Moon Base III

Program context: the Moon Base initiative

NASA has rebranded a set of CLPS missions as Moon Base I, II, and III to highlight their role in building up a lunar base architecture through progressively more capable robotic missions. Together the three missions constitute Phase One of the Moon Base plan, which encompasses 25 launches and 21 landings and aims to deliver approximately 4 metric tons of cargo to the lunar surface before 2029. Moon Base III is the most scientifically focused of the initial trio, targeting a geologically unique site rather than the lunar south pole.

Within this sequence, Moon Base III demonstrates precision landing and operations at a scientifically complex site, integrates rovers and advanced science payloads alongside international contributions, and supports Artemis by improving understanding of lunar surface processes and magnetic environments relevant to future infrastructure. NASA selected Intuitive Machines for IM-3 in 2021 under the CLPS framework, continuing a relationship established when the company was among the first CLPS providers chosen in 2019.

Landing site: Reiner Gamma

Reiner Gamma is a bright, flat albedo feature in Oceanus Procellarum on the lunar near side, centered near 7.5° N, 301.0° E (approximately 59° W). It is the canonical example of a lunar swirl: a bright, sinuous high-albedo marking whose tendrils extend hundreds of kilometers across the dark mare surface. Early observers mistook it for a crater, but spacecraft imaging revealed it is topographically flat, consisting solely of brighter material against the surrounding basalt.

The region coincides with a strong crustal magnetic anomaly, characterized as a magnetized elliptical disk in the lunar crust. Lunar swirls are now understood to form through crustal magnetism interacting with the solar wind: local magnetic fields act as a partial shield, deflecting solar wind particles so that some areas are protected from space weathering and remain bright, while adjacent unshielded areas darken. Because Reiner Gamma shows a very strong correlation between magnetic anomaly and optical swirl, it is a central test case for these models.

Reiner Gamma is also scientifically valuable as a window on the Moon's ancient dynamo. Studies of its magnetization are used to evaluate whether the Moon once sustained a long-lived global magnetic field and to constrain that field's age, intensity, and evolution. The site additionally presents a plasma physics laboratory: the anomaly modifies local plasma flows, making it a prime target for studying mini-magnetospheres on an airless body and for understanding surface charging and radiation environments on magnetized but atmosphere-less worlds.

The Nova-C Trinity lander

Trinity is an Intuitive Machines Nova-C class lander — a hexagonal cylinder standing 3.938 m tall with six landing legs, a launch mass of approximately 1,908 kg, and a payload capacity of up to 100 kg to the lunar surface. The IM-3 manifest carries 91.6 kg of NASA CLPS payloads. The primary structure is carbon-fiber composite. Nova-C is designed to remain stable on slopes up to 10° and to deliver landing loads below 3 g at touchdown, with a target landing accuracy of less than 50 m.

Propulsion is provided by Intuitive Machines' VR900 engine burning liquid oxygen and liquid methane (methalox), producing 3,100 N of thrust, with a gimbaled mount for steering. The reaction control system uses helium-pressurized thrusters of 4.45 N each. IM-1 (Odysseus) was the first spacecraft to demonstrate a methalox propulsion system beyond Earth orbit, validating the higher mass-to-propellant ratio compared to traditional hypergolic systems. Power on the lunar surface is supplied by three solar panels generating approximately 200 W, supplemented by a 25 Ah battery on a 28 VDC bus.

Surface operations for Moon Base III are planned to transmit 9.3 GB of data per day over more than 312 hours — approximately 13 days — via Intuitive Machines' Lunar Telemetry and Tracking Network (LTN). Baseline Nova-C missions are designed for about 14 Earth days of operations within a single lunar day of sunlight.

Intuitive Machines has refined the IM-3 landing approach based on lessons from earlier missions. Trinity will perform 12 lunar orbits before descent (compared to 3 on IM-2) to allow more time to calibrate rangefinders and navigation systems. The descent profile includes a high-altitude braking phase from approximately 15 km to 5 km with engines oriented horizontally, followed by a low-altitude phase with engines reoriented vertically for final touchdown. Navigation sensors include primary and redundant laser rangefinders from two separate vendors, additional altimeters, an expanded onboard terrain and crater database, and a lighting-independent sensor for surface velocity measurement.

International and commercial participation

Moon Base III carries one of the most internationally diverse payload manifests of any early CLPS mission. The European Space Agency contributes the MoonLIGHT Pointing Actuator as part of its lunar laser-ranging program. The Korea Astronomy and Space Science Institute (KASI) provides the Lunar Space Environment Monitor (LUSEM) to measure high-energy particles near the surface. These international contributions extend the mission's scientific return well beyond the magnetic swirl investigation alone.

Commercial payloads are also part of the manifest. AstroForge's Vestri payload and the Lunaria One ALEPH-1 plant growth experiment represent commercial and non-traditional science customers. Intuitive Machines' company materials note additional experiments including autonomous robots and radiation sensors. The Khon-1 relay satellite, while an Intuitive Machines asset, provides a commercial communications service under NASA's Near Space Network Services (NSNS) contract, and is intended to anchor a broader Lunar Data Network constellation — with two further satellites planned on IM-4 in 2027.