G1IV MK73 lists zet Her (HR 6212 = HD 150680) as a G1IV dagger standard. JM53 does not list a G1IV standard. Keenan89 does not list any "pure" G1IV standards, but the closest is the non-standard HD 67228 (G1IVb), along with a plethora of variants: HD 9729 (G1IV:), HD 34411 (G1.5IV-V Fe-1; standard), HD 81809, HD 89010 (G1.5IV-V standard), and HD 205905 (all G1.5IV-V). Houk88 lists zet Her as a G1IV standard according to MK73, but adopt G3IV for this star. The star is a 1.5" binary, and has been considered a G0IV standard elsewhere. Gray03 lists one G1IV star (HIP 88945) and Gray06 lists one also (HIP 107095 = 42 Cap = HD 206301), plus some IV-V variants. Among Gray03 and Gray06 stars within 40 pc: B-V(G1IV) = 0.653 (+-0.020 sem, +-0.028 stdev; N=2) V-I(G1IV) = 0.715 (+-0.015 sem, +-0.021 stdev; N=2) (B-V)(G1V) = 0.642 ; exemplar mu Cnc = HD 67228 (B-V)(G1V) = 0.651 ; poly fit to FGK subgiant standards & exemplars => adopt (B-V)(G1V) = 0.65 [updated 1/28/2022] Mv(G1IV) = 2.9 ; GrayCorbally09 Mv(G1IV) = 2.95 ; quadratic trend G0IV-K2IV standards+exemplars (for G1IV) Mv(G1IV) = 3.434 ; exemplar G1IVb mu Cnc = HD 67228 Mv(G1IV) = 3.46 ; exemplar G1IV bet Hyi = HD 2151 => Mv(G1IV) = 2.95 [updated 1/28/2022] Teff(G1IV) = 5766 K ; deprecated stan. zet Her Teff(G1IV) = 5790 K ; halfway between G0IV (5950K) & G2IV (5620K) Teffs Teff(G1IV) = 5824 K ; exemplar mu Cnc = HD 67228 Teff(G1IV) = 5848 K ; exemplar bet Hyi => adopt Teff(G1IV) = 5790 K [last updated 7/15/2017] # Deprecated Standard zet Her = HD 150680 = HR 6212 *G0IV: Maury1897,MK43,Stephenson69,Barry70(G0IVb,uv metals weak),Keenan80,Keenan89(stan), G0: Bidelman85 G0V: Adams35 G2IV: Gray01 G1IV: MK73(dagger),Abt81(standard) G3IV: Houk88(lists as G1IV standard, but calls G3IV) F9IV+G7V: Edwards76 1.5" binary. This star is what gives spectral types a bad name. Struve54 calls companion K0V. PASTEL lists 15 published Teff values: = 5766 K. 11 published [Fe/H] values: <[Fe/H]> = 0.01. # Exemplars bet Hyi = HD 2151 = HR 98 = HIP 2021 F9V: Gray89 G0: Cannon18(HD standard) G0V: Gray06 *G1IV: 1937AnHar.105...45H,Woods55,Houk75(Garrison) G2IV: Evans57 Appears to be slightly metal poor, definitely evolved with most authors publishing logg ~ 4.0. B-V=2.82(HIP), B-V=0.618+-0.008(HIP), V-I=0.68+-0.02(HIP). plx=134.07+-0.11(HIP2) => Mv=3.457 (1.13 mag above MS). PASTEL compendium: = 5848K(N=26), =3.997(N=21), [Fe/H]=-0.125(N=22). Best: Jofre14: Teff=5873+-45K, logg=3.98+-0.02, [Fe/H]=-0.04+-0.01. Ramirez13: Teff=5819+-54K, logg=3.95+-0.02, [Fe/H]=-0.13+-0.05. VOSA v7.0 SED fitting with Av=0 and logg=4.0: BT-Settl-AGSS2009 model Teff=5900K, Lum=3.473+-0.052Lsun, logL=+0.5407+-0.0065, [M/H]=+0.5. mu Cnc = HD 67228 = mu02 Cnc = HR 3176 = HIP 39780 = 10 Cnc *G1IVb: Keenan80,Keenan89 G2IV: MK43,Gray03 G2IV-V: Harlan69 G3V: Adams35 V=5.30(HIP), B-V=0.642+-0.005(HIP), V-I=0.71+-0.00(HIP). plx=41.9916+-0.0841mas(GaiaEDR3) => Mv=3.416. PASTEL: =5824K(N=18), =3.97(N=12), <[Fe/H]>=+0.14(N=13).