NASA's Lunar Flashlight ready to search for the Moon's water ice
https://phys.org/news/2022-10-nasa-luna ... -moon.html
by Ian J. O'Neill, Jet Propulsion Laboratory
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. Swooping 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," said John Baker, the mission's project manager at NASA's Jet Propulsion Laboratory in Southern California. "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."
Fuel-efficient orbits
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 (70,000 kilometers) 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 (15 kilometers) above the lunar South Pole.
SmallSats carry a limited amount of propellent, 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.