NASA’s Lunar Flashlight Ready to Search for the Moon’s Water Ice
It’s known that water ice exists below the lunar regolith (broken rock and dust), but scientists don’t yet understand whether surface ice frost covers the floors inside these cold craters. To find out, NASA is sending Lunar Flashlight, a small satellite (or SmallSat) no larger than a briefcase. Skimming low over the lunar South Pole, it will use lasers to shed light on these dark craters – much like a prospector looking for hidden treasure by shining a flashlight into a cave. The mission will launch aboard a SpaceX Falcon 9 rocket in mid-November.
“This launch will put the satellite on a trajectory that will take about three months to reach its science orbit. Then Lunar Flashlight will try to find water ice on the surface of the Moon in places that nobody else has been able to look.”
John Baker, the mission’s project manager at NASA’s Jet Propulsion Laboratory in Southern California.
After launch, mission navigators will guide the spacecraft way past the Moon. It will then be slowly pulled back by gravity from Earth and the Sun before it settles into a wide, looping, science-gathering orbit. This near-rectilinear halo orbit will take it 42,000 miles from the Moon at its most distant point and, at its closest approach, the satellite will graze the surface of the Moon, coming within 9 miles above the lunar South Pole.
Lunar Flashlight Spacecraft Will Use A Unique Trajectory
SmallSats carry a limited amount of propellant, so fuel-intensive orbits aren’t possible. A near-rectilinear halo orbit requires far less fuel than traditional orbits, and Lunar Flashlight will be only the second NASA mission to use this type of trajectory. The first is NASA’s Cislunar Autonomous Positioning System Technology Operations and Navigation Experiment (CAPSTONE) mission, which will arrive at its orbit on Nov. 13, making its closest pass over the Moon’s North Pole.
“The reason for this orbit is to be able to come in close enough that Lunar Flashlight can shine its lasers and get a good return from the surface, but to also have a stable orbit that consumes little fuel,” said Barbara Cohen, Lunar Flashlight principal investigator at NASA’s Goddard Space Flight Center in Greenbelt, Maryland.
As a technology demonstration, Lunar Flashlight will be the first interplanetary spacecraft to use a new kind of “green” propellant that is safer to transport and store than the commonly used in-space propellants such as hydrazine. This new propellant, developed by the Air Force Research Laboratory and tested on a previous NASA technology demonstration mission, burns via a catalyst, rather than requiring a separate oxidizer. That is why it’s called a monopropellant.
Lunar Flashlight will also be the first mission to use a four-laser reflectometer to look for water ice on the Moon. The reflectometer works by using near-infrared wavelengths that are readily absorbed by water to identify ice on the surface. Should the lasers hit bare rock, their light will reflect back to the spacecraft, signaling a lack of ice. But if the light is absorbed, it would mean these dark pockets do indeed contain ice. The greater the absorption, the more ice may be at the surface.
NASA’s Small Business Innovation Research program funded component development from small businesses including Plasma Processes Inc. (Rubicon) for thruster development, Flight Works for pump development, and Beehive Aerospace (formerly Volunteer Aerospace) for specific 3D printed components. The Air Force Research Laboratory also contributed financially to the development of the Lunar Flashlight propulsion system.
(Source: NASA JPL news release. Image provided)