The characteristics of asteroids are vital parameters for planning asteroid exploration missions.These characteristics have been explored in close range for some typical asteroids,and are summarized in the article.Thi...The characteristics of asteroids are vital parameters for planning asteroid exploration missions.These characteristics have been explored in close range for some typical asteroids,and are summarized in the article.This allows estimates of the characteristics of asteroid 2016HO_(3),the target of the first Chinese asteroid exploration mission,Tianwen 2.We obtain 80 characteristic parameters in 9 categories and analyze their impacts on the mission.By comparing three close-range exploration modes,we provide advantages and disadvantages of each,and propose suitable methods for the exploration of 2016HO_(3).Owing to the weak gravity and small size of 2016HO_(3),a combination of multiple hovering positions and active orbiting is recommended for scientific exploration.展开更多
In this paper,we investigate the orbital behavior of the transition between the quasisatellite(QS)and horseshoe(HS)motions of 2016 HO3.Based on the phase space structure in the Sun-Earth circular restricted three-body...In this paper,we investigate the orbital behavior of the transition between the quasisatellite(QS)and horseshoe(HS)motions of 2016 HO3.Based on the phase space structure in the Sun-Earth circular restricted three-body problem,we find that the surface of 2016 HO in the torus space is a compound surface formed by QS and HS portions.Its co-orbital motion is therefore a QS-HS transition.2016 HO3 is currently located in a QS state,and its locus clings to the QS portion in the isosurface in agreement with the semi-analytical results.We provide a criterion to separate the QS and HS stages in the transition and obtain accurate incoming and outgoing epochs of the QS motion.We then propose an approximate curve to describe the locus of 2016 HO3 in the w-e projection.Virtual asteroids(VAs)near 2016 HO in the isosurface were created to study the infuence of the initial state of the QS-HS transition.We find that the duration of the QS state is mainly influenced by the loci in the w-e projection.The VAs with large QS durations usually have longer loci across the QS region than those with shorter durations.In addition,although some VAs are close to 2016 HO3 in the w-e projection,their co-orbital behaviors are significantly different from that of the latter.This indicates that the QS-HS transition of 2016 HO3 is sensitive to the(w,e)position.展开更多
This paper proposes the use of solar-sail technology currently under development at NASA Langley Research Center for a CubeSat rendezvous mission with asteroid 2016 HO_(3),a quasi-satellite of Earth.Time-optimal traje...This paper proposes the use of solar-sail technology currently under development at NASA Langley Research Center for a CubeSat rendezvous mission with asteroid 2016 HO_(3),a quasi-satellite of Earth.Time-optimal trajectories are sought for within a 2022–202_(3) launch window,starting from an assumed launcher ejection condition in the Earth-Moon system.The optimal control problem is solved through a particular implementation of a direct pseudo-spectral method for which initial guesses are generated through a relatively simple and straightforward genetic algorithm search on the optimal launch date and sail attitude.The results show that the trajectories take 2.16–4.21 years to complete,depending on the assumed solar-sail reflectance model and solar-sail technology.To assess the performance of solar-sail propulsion for this mission,the trajectory is also designed assuming the use of solar electric propulsion.The resulting fuel-optimal trajectories take longer to complete than the solar-sail trajectories and require a propellant consumption that exceeds the expected propellant capacity onboard the CubeSat.This comparison demonstrates the superior performance of solar-sail technology for this mission.展开更多
文摘The characteristics of asteroids are vital parameters for planning asteroid exploration missions.These characteristics have been explored in close range for some typical asteroids,and are summarized in the article.This allows estimates of the characteristics of asteroid 2016HO_(3),the target of the first Chinese asteroid exploration mission,Tianwen 2.We obtain 80 characteristic parameters in 9 categories and analyze their impacts on the mission.By comparing three close-range exploration modes,we provide advantages and disadvantages of each,and propose suitable methods for the exploration of 2016HO_(3).Owing to the weak gravity and small size of 2016HO_(3),a combination of multiple hovering positions and active orbiting is recommended for scientific exploration.
基金supported by the Beijing Institute of Technology Research Fund Program for Young Scholars。
文摘In this paper,we investigate the orbital behavior of the transition between the quasisatellite(QS)and horseshoe(HS)motions of 2016 HO3.Based on the phase space structure in the Sun-Earth circular restricted three-body problem,we find that the surface of 2016 HO in the torus space is a compound surface formed by QS and HS portions.Its co-orbital motion is therefore a QS-HS transition.2016 HO3 is currently located in a QS state,and its locus clings to the QS portion in the isosurface in agreement with the semi-analytical results.We provide a criterion to separate the QS and HS stages in the transition and obtain accurate incoming and outgoing epochs of the QS motion.We then propose an approximate curve to describe the locus of 2016 HO3 in the w-e projection.Virtual asteroids(VAs)near 2016 HO in the isosurface were created to study the infuence of the initial state of the QS-HS transition.We find that the duration of the QS state is mainly influenced by the loci in the w-e projection.The VAs with large QS durations usually have longer loci across the QS region than those with shorter durations.In addition,although some VAs are close to 2016 HO3 in the w-e projection,their co-orbital behaviors are significantly different from that of the latter.This indicates that the QS-HS transition of 2016 HO3 is sensitive to the(w,e)position.
基金Jeannette Heiligers would like to acknowledge support from the Marie Skłdowska-Curie Individual Fellowship 658645-S4ILS:Solar Sailing for Space Situational Awareness in the Lunar System.
文摘This paper proposes the use of solar-sail technology currently under development at NASA Langley Research Center for a CubeSat rendezvous mission with asteroid 2016 HO_(3),a quasi-satellite of Earth.Time-optimal trajectories are sought for within a 2022–202_(3) launch window,starting from an assumed launcher ejection condition in the Earth-Moon system.The optimal control problem is solved through a particular implementation of a direct pseudo-spectral method for which initial guesses are generated through a relatively simple and straightforward genetic algorithm search on the optimal launch date and sail attitude.The results show that the trajectories take 2.16–4.21 years to complete,depending on the assumed solar-sail reflectance model and solar-sail technology.To assess the performance of solar-sail propulsion for this mission,the trajectory is also designed assuming the use of solar electric propulsion.The resulting fuel-optimal trajectories take longer to complete than the solar-sail trajectories and require a propellant consumption that exceeds the expected propellant capacity onboard the CubeSat.This comparison demonstrates the superior performance of solar-sail technology for this mission.
