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Astrodynamics 2020, 4(2): 163-175 https://doi.org/10.1007/s42064-020-0078-5
Research Article | Issue | Published: 13 June 2020

Simultaneous estimation of spacecraft position and asteroid diameter during final approach of Hayabusa2 to Ryugu

Show Author's Information Yuki Takao( ),  Yuya Mimasu,  Yuichi Tsuda
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan
Keywords:
real time, orbit determination, optical navigation, asteroids, small bodies, size estimation
Cite this article:
Takao Y, Mimasu Y, Tsuda Y. Simultaneous estimation of spacecraft position and asteroid diameter during final approach of Hayabusa2 to Ryugu. Astrodynamics, 2020, 4(2): 163-175. https://doi.org/10.1007/s42064-020-0078-5
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Abstract Full text About this article

This paper presents the optical navigation results of the asteroid explorer Hayabusa2 during the final rendezvous approach phase with the asteroid Ryugu. The orbit determination of Hayabusa2 during the cruising phase uses a triangulation-based method that estimates the probe and asteroid orbits using the directions from which they are observed. Conversely, the asteroid size is available as optical information just prior to arrival. The size information allows us to estimate the relative distance between the probe and the asteroid with high accuracy, that is strongly related to the success or failure of the rendezvous. In this study, the relative distance and asteroid size in real space are simultaneously estimated in real time by focusing on the rate of change of the asteroid size observed in sequential images. The real-time estimation results coincided with those of precise analyses performed after arrival.


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About this article

Simultaneous estimation of spacecraft position and asteroid diameter during final approach of Hayabusa2 to Ryugu

Show Author's information Yuki Takao( ), Yuya Mimasu, Yuichi Tsuda
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan

Abstract

This paper presents the optical navigation results of the asteroid explorer Hayabusa2 during the final rendezvous approach phase with the asteroid Ryugu. The orbit determination of Hayabusa2 during the cruising phase uses a triangulation-based method that estimates the probe and asteroid orbits using the directions from which they are observed. Conversely, the asteroid size is available as optical information just prior to arrival. The size information allows us to estimate the relative distance between the probe and the asteroid with high accuracy, that is strongly related to the success or failure of the rendezvous. In this study, the relative distance and asteroid size in real space are simultaneously estimated in real time by focusing on the rate of change of the asteroid size observed in sequential images. The real-time estimation results coincided with those of precise analyses performed after arrival.

Keywords: real time, orbit determination, optical navigation, asteroids, small bodies, size estimation

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Publication history
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Acknowledgements

Publication history

Received: 31 January 2020
Accepted: 26 March 2020
Published: 13 June 2020
Issue date: June 2020

Copyright

© Tsinghua University Press 2020

Acknowledgements

The authors would like to thank Dr. Hiroshi Takeuchi for his kind support on writing this paper. This work was partially supported by JSPS KAKENHI Grant No. 18H01628.

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