G2III 84 Her is the best southernly accessible G2III standard. MK43 standards: eta Peg - G2II-III pi Cep - G2III alf Aur - G2II-III "composite" [G5+F6] Keenan89 standard: 84 Her - G2IIIb GrayNstars standard: 84 Her - G2IIIb (J-H)(G2III) = 0.376 ; smoothed relation from giants in Skiff compendium w/i 15 deg of NGP, 2MASS photometry AAA flags => adopt (J-H)(G2III) = 0.376 [updated 10/30/2020] (H-Ks)(G2III) = 0.089 ; smoothed relation from giants in Skiff compendium w/i 15 deg of NGP, 2MASS photometry AAA flags => adopt (H-Ks)(G2III) = 0.089 [updated 10/30/2020] (B-V)(G2III) = 0.676 ; HIP 75676 G2III 2003AJ....126.2048G => adopt (B-V)(G2III) = 0.68 [updated 10/30/2020] Mv(G2III) = 4.95 ; HIP 75676 G2III 2003AJ....126.2048G (only G2III d<50pc, clearly dwarf not giant!) # No standard Houk, JM53, Morgan65, Garrison94, GrayCorbally10 do not list a G2III standard # Primary standard 84 Her = HD 161239 (J1743+2419; V=5.7) *G2IIIb: Keenan89,GrayNstars G2IV: Gray01,Gray03 G6III-IV: Adams35. Adopt "G2IIIb" from Keenan89. Using revised Hipparcos parallax, this star is 2.2 mags above the main sequence (Mv = 2.8; plx = 25.6+-0.3 mas). # Weak standard pi Cep = HR 8819 = HD 218658 (J2307+7523; V=4.5) *F3V+G3III: Edwards76 G2III: MK43, Slettebak55, Stephenson69 G0III: Nassau47 G1III: Adams35 G0IV: Abt81 G5: Cannon Skiff10 notes for Adams35: "SErn of 1" cpm pair". Edwards76 split the binary, so the "G2III" is a composite. Adopt "F3V+G3III" from Edwards76. # Non-standard HR 1023 = HD 21018 (J0323+0452; V=6.4) G2III: CH-1: : Keenan89(non-standard) Skiff10 notes "brighter of 1" pair". HD 138004 (J1527+4252; V=7.5) G2III: Gray03 Only "G2III" in the Gray01/03/06 papers.