Information on resource 'Astrophysical parameters from Gaia DR2, 2MASS and AllWise'

We estimated the stellar astrophysical parameters of 120 million stars over the entire sky that have Gaia parallax and photometry from Gaia DR2, 2MASS, and AllWISE. We provide estimates of log age, log mass, log temperature, log luminosity, log surface gravity, distance modulus, dust extinction (A0), and average grain size (R0) along the lines of sight. In contrast with other catalogs, we do not use a Galactic model as prior but weakly informative ones. Our estimate and uncertainties are quantiles, so they are invariant under monotonic transformations (e.g., log, exp). This means that one can use our median estimate to obtain the median distance or temperature, for instance, and likewise for the uncertainties.

The full dataset is available in VAEX-style HDF5, suited in particular for visualisation-intensive all-sky analyses. This dump is about 100 gigabytes in size: http://dc.zah.uni-heidelberg.de/gdr2ap/q/download.

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