In a great victory, Jessica Birky (UCSD) has used The Cannon to put internally consistent labels on more than 10,000 M-type dwarf stars observed in (both) the SDSS-IV APOGEE and Gaia surveys. Her labels are based on a data-driven model of spectra, but they correlate beautifully with the Gaia photometry and astrometry, and they do a good job of predicting photometric measures of temperature. The spectral model is also remarkable: Using only two parameters (effective temperature and a mean composition) the model explains a typical 8000-pixel APOGEE spectrum to percent-level accuracy. So I am pretty happy. This has implications for TESS too. We spent time late in the day writing the paper.
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