Near-rectilinear halo orbit

By 2022, the company Advanced Space built a 12-unit cubesat to fly on a Gateway precursor mission for NASA.

Named CAPSTONE (Cislunar Autonomous Positioning System Technology Operations and Navigation Experiment), the spacecraft became the first spacecraft to operate in an NRHO lunar orbit from 14 November 2022 after launch on 28 June 2022.

[6][7] The mission objective is to test and verify the calculated orbital stability planned later for the Lunar Gateway space station, and the spacecraft will fly the identical orbital parameters planned later for Gateway.

It will also test a navigation system that will measure spacecraft position relative to NASA's Lunar Reconnaissance Orbiter (LRO), without relying on ground stations.

The Gateway orbit will be a 9:2 resonant NRHO,[13] with a period of about 7 days and a high orbital eccentricity, bringing the station within 3,000 kilometers (1,900 mi) of the lunar north pole at closest approach and as far away as 70,000 kilometers (43,000 mi) over the lunar south pole.

Near-rectilinear halo orbit (NRHO) in cislunar space, as illustrated by A.I. Solutions, Inc. using the FreeFlyer software.
Earth-Moon Lagrangian points: a spacecraft in an NRHO around the L2 Lagrange point would have a view of Earth unobstructed by the Moon.
Overview of NRHOs around the Moon