aratani, Akari, Fukuda, Hidekazu, Fujita, Yasuhide, Fujiwara, Takao, Horikawa, Toshihiro, Iihoshi, Tamio, Imamura, Kazuyoshi, Imazawa, Ryo, Kasebe, Hisashi, Kawasaki, Ryosuke, Kishimoto, Hiroshi, Mishima, Kazuhisa, Miyachi, Machiko, Mizutani, Masanori, Nakajima, Maya, Nakatani, Hiroyoshi, Okamura, Kazuhiko, Okanobu, Misaki, Okuda, Masataka, Suzuki, Yuji, Tatsumi, Naoto, Uno, Masafumi, Yamamura, Hidehito, Yasue, Mikoto, Yoshihara, Hideki, Hirabayashi, Masatoshi, and Yoshikawa, Makoto
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Astrophysics - Earth and Planetary Astrophysics - 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 March 5, 2023. To accurately determine the asteroid's shape from diffraction-affected light curves, 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 $b/a = 0.37\pm0.09$. This shape can be crucial for planning Hayabusa2's high-speed flyby to optimise the limited imaging opportunities., Comment: 10 pages, 9 figures, PASJ accepted
- Published
- 2024
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