skip to main content

gaia data release 3 documentation

3.4 Processing steps

3.4.12 Spectro-Photometric Image Parameters determination

Author(s): Anthony Brown

Although the BP and RP data are treated from scratch again in the photometric processing (see Chapter 5), a pre-processing of these data within IDT is needed in order to derive instantaneous source colour information (which may differ from the mean source colour). These source colours are needed in the determination of the daily astrometric image parameters whereas in the cyclic processing, IDU retrieves the colour from the catalogue (Section 3.4.11).

The photometric pre-processing is described in detail in Sections 5.3 and 5.4 of Fabricius et al. (2016).