Lunar Flashlight

NASA's Lunar Crater Observation and Sensing Satellite (LCROSS), the Lunar Reconnaissance Orbiter (LRO) and India's Chandrayaan-1 lunar orbiters and other missions discovered in 2009 both water (H₂O) and hydroxyl (—OH⁻) deposits at high latitudes on the lunar surface, indicating the presence of trace amounts of adsorbed or bound water are present. These missions suggest that there might be enough ice water at polar regions to be used by future landed missions, but the distribution is difficult to reconcile with thermal maps.

Lunar prospecting missions are intended to pave the way toward incorporating use of space resources into mission architectures. NASA's planning for eventual human mission to Mars depends on tapping the local natural resources to make oxygen and propellant for launching the return ship back to Earth, and a lunar precursor mission is a convenient location to test such in situ resource utilization (ISRU) technology.{{cite web|url=https://sservi.nasa.gov/articles/nasa-looking-to-mine-water-on-the-moon-and-mars/|title=NASA Looking to Mine Water on the Moon and Mars|work=Solar System Exploration Research Virtual Institute (SSERVI)|publisher=NASA|date=2015|access-date=11 March 2021}} {{PD-notice}}

The mission concept was developed by a team from the Jet Propulsion Laboratory (JPL), the University of California, Los Angeles (UCLA), and NASA Marshall Space Flight Center and proposed to NASA's FY2014 Advanced Exploration Systems (AES) call. The mission was selected for funding in early 2015.{{cite news |last=Misra|first=Ria|url=https://gizmodo.com/nasa-s-first-mission-to-mars-will-include-a-giant-laser-1756615948|title=NASA's New Mission to Mars Will Include a Giant Laser "Lunar Flashlight"|publisher=Gizmodo |date=2 February 2016|access-date=11 March 2021}}

In its original conception, the Lunar Flashlight spacecraft would have been a 6U CubeSat format or bus propelled by an 80 m² solar sail that would also have functioned as reflector to illuminate some selected permanently shadowed areas on the Moon, while an onboard infrared spectrometer measured the reflected spectrum diagnostic of surface compositional mix among rock/dust, regolith, water ice, CO₂, methane ice (CH₄), and possibly ammonia ice (NH₃). The illuminated spot would have been about {{cvt|400|m}} in diameter, reflected from an altitude of {{cvt|20|km}}.

In the final design, the Lunar Flashlight spacecraft includes two sets of solar arrays. One set delivered by Blue Canyon Technologies (BCT) which deploys upon release from the dispenser and another delivered by MMA which use a burnwire deployment mechanism. The Command and Data Handling is provided via the JPL-developed Sphinx processor with flight software written using the JPL-developed FPrime software framework. The on-board radio is an Iris radio developed by JPL and build by Space Dynamics Laboratory. The attitude determination and control system (ADCS) for the spacecraft is provided by a BCT XACT-50. The spacecraft includes a chemical propulsion system to provide the impulse needed for Lunar Orbital Insertion (LOI). This propulsion system was designed and built by Georgia Tech’s Glenn Lightsey Research Group in collaboration with the NASA Marshall Space Flight Center. Finally, the science instrument payload is a compact Short Wave Infrared (SWIR) Laser reflectometer.{{Cite journal |last1=Cheek |first1=Nathan |last2=Gonzalez |first2=Collin |last3=Adell |first3=Phillippe |last4=Baker |first4=John |last5=Ryan |first5=Chad |last6=Statham |first6=Shannon |last7=Lightsey |first7=E. |last8=Smith |first8=Celeste |last9=Awald |first9=Conner |last10=Ready |first10=Jud |date=2022-08-08 |title=Systems Integration and Test of the Lunar Flashlight Spacecraft |url=https://digitalcommons.usu.edu/smallsat/2022/all2022/149 |journal=Small Satellite Conference}}

The goal of Lunar Flashlight is to determine the presence or absence of exposed water ice and its physical state, and map its concentration at the 1-2 kilometer scale within the permanently shadowed regions of the lunar south pole.{{cite web|url=https://www.hou.usra.edu/meetings/leag2014/pdf/3031.pdf|title=LUNAR FLASHLIGHT: MAPPING LUNAR SURFACE VOLATILES USING A CUBESAT |work=Annual Meeting of the Lunar Exploration Analysis Group (2014)|date=2014|access-date=11 March 2021}}{{cite journal|url=https://www.spie.org/news/6241-cubesat-for-investigating-ice-on-the-moon?SSO=1|last1=Cohen|first1=Barbara|title=CubeSat for investigating ice on the Moon|journal=SPIE Newsroom|publisher=SPIE.org|year=2016|issn=1818-2259|doi=10.1117/2.1201601.006241|access-date=11 March 2021}} The mission will be one of the first CubeSats to reach the Moon, and the first mission to use lasers to look for water ice. Any polar volatile data collected by Lunar Flashlight could then ensure the most appropriate landing sites for a more expensive rover to perform in situ measurements and chemical analyses. The spacecraft will maneuver to its lunar polar orbit and use its near infrared lasers to shine light into the shaded polar regions, while the on-board spectrometer measures surface reflection and composition. Barbara Cohen from the NASA Goddard Space Flight Center is the principal investigator.

File:Lunar Flashlight Post-Integration.jpg

The proposed payload on this nanosatellite is an infrared spectrometer, consisting of a lens, dichroic beam splitters and multiple single-element detectors. It occupies 2 of the 6 modules of the 6U CubeSat bus. The attitude control system (Blue Canyon Technologies' XACT-50), command and data handling, and power systems will occupy 1.5U; the Iris telecom system will occupy 0.5U.

The Lunar Flashlight payload is derived from a few predecessor systems, including JPL's INSPIRE (Interplanetary Nano-Spacecraft Pathfinder In Relevant Environment), MARCO (Mars Cube One) and JPL's experience with spectrometers, including the Moon Mineralogy Mapper (M3). The 6U CubeSat bus will use mostly commercial-off-the-shelf (COTS) components such as the lithium ion batteries, the CPU board, HaWK solar panels produced by MMA Design LLC, star tracker and 3-axis reaction wheels for attitude control. The CPU is a "Rad-Tol Dependable Multiprocessor". JPL will provide the Iris transponder that provides timing, navigation and telecommunication in the X band, which is to be monitored with the NASA Deep Space Network.

The Lunar Flashlight spacecraft was ejected from the Falcon 9 second stage after trans-lunar injection, after which it used a Sun sensor and solar panels to power the 3-axes reaction wheels. It also featured a chemical monopropellant propulsion and orientation system built by the Georgia Tech Space System Design Laboratory. The propulsion system occupied 3U of volume including 2 kg of AF-M315E (ASCENT) monopropellant, a less toxic HAN-based monopropellant being used in lieu of hydrazine. The intricate propellant management unit was fabricated using additive manufacturing.{{cite web|url=http://ssdl.gatech.edu/research/projects/lunar-flashlight-propulsion-system|title=Lunar Flashlight Propulsion System |access-date=23 April 2021}} The propulsion system had four 100 mN thrusters mounted on the base of the spacecraft, fed by miniature electric gear pump.{{Cite conference |last=Smith |first=Celeste |last2=Cheek |first2=Nathan |last3=Burnside |first3=Christopher |last4=Baker |first4=John |last5=Adell |first5=Philippe |last6=Picha |first6=Frank |last7=Kowalkowski |first7=Matthew |last8=Lightsey |first8=E. Glenn |display-authors=3 |date=2023 |title=The Journey Of The Lunar Flashlight Propulsion System From Launch Through End Of Mission |url=https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=5619&context=smallsat |conference=2023 Small Satellite Conference |id=SSC23-VI-03}} Gear pump was developed and built by Flight Works, Inc. company. AF-M315E monopropellant was stored in a low-pressure conformal tank, more compact and lightweight than usual high-pressure tanks for pressure-fed propulsion systems.{{Cite conference |last=Bostwick |first=Christopher M. |last2=Barie |first2=Russell W. |last3=Torres |first3=Jose |last4=Besnard |first4=Eric |last5=Cavender |first5=Daniel |display-authors=3 |date=August 2021 |title=Development and Qualification of Green Propellant Micropump for MicroSat and CubeSat Propulsion Systems |conference=AIAA Propulsion and Energy 2021 Forum |series=AIAA Propulsion and Energy Forum |publisher=AIAA |doi=10.2514/6.2021-3733 |id=AIAA 2021-3733}}

During the first few days of flight (December 2022), it was found that 3 of the 4 thrusters were underperforming. As of January 2023 the mission team was working to remedy the problem.{{cite web|url=https://www.jpl.nasa.gov/news/nasas-lunar-flashlight-team-assessing-spacecrafts-propulsion-system|title=NASA's Lunar Flashlight Team Assessing Spacecraft's Propulsion System|author=JPL/NASA|website=Jet Propulsion Laboratory |access-date=8 February 2023}} Limited success was achieved with the other 3 thrusters by May 2023,[https://www.spacedaily.com/reports/Team_Continues_to_Troubleshoot_Propulsion_for_NASAs_Lunar_Flashlight_999.html Team Continues to Troubleshoot Propulsion for NASA's Lunar Flashlight 9 May 2023] but the final effort to recover thrust by running the propellant pump at high speed has probably ruprured a feed line, and further attempts were abandoned.{{Cite conference |last= McElrath |first=Timothy P. |last2=Collins |first2=Steven M. |last3=Smith |first3=Celeste R. |last4=Lo |first4=Kevin D. |last5=Cheek |first5=Nathan |last6=Hauge |first6=Michael J. |date=2023 |title=A Delicate Balance of Torque and Thrust: How Lunar Flashlight Used Rotating Maneuvers to Make One Thruster Do the Work of Four |url=https://www-robotics.jpl.nasa.gov/media/documents/ASC-23-260.pdf |conference=AIAA/AAS Astrodynamics Specialist Conference |id=AAS 23-260}}

Possible cause of thrusters underperformance is theorized to be a debris blocking the feed lines between thruster valves and thruster feed tubes. It is suspected that passages in additively manufactured manifold were not cleaned properly from residual metal powder after powder bed fusion process.

The spacecraft was planned to be the second to use a near-rectilinear halo orbit, the first being the CAPSTONE mission.{{cite web|url=https://phys.org/news/2022-11-nasa-lunar-flashlight-smallsat-readies.html|title= NASA's Lunar Flashlight SmallSat readies for launch|date= November 28, 2022|author=JPL/NASA}} The original concept proposed a trajectory that would target multiple lunar flybys, and possibly include an Earth gravity assist; it would have been captured into a lunar polar orbit one or two months after launch, depending on the selected trajectory.

{{multiple image

| align = center

| direction = horizontal

| width = 350px

| header = Animation of Lunar Flashlight - An original plan

| image1 = Animation of Lunar Flashlight around Earth.gif

| caption1 = Around the Earth

| image2 = Animation of Lunar Flashlight around Earth - Frame rotating with Moon.gif

| caption2 = Frame rotating with Moon - Viewed from Earth

| footer = {{legend2|Magenta|Lunar Flashlight}}{{·}}{{legend2| RoyalBlue| Earth}}{{·}}{{legend2|Lime| Moon}}

}}

{{Portal|Spaceflight|Solar System}}

• Lunar water
• List of missions to the Moon

;The 10 CubeSats that flew in the Artemis 1 mission:

• Near-Earth Asteroid Scout by NASA was a solar sail spacecraft that was planned to encounter a near-Earth asteroid (mission failure)
• BioSentinel was an astrobiology mission
• LunIR by Lockheed Martin Space
• Lunar IceCube, by the Morehead State University
• CubeSat for Solar Particles (CuSP)
• Lunar Polar Hydrogen Mapper (LunaH-Map), designed by the Arizona State University
• EQUULEUS, submitted by JAXA and the University of Tokyo
• OMOTENASHI, submitted by JAXA, was a lunar lander (mission failure)
• ArgoMoon, designed by Argotec and coordinated by Italian Space Agency (ASI)
• Team Miles, by Fluid and Reason LLC, Tampa, Florida

;The 3 CubeSat missions that were not loaded onto Artemis 1:

• Lunar Flashlight was planned to map exposed water ice on the Moon (mission failure)
• Cislunar Explorers, Cornell University, Ithaca, New York
• Earth Escape Explorer (CU-E³), University of Colorado Boulder

{{Reflist|30em}}

• {{Cite journal |last=Cohen |first=Barbara A. |last2=Hayne |first2=Paul O. |last3=Greenhagen |first3=Benjamin |last4=Paige |first4=David A. |last5=Seybold |first5=Calina |last6=Baker |first6=John |date=March 2020 |title=Lunar Flashlight: Illuminating the Lunar South Pole |url=https://ieeexplore.ieee.org/document/9076196/ |journal=IEEE Aerospace and Electronic Systems Magazine |volume=35 |issue=3 |pages=46–52 |doi=10.1109/MAES.2019.2950746 |issn=0885-8985|hdl=2060/20160003700 |hdl-access=free }}
• {{Cite journal |last=Krause |first=Michael |last2=Thrasher |first2=Ava |last3=Soni |first3=Priyal |last4=Smego |first4=Liam |last5=Isaac |first5=Reuben |last6=Nolan |first6=Jennifer |last7=Pledger |first7=Micah |last8=Lightsey |first8=E. Glenn |last9=Ready |first9=W. Jud |last10=Christian |first10=John |date=July 2024 |title=LONEStar: The Lunar Flashlight Optical Navigation Experiment |url=https://link.springer.com/10.1007/s40295-024-00452-9 |journal=The Journal of the Astronautical Sciences |doi-access=free |volume=71 |issue=4 |doi=10.1007/s40295-024-00452-9 |issn=2195-0571 |pmc=11249573 |pmid=39021366}}

{{Moon spacecraft}}

{{Orbital launches in 2022}}

Category:CubeSats

Category:Missions to the Moon

Category:Space probes launched in 2022

Category:2022 in the United States

Category:NASA space probes

Category:Secondary payloads