Gaia Data Release 2
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Table A.1

Range of applicability for the relationships found here between Gaia passbands and other photometric systems.

HIPPARCOS relationships
GHP = f(BV) − 0.2 < BV < 1.5
GHP = f(VI) − 0.3 < VI < 3.0
GHP = f(GBPGRP) − 0.5 < GBPGRP < 4.0
GBPHP = f(VI) 0.0 < VI < 2.5
GRPHP = f(VI) − 0.3 < VI < 2.5
GBPGRP = f(VI) − 0.4 < VI < 2.5

Tycho-2 relationships
GVT = f(BTVT) − 0.1 < BTVT < 2.0
GVT = f(GBPGRP) − 0.3 < GBPGRP < 4.0
GBT = f(GBPGRP) 0.0 < GBPGRP < 2.5
GBPVT = f(BTVT) − 0.2 < BTVT < 2.5
GRPVT = f(BTVT) − 0.2 < BTVT < 2.0
GBPGRP = f(BTVT) − 0.2 < BTVT < 2.0

SDSS relationships
Gg = f(gi) − 1.0 < gi < 4.0
Gg = f(gr) − 0.6 < gr < 1.5
Gr = f(ri) − 0.5 < ri < 2.0
Gi = f(ri) − 0.2 < ri < 1.8
GBPr = f(ri) − 0.1 < ri < 0.9
GRPr = f(ri) − 0.4 < ri < 1.0
GBPGRP = f(ri) − 0.4 < ri < 0.8
Gr = f(GBPGRP) 0.2 < GBPGRP < 2.7
Gi = f(GBPGRP) 0.0 < GBPGRP < 4.5
Gg = f(GBPGRP) − 0.5 < GBPGRP < 2.0

Johnson-Cousins relationships
GV = f(VI) − 0.3 < VI < 2.7
GBPV = f(VI) − 0.3 < VI < 2.7
GRPV = f(VI) − 0.3 < VI < 2.7
GBPGRP = f(VI) − 0.3 < VI < 2.7
GV = f(VR) − 0.15 < VR < 1.4
GV = f(BV) − 0.3 < BV < 2.4
GV = f(GBPGRP) − 0.5 < GBPGRP < 2.75
GR = f(GBPGRP) − 0.5 < GBPGRP < 2.75
GI = f(GBPGRP) − 0.5 < GBPGRP < 2.75

2MASS relationships
GKS = f(HKS) − 0.1 < HKS < 0.7
GBPKS = f(HKS) − 0.1 < HKS < 0.6
GRPKS = f(HKS) − 0.1 < HKS < 0.7
GBPGRP = f(HKS) − 0.1 < HKS < 0.55
GKS = f(GBPGRP) 0.25 < GBPGRP < 5.5
GH = f(GBPGRP) 0.25 < GBPGRP < 5.0
GJ = f(GBPGRP) − 0.5 < GBPGRP < 5.5

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