According to the space agencies, the Gateway will follow a (https://www.esa.int/Our_Activities/Operations/Angelic_halo_orbit_chosen_for_humankind_s_first_lunar_outpost) near-rectilinear halo orbit
The satellite has successfully entered a halo orbit
around the second Lagrangian (L2) point of the earth-moon system, about 455,000 km from the earth.
A relay satellite, named Queqiao (Magpie Bridge), for Chang'e-4 has entered a Halo orbit
around the second Lagrangian (L2) point of the Earth-Moon system, about 65,000 km from the Moon in June.
This means that by rendezvousing with the asteroid and holding a halo orbit
in the appropriate direction, the ARM robotic spacecraft can slowly pull the asteroid without touching it.
Astronomers have discovered two exoplanets orbiting Kapteyn's Star, a nearby, dim M dwarf in a Milky Way Galaxy halo orbit
that likely formed in another galaxy.
This Apollo-on-steroids vehicle would be lofted into a halo orbit
about the Earth-moon Lagrange point L2.
McInnes  is the first person who applied the classical libration point orbit theory to generate the halo orbit
around the on-axis sail's equilibrium.
The telescope will be in a very large 800,000 kilometres radius halo orbit
around L2, and so will avoid any part of Earth's shadow.
With exactly the required parameters: halo orbit
around the L-2 Earth Lagrange point.
He covers such fundamental maneuvering problems as halo orbit
determination, rendezvous and orbital transfers as well.