The orbit determination of (4179) Toutatis from optical and radar data

Krivova, N. V.; Yagudina, E. I.; Shor, V. A.

doi:10.1016/0032-0633(94)90116-3

Cited by 8 publications

(7 citation statements)

References 2 publications

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“… Using the data released by the Minor Planet Center 34 35 and optical data from the ground-based observational campaign sponsored by the Chinese Academy of Sciences, we determined Toutatis' orbit with uncertainties on the order of several kilometers. Osculating orbital elements were calculated for the flyby epoch of 13 December 2012 at 8:30 UTC, where a , e , i , Ω, ω , and M are the semi-major axis, the eccentricity, the inclination, the longitude of the ascending node, the argument of perihelion, and the mean anomaly, respectively.…”

Section: Figurementioning

confidence: 99%

The Ginger-shaped Asteroid 4179 Toutatis: New Observations from a Successful Flyby of Chang'e-2

et al. 2013

Sci Rep

104

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On 13 December 2012, Chang'e-2 conducted a successful flyby of the near-Earth asteroid 4179 Toutatis at a closest distance of 770 ± 120 meters from the asteroid's surface. The highest-resolution image, with a resolution of better than 3 meters, reveals new discoveries on the asteroid, e.g., a giant basin at the big end, a sharply perpendicular silhouette near the neck region, and direct evidence of boulders and regolith, which suggests that Toutatis may bear a rubble-pile structure. Toutatis' maximum physical length and width are (4.75 × 1.95 km) ±10%, respectively, and the direction of the +z axis is estimated to be (250 ± 5°, 63 ± 5°) with respect to the J2000 ecliptic coordinate system. The bifurcated configuration is indicative of a contact binary origin for Toutatis, which is composed of two lobes (head and body). Chang'e-2 observations have significantly improved our understanding of the characteristics, formation, and evolution of asteroids in general.

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Section: Figurementioning

confidence: 99%

The Ginger-shaped Asteroid 4179 Toutatis: New Observations from a Successful Flyby of Chang'e-2

et al. 2013

Sci Rep

104

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“…During the 100-second imaging, the gravitational force of the sun and major planets, the solar radiation pressure (SRP) on Chang'e 2, and other perturbation sources all can impact the relative velocity between Chang'e 2 and Toutatis. In particular, the gravitational force of the sun, SRP, and gravitational force of Jupiter are the three largest influencing factors, as the relative perturbation velocities caused by them are .In conclusion, if the relative velocity before the fly-by is 10.7km/s, the relative velocity variation caused by various gravitational forces in the imaging process during the fly-by is less than 6 …”

Section: B Relative Positional Relationmentioning

confidence: 91%

“…After the last orbit maneuver, Chang'e 2 became a man-made near-earth asteroid in the solar system, with an approximately 17-year period of revolution [6] , whereas the period of revolution of Toutatis is approximately 4 years. During the 100-second imaging, the gravitational force of the sun and major planets, the solar radiation pressure (SRP) on Chang'e 2, and other perturbation sources all can impact the relative velocity between Chang'e 2 and Toutatis.…”

Section: B Relative Positional Relationmentioning

confidence: 99%

Numerical verification algorithm for relative positioning accuracy between chang'e 2 and Asteroid Toutatis of 2012 Flyby

Ding

Liu

et al. 2014

Proceedings of 2014 IEEE Chinese Guidance, Navigation and Control Conference

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On December 13, 2012, China's Chang'e 2 Spacecraft successfully flew past No.4179 Asteroid Toutatis, and acquired a series of clear optical images concerning Toutatis.The data obtained is very important for us to be able to establish feasible methods for deep-space optical navigation. However, as the fly-by process cannot be repeated and deep-space environments cannot be tested using physical platforms on the ground, the problem concerning how to verify the correctness and accuracy of optical positioning algorithms emerges. According to the fly-by strategy of Chang'e 2 to detect Toutatis, in combination with navigation motion relationships between the spacecraft and the asteroid, such as orbit and position, and in light of actual data and problem models, the paper constructs a set of algorithms of ground numerical appraisal for relative positioning accuracy when Chang'e 2 flies past Toutatis. Through three relative positioning algorithms, conducting algorithm testing of ground numerical appraisal, which effectively appraises the positioning algorithm accuracy through numerical methods and clearly explains the sources of random error and system error, This method can be used as the basic means for ground verification of deep-space optical navigation algorithms. 978-1-4799-4699-0/14/$31.

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“…中国科学院紫金山天文台的张家祥和张钰哲等人 [13,14] 较早地开始了小行星轨道确定的研究工作, 包括对小行星摄动模型的改进, 以及对 134 号小行星 Sopllrosyne 等的轨道改进. 早期国外学者针对图塔蒂斯也进行过轨道确定的工作 [15] ,…”

Section: 小行星一般指的是围绕太阳运行的体积较小的unclassified

嫦娥二号飞越小行星试验中图塔蒂斯轨道确定与精度分析

季¹,

胡²,

孟³

et al. 2013

Sci. Sin.-Tech.

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The orbit determination of (4179) Toutatis from optical and radar data

Cited by 8 publications

References 2 publications

The Ginger-shaped Asteroid 4179 Toutatis: New Observations from a Successful Flyby of Chang'e-2

The Ginger-shaped Asteroid 4179 Toutatis: New Observations from a Successful Flyby of Chang'e-2

Numerical verification algorithm for relative positioning accuracy between chang'e 2 and Asteroid Toutatis of 2012 Flyby

嫦娥二号飞越小行星试验中图塔蒂斯轨道确定与精度分析

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