K7.5V No good standard. Keenan83 standard: Gl 638 (=HD 151288) - K7.5Ve Keenan85 standard: Gl 638 (=HD 151288) - K7.5Ve Keenan88 standard: Gl 638 (=HD 151288) - K7.5Ve Keenan89 standard: Gl 638 (=HD 151288) - K7.5Ve (K7.5V) = 2.89 (+-0.16 stdev) ; Lepine12 Teff(K7.5V) = 3883+-82 K ; Lepine12 Note that Lepine12 does not contain subtypes between K7.5V and M0V. # Deprecated Standard GJ 638 = HD 151288 = Cin 18 2238 K5: Cannon,Bidelman85,Hawley97 K6V: Morgan38 *K7V: JM53(non-stan),Wilson62,Jaschek78,Stephenson86,Gray03,Kirkpatrick(unpub.,DwarfArchive) K7.5Ve: Keenan83,Keenan85,Keenan88,Keenan89(stan) M0V: Adams26 M0.5V: Joy74 M1: Lee47 Keenan called it K7.5V, so one might suppose this is halfway between K7V and M0V since he didn't use K8 or K9 subtypes.