G4III Best southernly accessable standard is HR 4255 (J1054-1345) Keenan89 standards: HR 1327 (=HD 27022) - G4III HR 4255 (=HD 94481) - G4III-IIIb GrayNstars standard: HR 4255 (=HD 94481) - G4III (J-H)(G4III) = 0.427 ; smoothed relation from giants in Skiff compendium w/i 15 deg of NGP, 2MASS photometry AAA flags => adopt (J-H)(G4III) = 0.427 [updated 10/30/2020] (H-Ks)(G4III) = 0.095 ; smoothed relation from giants in Skiff compendium w/i 15 deg of NGP, 2MASS photometry AAA flags => adopt (H-Ks)(G4III) = 0.095 [updated 10/30/2020] # No standard MK43, JM53, Houk, and GrayCorbally10 do not list a G4III standard None of Gray's papers have any stars classified as "G4III". # Primary standard HR 1327 = HD 27022 (J0420+6508; V=5.3) *G4III: Keenan89(stan) G5III: JM53,Roman52(lines weak) G4/5III: Ginestat94 G2III: Roman49 G3III: Adams35 Adopt "G4III" from Keenan89, but quite a bit of variation in the literature. # Secondary standard HR 4742 = HD 108477 (J1227-1637; V=6.3) *G4III: Adams35,Keenan89(non-stan) G3III: Keenan83,GrayCorbally10 G5II: Houk88 Adopt "G4III" from Keenan89. G3III standard in Keenan83, but not Keenan89. # Variant standard HR 4255 = HD 94481 (J1054-1345; V=5.6) *G4III-IIIb: Keenan89 G4III: Adams35,GrayNstars K0III+(G): Houk88 G0: Cannon Adopt "G4III-IIIb" from Keenan89. # Non-standard HD 108477 (J1227-1637; V=6.4) G4III: Keenan89(non-standard) HD 127243 (J1428+4950; V=5.6) G4III-IV Fe-1: Keenan89(non-standard)