NRHO

NRHO (plural NRHOs)

1. Initialism of near rectilinear halo orbit.
   • 2017; D. Davis; "Orbit maintenance and navigation of human spacecraft at cislunar Near Rectilinear Halo Orbits"; 27th AAS/AIAA Space Flight Mechanics Meeting Proceedings; NASA id: JSC-CN-38626

     An NHRO would enable a cislunar space station to save propellant for orbital corrections and avoid the blocking of sunlight by the Moon from reaching the station’s solar panels, while always keeping the spacecraft within a line of sight to ground controllers on Earth.

   • 2018; Piotr Burnos, Janusz Gajda, Ryszard Sroka; "Accuracy criteria for evaluation of weigh-in-motion systems", Metrology and Measurement Systems, volume 24, issue 4; DOI: 10.24425/mms.2018.124881

     Various aspects of operating the lunar station in a resonant NRHO have been deeply studied, including station-keeping techniques, Earth-NRHO and NRHO-Earth transfer opportunities, challenges in short-term and long-term navigation, eclipse conditions, and shadow avoidance strategies.

   • 2018; C. Hibbits; "Mapping Water on the Moon from a Near-Rectilinear Halo Orbit"; AGU Fall Meeting Proceedings; Bibcode: 2018AGUFM.P54D..08H

     Infrared spectral mapping in the 3 to 6 um range, at the long distance and over the long periods afforded by NRHO orbits can address or answer these questions and have some advantages over lower altitude high spatial resolution mission concepts.

   • 2019; Michelle Star; "Just Look at This Animation of How The First Lunar Outpost Is Going to Orbit The Moon"; Science Alert

     Unlike the low lunar orbit, an NRHO leverages Lagrange points for stability - these are points where the combined gravitational forces of two larger bodies (in this case Earth and the Moon) create a small area of gravitational stability, or near-stability.