Improving Hayabusa2 trajectory by combining LIDAR data and a shape model

Matsumoto, Koji; Noda, Hirotomo; Ishihara, Yoshiaki; Senshu, Hiroki; Yamamoto, Keiko; Hirata, Naru; Hirata, Naoyuki; Namiki, Noriyuki; Otsubo, Toshimichi; Higuchi, Arika; Watanabe, Sei‐ichiro; Ikeda, Hitoshi; Mizuno, Takahide; Yamada, Ryuhei; Araki, Hiroshi; Abe, Shinsuke; Yoshida, Fumi; Sasaki, Sho; Oshigami, Shoko; Tsuruta, Seiitsu; Asari, Kazuyoshi; Shizugami, Makoto; Yamamoto, Yukio; Ogawa, Naoko; Kikuchi, Shota; Saiki, Takanao; Tsuda, Yuichi; Yoshikawa, Makoto; Tanaka, Satoshi; Terui, Fuyuto; Nakazawa, Shozo; Yamaguchi, Tomohiro; Takei, Yuto; Takeuchi, Hiroshi; Okada, Tatsuaki; Shimaki, Y.; Shirai, Kei; Ogawa, Kazunori; Iijima, Y.

doi:10.1016/j.icarus.2019.113574

Cited by 17 publications

(34 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, for the current analysis of data from mid-altitude operation (see subsection Selected data and comparison method), we utilized another image-based trajectory also provided by the engineering team during this special science observation period. Although the image-based trajectory was better than the HPK trajectory and the same method as Matsumoto et al (2020) was applied in this study, the resultant footprint position may be less accurate than that in Matsumoto et al (2020). This is because the method relies on along-track topographic information, i.e., it is difficult to retain a sufficiently long unperturbed arc due to more frequent thrusting to maintain the spacecraft altitude between 5.1 and 5.2 km.…”

Section: Lidarmentioning

confidence: 97%

“…This was carried out after estimating the spacecraft trajectory using the LIDAR measurements. We adjusted spacecraft positions such that convex or concave topographic features contained in the LIDAR tracks were fit to the existing global shape model (Matsumoto et al 2020). The correction term with respect to the given initial trajectory was expressed by a polynomial function of time, and we searched for the best correction that minimized the discrepancy using the Markov chain Monte Carlo (MCMC) method.…”

Section: Lidarmentioning

confidence: 99%

“…The correction term with respect to the given initial trajectory was expressed by a polynomial function of time, and we searched for the best correction that minimized the discrepancy using the Markov chain Monte Carlo (MCMC) method. Matsumoto et al (2020) used the home position keeping (HPK) trajectory routinely provided by the Hay-abusa2 engineering team as the initial trajectory. However, for the current analysis of data from mid-altitude operation (see subsection Selected data and comparison method), we utilized another image-based trajectory also provided by the engineering team during this special science observation period.…”

Section: Lidarmentioning

confidence: 99%

“…These image data must be well scaled to the shape model, such that the spacecraft position at the time of imaging is also determined. The second is to adjust the spacecraft positions such that topographic features contained in tracks of the laser altimeter (called Light Detection and Ranging (LIDAR) for the Hayabusa2 mission) fit to the global shape model that exists at the time of estimation (Matsumoto et al 2020). The latter is useful for longer-period orbit determination, because typically the cadence of image acquisition is relatively low due to the data downlink budget.…”

Section: Introductionmentioning

confidence: 99%

“…This study attempts to constrain LIDAR alignment by using distinctive surface features of the asteroid taken by the altimeter and an imaging camera. A detailed description of the precise orbit determination by LIDAR data is found in Matsumoto et al (2020). This study focuses on the alignment determination of LIDAR.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Alignment determination of the Hayabusa2 laser altimeter (LIDAR)

Noda

Senshu

Matsumoto

et al. 2021

Earth Planets Space

Self Cite

View full text Add to dashboard Cite

In this study, we determined the alignment of the laser altimeter aboard Hayabusa2 with respect to the spacecraft using in-flight data. Since the laser altimeter data were used to estimate the trajectory of the Hayabusa2 spacecraft, the pointing direction of the altimeter needed to be accurately determined. The boresight direction of the receiving telescope was estimated by comparing elevations of the laser altimeter data and camera images, and was confirmed by identifying prominent terrains of other datasets. The estimated boresight direction obtained by the laser link experiment in the winter of 2015, during the Earth’s gravity assist operation period, differed from the direction estimated in this study, which fell on another part of the candidate direction; this was not selected in a previous study. Assuming that the uncertainty of alignment determination of the laser altimeter boresight was 4.6 pixels in the camera image, the trajectory error of the spacecraft in the cross- and/or along-track directions was determined to be 0.4, 2.1, or 8.6 m for altitudes of 1, 5, or 20 km, respectively.

show abstract

Section: Lidarmentioning

confidence: 97%

Section: Lidarmentioning

confidence: 99%

Section: Lidarmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Alignment determination of the Hayabusa2 laser altimeter (LIDAR)

Noda

Senshu

Matsumoto

et al. 2021

Earth Planets Space

Self Cite

View full text Add to dashboard Cite

show abstract

Geologic History and Crater Morphology of Asteroid (162173) Ryugu

Cho

Morota

Kanamaru

et al. 2021

Preprint

View full text Add to dashboard Cite

Crater morphology and surface age of asteroid (162173) Ryugu are characterized using the high-resolution images obtained by the Hayabusa2 spacecraft. Our observations reveal that the abundant boulders on and under the surface of the rubble-pile asteroid affect crater morphology. Most of the craters on Ryugu exhibit well-defined circular depressions, unlike those observed on asteroid Itokawa. The craters are typically outlined by boulders remaining on the rim. Large craters (diameter > 100 m) host abundant and sometimes unproportionally large boulders on their floors. Small craters (<20 m) are characterized by smooth circular floors distinguishable from the boulder-rich exterior. Such small craters tend to have dark centers of unclear origin. The correlation between crater size and boulder number density suggests that some processes sort the size of boulders in the shallow (<30 m) subsurface. Furthermore, the crater size-frequency distributions (CSFDs) of different regions on Ryugu record multiple geologic events, revealing the diverse geologic history on this 1-km asteroid. Our crater-counting analyses indicate that the equatorial ridge is the oldest structure of Ryugu and was formed 23-30 Myr ago. Then, Ryugu was partially resurfaced, possibly by the impact that formed the Urashima crater 5-12 Myr ago. Subsequently, a large-scale resurfacing event formed the western bulge and the fossae 2-9 Myr ago. Following this process, the spin of Ryugu slowed down plausibly due to the YORP effect. The transition of isochrons in a CSFD suggests that Ryugu was decoupled from the main belt and transferred to a near-Earth orbit 0.2-7 Myr ago.

show abstract

Crater depth-to-diameter ratios on asteroid 162173 Ryugu

Noguchi

Hirata

et al. 2021

Icarus

View full text Add to dashboard Cite

Improving Hayabusa2 trajectory by combining LIDAR data and a shape model

Cited by 17 publications

References 18 publications

Alignment determination of the Hayabusa2 laser altimeter (LIDAR)

Alignment determination of the Hayabusa2 laser altimeter (LIDAR)

Geologic History and Crater Morphology of Asteroid (162173) Ryugu

Crater depth-to-diameter ratios on asteroid 162173 Ryugu

Contact Info

Product

Resources

About