B6V

Garrison94 does not list a B6V anchor standard, and MK73 does not list
a B6V dagger standard. MK73 lists 19 Tau as a B6IV dagger standard.

JM53 standards:       19 Tau & 30 Sex - B6V
Garrison67 standard:  19 Tau - B6V
Lesh68 standard:     bet Sex - B6V
Cowley69 standard:    19 Tau - B6V
Houk75 standard:     HR 2360 - B6V (secondary standard - adopted from Hiltner69)

# No standard
Houk doesn't list a B6V pri. standard, but a secondary one (HD 45796 = HR 2360).

MK43, Hiltner69, Cowley72, MK73, Garrison77, MK78, Garrison79, Keenan85, 
GrayAtlas, & GrayNstars do not list B6V standard.

Skiff08 did not flag any B6V stars as standards. 

Although Garrison77 does not list a B6V standard, they classify 3 stars as
B6V.  The brightest are HD 152909 (V=6.6; B6V) and HD 112999 (V=7.4;
B6V).

For 2 primary standards:
<B-V>(B6V) = -0.135 (+-0.003 sem, +-0.010 stdev; N=2 standards)
<U-B>(B6V) = -0.472 (+-0.013 sem, +-0.037 stdev; N=2 standards)

# Primary Standards
HD 90994 = 30 Sex = bet Sex = HR 4119
  B6V: JM53(stan),Jaschek64(most),Kennedy83(Lesh68(stan))
  B5: Cannon
  B5IV/V: Houk99
  Most recent classification is Lesh68
  V=5.071, B-V=-0.139, U=B=-0.504 (Mermilliod91) 
  QBV: (B-V)o=-0.142, (U-B)o=-0.499, E(B-V)= 0.003

HD 45796 = HR 2360 
  B6V: Jaschek78(Hiltner69),Houk(sec.standard),Houk75,Kennedy83(Hiltner69)
  B5: Cannon
  At least Hiltner69 & Houk agree on B6V type. 
  V=6.262, B-V=-0.141, U-B=-0.460 (Mermilliod 1991)
  QBV: (B-V)o=-0.128, (U-B)o=-0.446, E(B-V)=-0.013

# Weak Standard
HD 23338 = HR 1145 = 19 Tau = HIP 17531 = Taygeta (a Pleiad)
  B6V: JM53(stan),Mendoza56,Cowley69(stan),Jaschek78(Herbig55)
  B6IV: Kennedy83(all),MK73(dagger),Lesh68
  B5: Cannon
  Skiff09 comments that Cannon18 uses Taygeta as B5 standard for HD types!
  Skiff09 lists no published types after MK73. 
  (B-V)o=-0.15, V=4.30 => Mv=-1.3. From my eye the Pleiades "turnoff" is at V=3.8.
  Taygete is the bluest MS B-star, just fainter than the terminal MS (but still "MS")
  But best considered "B6IV" due to MK73?

# Other Stars
Gray01/03/06 lists one B6V star: HIP 109268 (=HD 209952, alf Gru), but all of
its other published types are B5V and B7IV.