Northern Virginia is a lovely place, but back to the stars. I am resuming work on the interpolation object. It will let me interpolate basic star data (remember the datum we need most is mass) from the Spectral and luminosity classes, and also interpolate spectral type from data like color index and luminosity. And give any "made up" data a shot of verisimilitude.
The initial HYG dataset contains 111168 apparently single stars; of these I have complete spectral and luminosity data for 54611. This is going to be a slog!