The ALTAIR project provides a precision [0(0.1%) uncertainty] photometric reference calibration using in-situ-calibrated light sources above the atmosphere, in the optical and microwave spectra.
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ALTAIR will provide the means to eliminate the largest uncertainty in measurements of dark energy using supernovae, and (via an onboard precisely-polarized microwave source) a major uncertainty in the search for gravitational waves in the CMB, and additionally provides key information on atmospheric science.
Our partner project, ORCASat, will be launching a CubeSat "version" of the optical source of ALTAIR into low Earth orbit in 2022! (ALTAIR itself will be simultaneously continuing with calibration flights using high-altitude balloons; the two techniques are quite different and complementary!)
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