Gaia Data Release 3: External calibration of BP/RP low-resolution spectroscopic data

Understand

Context.

• Gaia Data Release 3 contains astrometry and photometry results for about 1.8 billion sources based on observations collected by the European Space Agency (ESA) Gaia satellite during the first 34 months of its operational phase (the same period covered Gaia early Data Release 3; Gaia EDR3).
• Low-resolution spectra for 220 million sources are one of the important new data products included in this release.
• Aims.