FF1III # No standard GrayGarrison89 do list any F1 standards of any luminosity class. The only "pure" F1III star classified by GrayGarrison89 is HD 159532 (J1737-4259; V=1.9). MK43, JM53, Cowley69, Houk, MorganAbt72, MK78, GrayNstars, and GrayCorbally10 do not list F1III standards. (J-H)(F1III) = 0.111 ; smoothed relation from giants in Skiff compendium w/i 15 deg of NGP, 2MASS photometry AAA flags => adopt (J-H)(F1III) = 0.111 [updated 10/30/2020] (H-Ks)(F1III) = 0.061 ; smoothed relation from giants in Skiff compendium w/i 15 deg of NGP, 2MASS photometry AAA flags => adopt (H-Ks)(F1III) = 0.061 [updated 10/30/2020]