G6IV JM53, MK73, Houk88, and Keenan89 do not list a G6IV standard. GrayNstars lists 59 Ari (HD 20618) as a G6IV standard (no parentheses). Among Gray03 and Gray06 stars within 40 pc (only HIP 110843, 24526, 74653): B-V(G6IV) = 0.739 (+- 0.005 sem, +- 0.009 stdev; N=3) V-I(G6IV) = 0.787 (+- 0.003 sem, +- 0.006 stdev; N=3) (B-V)(G6IV) = 0.78 ; HD 146059 (plx=14.10,Vmag=6.41) (B-V)(G6IV) = 0.793 ; poly fit to FGK subgiant standards & exemplars => adopt (B-V)(G6IV) = 0.79 [updated 1/28/2022] Mv(G6IV) = 2.16 ; HD 146059 (plx=14.10,VMag=6.41) Mv(G6IV) = 3.09 ; quadratic trend G0IV-K2IV standards+exemplars (for G6IV) Mv(G6IV) = 3.2 ; GrayCorbally09 Mv(G6IV) = 3.929 ; HD 128428 (plx= 16.75,Vmag=7.809) Mv(G6IV) = 4.137 ; HD 9847 (plx= 24.75,Vmag=7.17) Mv(G6IV) = 4.220 ; HD 146050 (plx= 18.12,Vmag=7.93) => adopt Mv(G6IV) = 3.09 mag [adopt 1/28/2022] Note that Mv(G6V)=5.1, so many of the Mv~5 stars are probably dwarfs misclassified as subgiants. # Deprecated Standard HD 20618 = HR 995 = 59 Ari *G7IV: Keenan89(stan) G6IV: GrayNstars G8IV: Jaschek78(Harlan69) G5IV: Adams35 G5: Cannon GrayNstars website lists 59 Ari as "G6IV" standard, however no one else has classified the star as this subtype. Not a great string of use, but best available. No PASTEL Teffs or [Fe/H]. Parallax=15.88mas(63 pc; should be unreddened). B-V=0.860+-0.015(HIP), V-I=0.88+-0.04(HIP), saturated in 2MASS. # Other Stars HD 146059 = HIP 79787 G5V: Evans61 G5III: Drilling68 G6IV: Houk75 G8: 1969ArA.....5..231L Binary 0.518"(HIP), delta(Hp)=1.72+-0.02(HIP). Parallax poorly constrained. V=6.40(HIP), B-V=0.793+-0.004(HIP), V-I=0.86(HIP). plx=14.10+-0.96mas(HIP2), plx=7.6699+-1.1148mas(GaiaDR2), plx=6.0275+-0.6269mas(GaiaEDR3).