Diffraction modelling of a 2023 March 5 stellar occultation by subkilometer-sized asteroid (98943) 2001 CC21

IF 2.2 4区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Publications of the Astronomical Society of Japan Pub Date : 2024-07-23 DOI:10.1093/pasj/psae060

Ko Arimatsu, Fumi Yoshida, Tsutomu Hayamizu, Miyoshi Ida, George L Hashimoto, Takashi Abe, Hiroshi Akitaya, Akari Aratani, Hidekazu Fukuda, Yasuhide Fujita, Takao Fujiwara, Toshihiro Horikawa, Tamio Iihoshi, Kazuyoshi Imamura, Ryo Imazawa, Hisashi Kasebe, Ryosuke Kawasaki, Hiroshi Kishimoto, Kazuhisa Mishima, Machiko Miyachi, Masanori Mizutani, Maya Nakajima, Hiroyoshi Nakatani, Kazuhiko Okamura, Misaki Okanobu, Masataka Okuda, Yuji Suzuki, Naoto Tatsumi, Masafumi Uno, Hidehito Yamamura, Mikoto Yasue, Hideki Yoshihara, Masatoshi Hirabayashi, Makoto Yoshikawa

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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 $b/a = 0.37\pm 0.09$. This shape could be crucial for planning Hayabusa2’s high-speed flyby to optimise the limited imaging opportunities.

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亚千米级小行星（98943）2001 CC21 2023 年 3 月 5 日恒星掩星的衍射模型

我们介绍了对一颗近地小行星（98943）2001 CC21引起的恒星掩星事件的分析，该小行星是隼鸟2号（Hayabusa2）延伸任务中即将于2023年3月5日飞越的目标。为了从受衍射影响的光曲线中准确地确定小行星的形状，我们开发了一种新颖的数据还原技术，名为 "衍射掩星高信息瞬变探索联合模拟器"（DOUSHITE）。利用 DOUSHITE 生成的合成模型，我们从单弦掩星数据中得出了 (98943) 2001 CC21 的阴影形状约束条件。我们的结果表明影子有明显的拉长，轴比为$b/a = 0.37\pm 0.09$。这种形状对于规划隼鸟2号的高速飞越以优化有限的成像机会至关重要。

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来源期刊

Publications of the Astronomical Society of Japan 地学天文-天文与天体物理

CiteScore

4.10

自引率

13.00%

发文量

审稿时长

4-8 weeks

期刊介绍： Publications of the Astronomical Society of Japan (PASJ) publishes the results of original research in all aspects of astronomy, astrophysics, and fields closely related to them.