A near rectilinear halo orbit (NRHO) is regarded as a potential orbit for a future deep space
station that can effectively support sustainable crewed lunar exploration missions. In this …

This paper presents the results of both a high-fidelity simulation of spacecraft orbit
determination in a near rectilinear halo orbit (NRHO), as well as investigations of various …

Ballistic lunar transfers exploit the gravitational influence of the Earth, Moon, and Sun to
reduce propellant costs associated with transfers from the Earth to the lunar vicinity via …

An increasing interest in lunar exploration calls for low-cost techniques of reaching the
Moon. Ballistic lunar transfers are long duration trajectories that leverage solar perturbations …

Multimode spacecraft propulsion combines two or more propulsive modes into a single
system using a single propellant. In this study, a multimode system combining a …

Low-energy ballistic lunar transfers offer propellant efficient paths to the Moon in exchange
for longer duration flights. These trajectories rely on the gravitational influence of the Sun to …

This research presents a geometric analysis of Sun-assisted low-energy lunar transfers and
several convenient tools that enable the systematic trajectory design in the framework of the …

Low-energy transfers offer propellant-efficient paths to the Moon. This investigation
introduces techniques for constructing low-energy lunar transfers with a focus on the trade …

This paper documents the current design reference mission planned for the first two
elements of NASA's Gateway. When launched together, the Power and Pro-pulsion Element …

The search for extraterrestrial life is one of the great adventures of our time, and we may not
need to look farther than our own solar system to find it. Scientists have identified several …