Table 1
Coefficients of the colour-colour polynomial transformations between Gaia and Tycho-2, Johnson-Cousins and SDSS photometric systems.
| (BT−VT) | (BT−VT)2 | (BT−VT)3 | σ | Applicability range | Tycho-2 | ||
| G−VT | 0.0079363 | –0.4235 | 0.10048 | –0.070742 | 0.066 | −0.2 <BT−VT< 2.0 | (Høg et al. 2000) |
|
|
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| (V−I) | (V−I)2 | (V−I)3 | σ | Johnson-Cousins | |||
| G−V | 0.02266 | –0.27125 | –0.11207 | 0.028 | −0.25 <V−I< 3.25 | (Bessell & Murphy 2012) | |
|
|
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| (g−i) | (g−i)2 | (g−i)3 | σ | SDSS | |||
| G−g | –0.098958 | –0.6758 | –0.043274 | 0.0039908 | 0.028 | −0.4 <g−i< 3.0 | (Ahn et al. 2014) |
Notes. An indication of the range of applicability of these relations is given in the 7th column. Additional details on the source selection criteria for the definition of the empirical relations are available in the online documentation.
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