Updated inflight calibration of Hayabusa2's optical navigation camera (ONC) for scientific observations during the cruise phase

Eri Tatsumi, Toru Kouyama, Hidehiko Suzuki, Manabu Yamada, Naoya Sakatani, Shingo Kameda, Yasuhiro Yokota, Rie Honda, Tomokatsu Morota, Keiichi Moroi, Naoya Tanabe, Hiroaki Kamiyoshihara, Marika Ishida, Kazuo Yoshioka, Hiroyuki Sato, Chikatoshi Honda, Masahiko Hayakawa, Kohei Kitazato, Hirotaka Sawada, Seiji Sugita

doi:10.48550/arxiv.1810.11065

The Optical Navigation Camera (ONC-T, ONC-W1, ONC-W2) onboard Hayabusa2 are also being used for scientific observations of the mission target, C-complex asteroid 162173 Ryugu. Science observations and analyses require rigorous instrument calibration. In order to meet this requirement, we have conducted extensive inflight observations during the 3.5 years of cruise after the launch of Hayabusa2 on 3 December 2014. In addition to the first inflight calibrations by Suzuki et al. (2018), we conducted an additional series of calibrations, including read-out smear, electronic-interference noise, bias, dark current, hot pixels, sensitivity, linearity, flat-field, and stray light measurements for the ONC. Moreover, the calibrations, especially flat-fields and sensitivities, of ONC-W1 and -W2 are updated for the analysis of the low-altitude (i.e., high-resolution) observations, such as the gravity measurement, touchdowns, and the descents for MASCOT and MINERVA-II payload releases. The radiometric calibration for ONC-T is also updated in this study based on star and Moon observations. Our updated inflight sensitivity measurements suggest the accuracy of the absolute radiometric calibration contains less than 1.8% error for the ul-, b-, v-, Na-, w-, and x-bands based on star calibration observations and ~5% for the p-band based on lunar calibration observations. The radiance spectra of the Moon, Jupiter, and Saturn from the ONC-T show good agreement with the spacecraft-based observations of the Moon from SP/SELENE and WAC/LROC and with ground-based telescopic observations for Jupiter and Saturn.

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Updated inflight calibration of Hayabusa2's optical navigation camera (ONC) for scientific observations during the cruise phase

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Updated inflight calibration of Hayabusa2's optical navigation camera (ONC) for scientific observations during the cruise phase

書誌事項

この論文をさがす

説明

収録刊行物

被引用文献 (38)*注記

参考文献 (55)*注記

関連研究データ

関連プロジェクト

関連未分類成果物

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