Dynamic precise orbit determination of Hayabusa2 using laser altimeter (LIDAR) and image tracking data sets
Posted on 2020-06-13 - 03:27
Abstract The precise orbit of the Hayabusa2 spacecraft with respect to asteroid Ryugu is dynamically determined using the data sets collected by the spacecraft’s onboard laser altimeter (LIght Detection And Ranging, LIDAR) and automated image tracking (AIT). The LIDAR range data and the AIT angular data play complementary roles because LIDAR is sensitive to the line-of-sight direction from Hayabusa2 to Ryugu, while the AIT is sensitive to the directions perpendicular to it. Using LIDAR and AIT, all six components of the initial state vector can be derived stably, which is difficult to achieve using only LIDAR or AIT. The coefficient of solar radiation pressure (SRP) of the Hayabusa2 spacecraft and standard gravitational parameter (GM) of Ryugu can also be estimated in the orbit determination process, by combining multiple orbit arcs at various altitudes. In the process of orbit determination, the Ryugu-fixed coordinate of the center of the LIDAR spot is determined by fitting the range data geometrically to the topography of Ryugu using the Markov Chain Monte Carlo method. Such an approach is effective for realizing the rapid convergence of the solution. The root mean squares of the residuals of the observed minus computed values of the range and brightness-centroid direction of the image are 1.36 m and 0.0270°, respectively. The estimated values of the GM of Ryugu and a correction factor to our initial SRP model are 29.8 ± 0.3 m3/s2 and 1.13 ± 0.16, respectively.
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Yamamoto, Keiko; Otsubo, Toshimichi; Matsumoto, Koji; Noda, Hirotomo; Namiki, Noriyuki; Takeuchi, Hiroshi; et al. (2020). Dynamic precise orbit determination of Hayabusa2 using laser altimeter (LIDAR) and image tracking data sets. figshare. Collection. https://doi.org/10.6084/m9.figshare.c.5020106.v1
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AUTHORS (38)
KY
Keiko Yamamoto
TO
Toshimichi Otsubo
KM
Koji Matsumoto
HN
Hirotomo Noda
NN
Noriyuki Namiki
HT
Hiroshi Takeuchi
HI
Hitoshi Ikeda
MY
Makoto Yoshikawa
YY
Yukio Yamamoto
HS
Hiroki Senshu
TM
Takahide Mizuno
NH
Naru Hirata
RY
Ryuhei Yamada
YI
Yoshiaki Ishihara
HA
Hiroshi Araki
SA
Shinsuke Abe
FY
Fumi Yoshida
AH
Arika Higuchi
SS
Sho Sasaki
SO
Shoko Oshigami