Climate Absolute Radiance and Refractivity Observatory Pathfinder

Unparalleled accuracy to understand our changing climate

CLARREO Pathfinder mission patch

The Climate Absolute Radiance and Refractivity Observatory Pathfinder (CLARREO-PF) is an instrument payload that will measure reflected solar radiation at an unprecedented level of accuracy. CLARREO-PF data will do this by taking highly accurate measurements of sunlight reflected by Earth and the Moon. These measurements, anchored to international standards, will be five to ten times more accurate than those from existing sensors. The high accuracy in the measurements makes it possible to detect Earth’s subtle climate change trends decades sooner, and provides the knowledge needed to make informed decisions in response.

Mission Class:


Mission Status:


LASP Roles:

Research, Instruments, Data, Engineering

Science Target:

Earth's Atmosphere

Mission Focus:

Climate, Earth's Atmosphere, Solar Irradiance
CLARREO Pathfinder mission patch

Launch Date: scheduled for 2023
Prime Mission: 2 years

Lead Institution: NASA Langley Research Center

Lead Funding Agency: NASA Earth Science Division

Partners: NASA Johnson Space Center / International Space Station (ISS), NASA Goddard Space Flight Center, NASA Kennedy Space Center, NASA Marshall Space Flight Center, National Institute for Standards and Technology (NIST), Teledyne Scientific Imaging, Inc., Zeiss, Inc., Moog, Inc., Northrop Grumman Aerospace Systems, Iris Technology, Inc., Technical University of Denmark