@article{Takei2020, 
author = {Yuto Takei and Takanao Saiki and Yukio Yamamoto and Yuya Mimasu and Hiroshi Takeuchi and Hitoshi Ikeda and Naoko Ogawa and Fuyuto Terui and Go Ono and Kent Yoshikawa and Tadateru Takahashi and Hirotaka Sawada and Chikako Hirose and Shota Kikuchi and Atsushi Fujii and Takahiro Iwata and Satoru Nakazawa and Masahiko Hayakawa and Ryudo Tsukizaki and Satoshi Tanaka and Masanori Matsushita and Osamu Mori and Daiki Koda and Takanobu Shimada and Masanobu Ozaki and Masanao Abe and Satoshi Hosoda and Tatsuaki Okada and Hajime Yano and Takaaki Kato and Seiji Yasuda and Kota Matsushima and Tetsuya Masuda and Makoto Yoshikawa and Yuichi Tsuda},
title = {Hayabusa2’s station-keeping operation in the proximity of the asteroid Ryugu},
year = {2020},
journal = {Astrodynamics},
volume = {4},
number = {4},
pages = {349-375},
keywords = {small body mission, station-keeping, guidance, navigation, and control (GNC), optical and radiometric navigation},
url = {https://www.sciopen.com/article/10.1007/s42064-020-0083-8},
doi = {10.1007/s42064-020-0083-8},
abstract = {The Japanese interplanetary probe Hayabusa2 was launched on December 3, 2014 and the probe arrived at the vicinity of asteroid 162173 Ryugu on June 27, 2018. During its 1.4 years of asteroid proximity phase, the probe successfully accomplished numbers of record-breaking achievements including two touchdowns and one artificial cratering experiment, which are highly expected to have secured surface and subsurface samples from the asteroid inside its sample container for the first time in history. The Hayabusa2 spacecraft was designed not to orbit but to hover above the asteroid along the sub-Earth line. This orbital and geometrical configuration allows the spacecraft to utilize its high-gain antennas for telecommunication with the ground station on Earth while pointing its scientific observation and navigation sensors at the asteroid. This paper focuses on the regular station-keeping operation of Hayabusa2, which is called "home position" (HP)-keeping operation. First, together with the spacecraft design, an operation scheme called HP navigation (HPNAV), which includes a daily trajectory control and scientific observations as regular activities, is introduced. Following the description on the guidance, navigation, and control design as well as the framework of optical and radiometric navigation, the results of the HP-keeping operation including trajectory estimation and delta- V planning during the entire asteroid proximity phase are summarized and evaluated as a first report. Consequently, this paper states that the HP-keeping operation in the framework of HPNAV had succeeded without critical incidents, and the number of trajectory control delta- V was planned efficiently throughout the period.}
}