Differences between Gaia DR2 and Gaia EDR3 photometry: demonstration, consequences, and applications
Abstract
We produce a new photometric calibration for the combined six-filter system formed by Gaia DR2 + EDR3 G+G BP+G RP using an improved STIS/HST spectrophotometric library with very red stars. The comparison between observed and synthetic photometry yields residual dispersions of just 3.4-8.7 mmag, resulting in the most accurate and precise whole-sky large-dynamic-range optical photometric system ever obtained. We include some tests and applications.
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