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Gaia Photometric Catalogue: the calibration of the DR2 photometry

Published online by Cambridge University Press:  03 March 2020

D. W. Evans ,
M. Riello ,
F. De Angeli ,
J. M. Carrasco ,
P. Montegriffo ,
C. Fabricius ,
C. Jordi ,
L. Palaversa ,
C. Diener  and
G. Busso
...Show all authors
D. W. Evans
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Road, CambridgeCB3 0HA, UK
M. Riello
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Road, CambridgeCB3 0HA, UK
F. De Angeli
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Road, CambridgeCB3 0HA, UK
J. M. Carrasco
Affiliation:
Institut de Ciències del Cosmos, Universitat de Barcelona (IEEC-UB), Martí Franquès 1, 08028Barcelona, Spain
P. Montegriffo
Affiliation:
INAF–Osservatorio Astronomico di Bologna, via Ranzani 1, 40127Bologna, Italy
C. Fabricius
Affiliation:
Institut de Ciències del Cosmos, Universitat de Barcelona (IEEC-UB), Martí Franquès 1, 08028Barcelona, Spain
C. Jordi
Affiliation:
Institut de Ciències del Cosmos, Universitat de Barcelona (IEEC-UB), Martí Franquès 1, 08028Barcelona, Spain
L. Palaversa
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Road, CambridgeCB3 0HA, UK
C. Diener
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Road, CambridgeCB3 0HA, UK
G. Busso
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Road, CambridgeCB3 0HA, UK
C. Cacciari
Affiliation:
INAF–Osservatorio Astronomico di Bologna, via Ranzani 1, 40127Bologna, Italy
E. Pancino
Affiliation:
INAF - Osservatorio Astronofisico di Arcetri, Largo Enrico Fermi 5, 50125, Firenze, Italy email: dwe@ast.cam.ac.uk
F. van Leeuwen
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Road, CambridgeCB3 0HA, UK
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Abstract

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Gaia DR2 was released in April 2018 and contains a photometric catalogue of more than 1 billion sources. This release contains colour information in the form of integrated BP and RP photometry in addition to the latest G-band photometry. The level of uncertainty can be as good as 2 mmag with some residual systematics at the 10 mmag level. The addition of colour information greatly enhances the value of the photometric data for the scientific community. A high level overview of the photometric processing, with a focus on the improvements with respect to Gaia DR1, was given. The definition of the Gaia photometric system, a crucial part of the calibration of the photometry, was also explained. Finally, some of the photometric improvements expected for the next data release were described.

Keywords

CataloguesSurveysTechniques: photometric

References

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