A SpaceX Falcon 9 rocket blasted into space in the wee hours of Dec. 11. Its main cargo was the HAKUTO-R lunar lander from Japan’s Ispace, but NASA had a fascinating little ride-along payload on the rocket, too. The agency’s Lunar Flashlight mission is now en route to the moon, where it will search for water in regions that haven’t seen sunlight for billions of years.
The Lunar Flashlight is a compact 6U CubeSat, sporting mostly off-the-shelf hardware like a conventional lithium-ion battery and HaWK solar panels. There’s also a flashlight of sorts, as the name implies. It’s actually an infrared spectrometer that emits light in four different wavelengths. We already know there is frozen water on the moon, but the Lunar Flashlight aims to create a more accurate map of its distribution. It will scan the shadowy depths of craters where sunlight has never reached, mostly in the higher latitudes.
When shined on the lunar surface, the infrared lasers will bounce back after striking regolith. However, water ice will absorb light and give away its presence. Locating an accessible supply of ice on the moon could be a boon to future missions, which could use lunar water to make fuel for a return trip to Earth or a trip to the outer solar system.
The Lunar Flashlight is currently meandering its way to the moon, but it’s not using standard hydrazine fuel, which is highly toxic. Instead, NASA is testing the Advanced Spacecraft Energetic Non-Toxic (ASCENT) monopropellant. The Lunar Flashlight should reach the moon in about four months, and when there, it will use its green engine to enter a near-rectilinear halo orbit (NRHO), making it just the second spacecraft to do so. The first was NASA’s Cislunar Autonomous Positioning System Technology Operations and Navigation Experiment (CAPSTONE) mission, which proved this novel orbit was workable earlier this year.
The Lunar Flashlight during assembly. Credit: NASA/JPL-Caltech
In NRHO, the Lunar Flashlight will orbit 9 miles (15 kilometers) over the lunar South Pole and 43,000 miles (70,000 kilometers) at its highest point — you can track its progress with NASA’s Eyes on the Solar System. This vantage keeps the spacecraft in constant contact with Earth and requires less energy than a traditional orbit. NASA also plans to deploy the upcoming Lunar Gateway station in a near-rectilinear halo orbit.
The Lunar Flashlight is a collaboration between the Jet Propulsion Laboratory, the Goddard Space Flight Center, the Georgia Institute of Technology, and NASA’s Marshall Space Flight Center. It was originally supposed to ride along with Artemis 1, but it missed the window to be integrated with that spacecraft. Both Artemis 1 and the Lunar Flashlight will move NASA closer to returning humans to the moon with Artemis 3.
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