G3V

There are no G3V dagger types

Skiff08 flags two stars as G3V standards, all from Keenan89: HD 186427
(G3V) & HD 86728 (G3Va Hdel1).

Corbally86 used the Hyad HD 26736 = vB 15 as their G3V standard. 

Gray01/03/06 list 17 nearby G3V stars. Median HIP colors:
<B-V>(G3V) = 0.667 (+-0.004 sem, +-0.014 stdev; N=17)
<V-I>(G3V) = 0.724 (+-0.007 sem, +-0.020 stdev; N=17)


# No standards
Houk,JM53,Morgan65,MK73,Keenan85 do not list a G3V standard

# standards
HD 10697 = 109 Psc = HR 508
  G3Va: Keenan99
 
HD 186427 = 16_Cyg_B = HR 7504 = GJ 765.1B; B-V[HIP]=0.661+-0.005
  G3V: Gray03,Keenan89,Keenan88
  G2V: Gray01
  G5V: JM53, Wilson62
  G4.5V: Stebbins57
  G2V: Adams35
  certainly not a *dagger*, but at least Keenan and Gray agree
 
# Variant
HD 1461 = HR 72 = BD-08_38 = SAO 128690
  G3V Fe 0.5: Keenan99
  G3V: Gray03
  G0V: Hoffleit91

HD 86728 = HR 3951
  G3VaHdelta1: Keenan88,Keenan89,Keenan99
  G4V: Gray03
  Skiff07 lists 7 refs, ranging from G1V to G5V
  Keenan and Gray don't agree, no Houk type
  B-V[HIP]=0.676+-0.004

# check
HD 26736 = Cl Melotte 25 15 = HIP 19793 
  G0V: Corbally86(stan,Morgan65)

Mean B-V for G3V is 0.641