G5IV

Garrison94 lists mu Her as the G5IV anchor standard.

MK43 standard:        70 Vir - G5IV-V
     		      mu Her (=HD 161797) - G5IV 
JM53 standard:	      mu Her (=HD 161797) - G5IV
MK73 dagger standard: mu Her (=HD 161797) - G5IV
Keenan89 standard:    mu Her (=HD 161797) - G5IV
		      ome Sgr (=HD 188376) - G5IV
Houk88 standard:      mu Her (=HR 6623 = HD 161797) - G5IV [from MK73]
Garrison94 anchor:    mu Her (=HR 6623 = HD 161797) - G5IV
GrayNstars standard:  ome Sgr (=HD 188376) - G5IV
		      mu Her - G5IV

Among Gray03 and Gray06 stars within 40 pc (only HIP 42430 & 98066):
B-V(G5IV) = 0.734 (+- 0.014 sem, +- 0.020 stdev; N=2)
V-I(G5IV) = 0.760 (+- 0.030 sem, +- 0.042 stdev; N=2)

(B-V)(G5IV) = 0.750 ; pri. stan. HD 161797 = mu Her
(B-V)(G5IV) = 0.757 ; sec. stan. HD 188376 = ome Sgr
(B-V)(G5IV) = 0.774 ; poly fit to FGK subgiant standards & exemplars
=> adopt (B-V)(G5IV) = 0.76 [updated 1/28/2022]

G5IV stars w/i 60pc in SIMBAD (using SIMBAD plx, spt):
Mv(G5IV) = 2.853 ; sec. stan. * ome Sgr (plx =  42.72 mas,V= 4.70)             
Mv(G5IV) =  2.993 ; HD 164507 (plx =  22.01 mas,V= 6.28)
Mv(G5IV) = 3.09  ; quadratic trend G0IV-K2IV standards+exemplars (for G5IV)
Mv(G5IV) = 3.2   ; GrayCorbally09 
Mv(G5IV) =  3.775 ; HD 26729  (plx =  18.50 mas,V= 7.44)               
Mv(G5IV) = 3.821 ; pri. stan. * mu. Her (plx = 120.33 mas,V= 3.42)               
Mv(G5IV) =  3.955 ; HD 225155 (plx =  18.33 mas,V= 7.64)
=> adopt Mv(G5IV) = 3.09 mag [adopted 1/28/2022]

Note that Sandage16 limits subgiants to a box in absolute mag space for G0-K2
and 1.6 < Mv < 3.4, but mu Her (Mv=3.82) has been considered subgiant since 1930s
and Garrison94 considers it an anchor standard. 

Teff(G5IV) = 5530 K ; pri. stan. mu Her
Teff(G5IV) = 5524 K ; sec. stan. ome Sgr
=> adopt Teff(G5IV) = 5530 K [updated 11/20/2019]

# Primary Standards

HD 161797 = mu Her = HR 6623 = HIP 86974 (J1636+4244, V=3.4)
  G4IV/V: Adams35
 *G5IV: Keenan41,MK43,Roman52(lines weak),Keenan53(G5V+),Keenan89,Garrison94(anchor),Gray01,GrayNstars,Cannon(G5),Jaschek64(most)
  G5.5V: Morgan38
  G8III: 1897AnHar..28....1M

  One of only four subgiant (IV) anchor standards (Garrison94): eta
  Boo (G0IV), mu Her (G5IV), bet Aql (G8IV), gam Cep (K1IV).
  Sandage16 mentions mu Her as one of the "six extreme subgiants with
  large trigonometric parallaxes... could be said to define a subgiant
  sequence". Has a 35" companion which itself is binary (BC:
  M4V,V=9.8).  V=3.42(HIP), B-V=0.750+-0.015(HIP),
  V-Ic=0.71+-0.02(HIP).  plx=119.9248+-0.1543mas(GaiaEDR3) => Mv=3.82.
  PASTEL values: <Teff> = 5529K(N=22), <[Fe/H]>=0.24(N=20),
  <logg>=3.975(N=22).

# Secondary Standard

HD 188376 = ome Sgr = HR 7597 = HIP 98066 (J1955-2617,V=4.7)
  G3/5III: Houk82(#1)
  G4IV: 1937AnHar.105...45H
 *G5IV: Keenan89,Gray06
  G5: Cannon
  G5V: Adams35
  G6/8III+G: Houk82(#2)
  G8: Bidelman85
  K0V: 1966ArA.....3..501L
  
  Houk82 notes; "HR 7597; *OMEGA SGR; OR POSSIBLY COMPOSITE G6/8 III +
  EARLY G". V=4.70(HIP), B-V=0.748+-0.015(HIP),
  B-V=0.757+-0.004(Mermilliod91), V-I=0.79(HIP).
  plx=42.7159+-0.5538mas(GaiaDR2) => Mv=2.85.  PASTEL compendium:
  <Teff> = 5524K(N=6), <logg>=3.82(N=4), <[Fe/H]>=0.025(N=4).

# Other stars

HD 143120
  G5IV: Evans59,Houk78
  G7IV: Lu83

HD 157347
  G3V: Gray03 
  G5V: Harlan74
  G5IV: Evans64,Cowley79