@article{Zeng2019, 
author = {Xiangyuan Zeng and Giovanni Vulpetti and Christian Circi},
title = {Solar sail  𝑯-reversal trajectory: A review of its advances and applications},
year = {2019},
journal = {Astrodynamics},
volume = {3},
number = {1},
pages = {1-15},
keywords = {solar-photon sailing, sailcraft, lightness number, orbital H-reversal mode},
url = {https://www.sciopen.com/article/10.1007/s42064-018-0032-y},
doi = {10.1007/s42064-018-0032-y},
abstract = {The set of the orbital angular-momentum reversal, or  H-reversal, sailcraft trajectory was born as a type of unconventional precursor interstellar mission trajectory by using high-performance solar sails. Starting from an outline of the  H-reversal sail trajectory, this paper mainly focuses on the 2D reversal-mode solution to the general solar-photon sail motion equations. The feasible region for  H-reversal trajectories in fixed sail attitude angles is illustrated. Some interesting applications of the  H-reversal trajectory are presented in detail to show its advantages. As a special case, a precursor interstellar probe can be delivered with a constant sail orientation in the  H-reversal trajectory to be compared with the direct-motion sail flyby of the Sun. Of importance are the heliocentric periodic orbits in double  H-reversal modes, obtained via both fixed and time-varying sail attitude angles. Two more applications involving  H-reversal trajectories are discussed in terms of asteroid deflection and transfer trajectory to rectilinear orbits. Finally, some items of the mathematics behind the 3D motion-reversal trajectories are summarized.}
}