Lunar Reconnaissance Orbiter
LRO is a long-running lunar orbiter mapping the Moon at high resolution and measuring topography, temperature, illumination, radiation and surface composition.
The mission in three questions
- Where are safe and scientifically valuable landing regions?
- How cold and dark are polar cold traps, and where is hydrogen enhanced?
- How does the lunar surface change under ongoing impacts and geologic processes?
- What gravity, topography and illumination information is needed for sustained exploration?
Mission purpose and context
The Lunar Reconnaissance Orbiter is a long-lived NASA mapping mission that has become part of the basic infrastructure of modern lunar science. Its high-resolution imaging, topography and thermal datasets support both scientific research and landing-site assessment.
Spacecraft and mission architecture
LRO carries the LROC camera system, LOLA laser altimeter, Diviner radiometer, LEND neutron detector and other instruments. Together they measure surface morphology, elevation, illumination, temperature, radiation-related conditions and indicators relevant to hydrogen distribution.
Payload and measurement highlights
- LROC provides high-resolution narrow-angle imaging and wide-angle context mapping.
- LOLA measures topography and supports precise geodesy and illumination analysis.
- Diviner maps thermal emission and extreme polar temperatures.
- LEND measures neutron flux related to near-surface hydrogen; Mini-RF supplies radar observations.
- CRaTER measures the lunar radiation environment, while LAMP observes in ultraviolet wavelengths.
How this mission collected evidence
| Instrument | Measurement | Scientific connection |
|---|---|---|
| LROC Lunar Reconnaissance Orbiter Camera | High-resolution and wide-angle surface imagery | Landing-site mapping, geology, surface change and exploration planning |
| LOLA Lunar Orbiter Laser Altimeter | Surface elevation and topography | Global shape, slopes, illumination modelling and landing-site analysis |
| Diviner Diviner Lunar Radiometer Experiment | Surface temperature and thermal emission | Thermal environment and polar cold traps |
| LEND Lunar Exploration Neutron Detector | Neutron flux related to hydrogen abundance | Polar hydrogen and volatile studies |
| LAMP Lyman Alpha Mapping Project | Far-ultraviolet reflectance and exospheric emissions | Permanently shadowed regions and lunar exosphere |
| Mini-RF Miniature Radio Frequency | Radar backscatter and surface properties | Polar terrain and candidate ice-related radar signatures |
Browse the lunar mission instrument reference.
Flight and surface operations
Launched in June 2009, LRO entered polar lunar orbit and has continued operating through multiple extended missions. Repeated observations allow scientists to compare illumination, monitor new impact craters and refine maps as operational priorities evolve.
Mission sequence
- 18 June 2009: launched with LCROSS and entered a polar lunar orbit.
- Completed its original exploration-focused mapping phase and continued through extended science missions.
- Repeated observations now provide long-baseline datasets for surface change, illumination and landing-site analysis.
Science and measurements
LROC has imaged the surface at metre and sub-metre scales in selected modes, LOLA built precise topographic models, and Diviner mapped extreme thermal environments including very cold polar terrain. The combined datasets are heavily used for south-polar illumination and landing studies.
What changed because of this mission
LRO connects exploration planning with fundamental science. Its archive supports mission design, geology, polar volatile studies, crater chronology and change detection, making it one of the most broadly used lunar datasets ever produced.
Mission outcome
Its datasets underpin modern landing-site analysis, polar science, lunar cartography and studies of surface change.
The outcome should be read against the mission's actual objectives and architecture. Multi-element missions can have different results for an orbiter, lander, rover or sample-return stage, while a shortened mission can still return important science or demonstrate a critical technology.
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Primary reference
NASA Science - Lunar Reconnaissance Orbiter. LRO mission, instruments, lunar mapping, temperatures and polar volatile investigations.