F5V 

Garrison94 does not list an F5V anchor standard, but MK73 lists
HD 27524 as the F5V dagger standard. 

HD 27534, HD 134083, and HD 210027 are also excellent standards. 

To confuse matters, both HD 27524 and HD 27534 are F5V standards!

MK43 standard:         iot Peg - F5V
JM53 standards:        iot Peg - F5V 
     		       45 Boo - F5V
Abt68 standard:        45 Boo (= HD 134083) - F5V
Garrison72 standards:  iot Peg - F5V
MK73 standard:         HD 27524 - F5V (dagger standard)
MorganAbt73 standards: HD 27524 (= vB 35) - F5V
	    	       HD 27534 (= vB 36) - F5V
Cowley74 standards:    iot Peg - F5V
	 	       45 Boo - F5V 
Houk75 standard:       45 Boo - F5V (primary standard)
Cowley76 standards:    iot Peg - F5V 
MK78 standard:         HD 27534 - F5V
     		       alf CMi (Procyon) - F5IV-V 
Keenan85 standard      HD 27534 - F5V 
Corbally86 standard:   HD 27524 (Cl Melotte 25 35 = vB 35) - F5V (from Morgan65)
Gray89 standard:       HD 27524 - F5V 
GrayAtlas standard:    HD 27524 - F5V
GrayNstars standard:   HD 27524 - F5V
	   	       45 Boo (=HR 5634) - F5V
		       alf CMi (Procyon) - F5V-IV

Skiff08 flags two stars as F5V MK standards: HD 27524 (MK73) & HD 27534 (MK78)

Houk/Michigan classifications: Houk's Michigan Spectral Survey
catalogues classify 4738 stars as "F5V". Among these, 48 were later
classified by Gray and collaborators (2001, 2003, 2006) using the MK78
standards (see also Gray 1989). The 48 Houk "F5V" stars had median
subtype F5.5V according to Gray (clipped mean F5.6 +-0.1 s.e.m., +-1.0
st.dev.). Houk's standard (45 Boo) has been consistently classified
F5V by all authors since JM53, so the source of the offset is
unclear. It appears that about half of the Houk "F5V" stars are
classified by Gray as having later hydrogen types (e.g. F5.5 through
F9 with low metallicities, e.g. the latest being "F9V Fe-0.8
CH-0.7"). This probably also explains why the mean B-V color of F5V
stars in Hipparcos (mostly Houk classifications) are ~0.02 mag redder
on average compared to the mean color of Gray's F5V stars and the F5V
standards themselves. I recommend considering Houk's "F5V" stars as
"F5.5V" when comparing to more recent MK classifications.

For F5V Hipparcos stars within 75pc, with parallax S/N > 8, 
and within 1 mag of the MS (N=237):
<V-J>(F5V)   = 0.889 (+-0.005 sem, +-0.062 stdev; N=237)
<V-H>(F5V)   = 1.083 (+-0.007 sem, +-0.089 stdev; N=237)
<V-Ks>(F5V)  = 1.151 (+-0.006 sem, +-0.085 stdev; N=237)
<J-H>(F5V)   = 0.193 (+-0.003 sem, +-0.036 stdev; N=237)
<H-K>(F5V)   = 0.068 (+-0.002 sem, +-0.025 stdev; N=237)
<Bt-Vt>(F5V) = 0.484 (+-0.002 sem, +-0.029 stdev; N=237)
<V-Vt>(F5V)  =-0.051 (+-0.001 sem, +-0.011 stdev; N=237)
<B-K>(F5V)   = 1.616 (+-0.007 sem, +-0.108 stdev; N=241)

<B-V>(F5V)   = 0.467 (+-0.002 sem, +-0.028 stdev); HIP d<75pc S/N>8 N=237
(B-V)(F5V)   =  0.45 ; Johnson63
(B-V)(F5V)   =  0.45 ; Garrison67
(B-V)(F5V)   =  0.45 ; Fitzgerald70
(B-V)(F5V)   =  0.45 ; Bessell79
<B-V>(F5V)   = 0.443 (+-0.004 sem +-0.027 stdev); Gray01/03/06 (N=54)
(B-V)(F5V)   = 0.441 ; prim. stan. HD 27534 
(B-V)(F5V)   =  0.44  ; JohnsonMorgan53
(B-V)(F5V)   =  0.44  ; MorganAbt73
(B-V)(F5V)   =  0.44  ; Schmidt-Kaler82
(B-V)(F5V)   = 0.435 ; tert. stan. iot Peg
(B-V)(F5V)   = 0.434 ; prim. stan. HD 27524
(B-V)(F5V)   = 0.434 ; median for SIMBAD F5V d<25pc (N=14)
(B-V)(F5V)   =  0.43 ; Strassmeier90 halfway between F4V (0.38) and F6V (0.48)
<B-V>(F5V)   =  0.43 +- 0.02 ; Turner77
(B-V)(F5V)   =  0.43  ; Johnson66
(B-V)(F5V)   = 0.429 ; sec. stan. 45 Boo (near solar)
(B-V)(F5V)   =  0.429 ; BakisEker22 
(B-V)(F5V)   = 0.421 ; variant stan. Procyon
(B-V)(F5V)   =  0.42  ; Morgan71
(B-V)(F5V)   = 0.40  ; median CATSUP d<30pc N=3(2 are metal poor)
(B-V)(F5V)   =  0.375 ; Crawford76
=> adopt (B-V)(F5V)  = 0.44  *** [update 8/31/2019] 
=> adopt (U-B)(F5V)  = -0.029
=> adopt (V-I)(F5V)  = 0.508
=> adopt (V-R)(F5V)  = 0.252
=> adopt (R-I)(F5V)  = 0.254
=> adopt (V-J)(F5V)  = 0.853
=> adopt (V-H)(F5V)  = 1.025
=> adopt (V-Ks)(F5V) = 1.079
=> adopt (H-Ks)(F5V) = 0.054
=> adopt (J-H)(F5V)  = 0.173


(G-V)(F5V) =   -0.13    ; HD_108807_ F5V
(G-V)(F5V) =   -0.13    ; HD_128787_ F5V_
(G-V)(F5V) =  -0.1292  ; HD_27524_  F5V B-V=0.436, G=6.6708
(G-V)(F5V) =  -0.123   ; trend for screened late F dwarfs for B-V=0.44 (see 10/24/2020 notes in F5V.txt)
(G-V)(F5V) =  -0.1222  ; HD_27534_  F5V B-V=0.440, G=6.6838
(G-V)(F5V) =   -0.12109 ; HD_134083_ F5V
(G-V)(F5V) =   -0.12109 ; HD_134083_ F5V_
(G-V)(F5V) =   -0.11713 ; HD_210027_ F5V
(G-V)(F5V) =   -0.1163  ; HD_17948_ F5V_
(G-V)(F5V) =   -0.11573 ; HD_77084_ F5V_
(G-V)(F5V) =   -0.11515 ; HD_162521_ F5V_
(G-V)(F5V) =   -0.11426 ; HD_160915_ F5V_
(G-V)(F5V) =   -0.1126  ; HD_98560_ F5V_
(G-V)(F5V) =   -0.1124  ; HD_7788_ F5V_
(G-V)(F5V) =  -0.111   ; Gray01/03/06 F dwarf fit for B-V=0.440
(G-V)(F5V) =   -0.10917 ; HD_739_ F5V_
(G-V)(F5V) =   -0.108   ; HD_27524_ F5V
(G-V)(F5V) =  -0.1077  ; HD_108807_  F5V B-V=0.442, G=7.7503
(G-V)(F5V) =   -0.10759 ; HD_7439_ F5V_
(G-V)(F5V) =   -0.10653 ; HD_201647_ F5V_
(G-V)(F5V) =   -0.10633 ; HD_31746_ F5V_
(G-V)(F5V) =   -0.10632 ; HD_170773_ F5V_
(G-V)(F5V) =   -0.10555 ; HD_104731_ F5V_
(G-V)(F5V) =   -0.10503 ; HD_3302_ F5V+_
(G-V)(F5V) =   -0.10443 ; HD_211976_ F5V_
(G-V)(F5V) =   -0.10436 ; HD_183028_ F5V_
(G-V)(F5V) =   -0.103   ; HD_27534_ F5V
(G-V)(F5V) =   -0.102   ; HD_206893_ F5V_
(G-V)(F5V) =   -0.09354 ; HD_200163_ F5V_
(G-V)(F5V) =   -0.09323 ; HD_32743_ F5V_
(G-V)(F5V) =   -0.09182 ; HD_175317_ F5V_
(G-V)(F5V) =   -0.09097 ; HD_218630_ F5V_
(G-V)(F5V) =   -0.08649 ; HD_213845_ F5V_
(G-V)(F5V) =   -0.08618 ; HD_21722_ F5V_
(G-V)(F5V) =   -0.082   ; initial coarse estimate 
(G-V)(F5V) =   -0.073   ; HD_218268_ F5V_
(G-V)(F5V) =   -0.06657 ; HD_197692_ F5V_
(G-V)(F5V) =   -0.05607 ; HD_57852_ F5V_
(G-V)(F5V) =   -0.05042 ; HD_60584_ F5V_
(G-V)(F5V) =   -0.033   ; HD_44770_ F5V_
=> adopt (G-V)(F5V) = -0.11 [updated 10/30/2020]

(Bp-Rp)(F5V) =  0.5835  ; HD_27524
(Bp-Rp)(F5V) =  0.5865  ; 45_Boo
(Bp-Rp)(F5V) = 0.587    ; color trend for B-V=0.44
(Bp-Rp)(F5V) =  0.5922  ; HD_27534
(Bp-Rp)(F5V) =  0.628   ; Evans18 trend for V-I= 0.508
(Bp-Rp)(F5V) =  0.6704  ; iot_Peg
=> adopt (Bp-Rp)(F5V) = 0.59 [updated 11/18/2020]

(Bp-G)(F5V) = 0.226    ; color trend for B-V=0.44
(Bp-G)(F5V) =  0.2431  ; HD_27524
(Bp-G)(F5V) =  0.2462  ; HD_27534
(Bp-G)(F5V) =  0.2969  ; 45_Boo
(Bp-G)(F5V) =  0.4082  ; iot_Peg
=> adopt (Bp-G)(F5V) = 0.23 [updated 11/18/2020]
 
(G-Rp)(F5V) =  0.2622  ; iot_Peg
(G-Rp)(F5V) =  0.2896  ; 45_Boo
(G-Rp)(F5V) =  0.3404  ; HD_27524
(G-Rp)(F5V) =  0.3459  ; HD_27534
(G-Rp)(F5V) = 0.363    ; color trend for B-V=0.44
=> adopt (G-Rp)(F5V) = 0.36 [updated 11/18/2020]

(Ks-W1)(F5V) = 0.052 ; EEM trend for d<30pc for B-V=0.440
=> adopt (Ks-W1)(F5V) = 0.052 [updated 12/29/2019]

(U-B)(F5V)   =  0.00  ; JohnsonMorgan53, Johnson66
(U-B)(F5V)   = -0.02  ; Fitzgerald70
(U-B)(F5V)   = -0.027 ; HIP d<75pc S/N>8 F5V N=117 (Mermilliod91 photometry)

<V-I>(F5V)   = 0.512 (+-0.004 sem +-0.027 stdev); Gray01/03/06 (N=54)
(V-I)(F5V)   = 0.515 ; Bessell79
<V-I>(F5V)   = 0.538 (+-0.004 sem, +-0.030 stdev); HIP d<75pc S/N>8 N=237

(R-I)(F5V)   = 0.250 ; Bessell79

(g-r)(F5V)   = 0.297 ; Jordi06 (V-R)=>(g-r) for V-R=0.252
(g-r)(F5V)   = 0.26  ; Covey07
(g-r)(F5V)   = 0.243 ; Bilir05 (B-V)=>(g-r) for B-V=0.44
=> adopt (g-r)(F5V) = 0.26 [updated 10/10/2020]

Teff(F5V) =  6432 K ; Boyajian12
Teff(F5V) =  6440 K ; Schmidt-Kaler82
Teff(F5V) = 6470 K ; ter. stan. iot Peg
Teff(F5V) =  6497 K ; B-V=0.438 => Teff(Saxner85)
Teff(F5V) =  6500 K ; Bessell79
Teff(F5V) = 6512 K ; median of 1480 published Teffs for F5V stars
Teff(F5V) = 6515 K ; mean photometric Teff
Teff(F5V) = 6541 K ; Teff from smoothed SpT(Teff) trend
Teff(F5V) = 6547 K ; Gray03/06 F5Vs median from TIC9/Stassun19 (N=32)
Teff(F5V) =  6550 K ; GrayCorbally09
Teff(F5V) =  6550 K ; Blackwell80
Teff(F5V) =  6560 K ; GrayCorbally94
Teff(F5V) = 6572 K ; median Teff for sec. stan. HD 27534 
Teff(F5V) = 6573 K ; median Teff for sec. stan. 45 Boo
Teff(F5V) = 6580 K ; median Teff for prim. stan. HD 27524
Teff(F5V) = 6583 K ; median Teff for variant stan. Procyon
=> adopt Teff(F5V) = 6550 K (logT = 3.8162) [update 9/11/2020]

BCv(F5V) = +0.049 mag ; Balona94(Teff=6550K)
BCv(F5V) = +0.033 mag ; Bertone04(ATLAS,Teff=6550K)
BCv(F5V) = +0.008+-0.054 mag ; calc. for Procyon using Aufdenberg05 fbol
BCv(F5V) = +0.006 mag ; Flower96(Teff=6550K)
BCv(F5V) =  -0.010 mag ; Schmidt-Kaler82(BCv=-0.14 + 0.13 mag offset)
BCv(F5V) = -0.016 mag ; Masana06(Teff=6550K)
BCv(F5V) = -0.018 mag ; Bessell98(ATLAS9,logg=4.5,Teff=6550K)
BCv(F5V) = -0.022 mag ; Casagrande18(Teff=6550K,logg=4.5)
BCv(F5V) = -0.027 mag ; Code76(Teff=6550K)
BCv(F5V) = -0.049 mag ; EEM fit to Casagrande06/08/10(Teff=6570K)
=> adopt BCv(F5V) = -0.02 [last updated 2/10/2020, adjusted so that BCv(5772K)=-0.085]

Mv(F5V)  =   3.5  mag ; Schmidt-Kaler82
Mv(F5V)  =  3.50 mag ; sec. stan. 45 Boo 
Mv(F5V)  =  3.47 mag ; median for SIMBAD F5V d<25pc (N=14)
Mv(F5V)  =  3.45 mag ; B-V=0.438 => EEM fit to SIMBAD dwarfs d<25pc
Mv(F5V)  =  3.42 mag ; ter. stan. HD 210027 = iot Peg 
Mv(F5V)  =   3.4  mag ; GrayCorbally09
Mv(F5V)  =  3.40 mag ; B-V=0.438 => Mv(Wright05)
Mv(F5V)  = 3.38 mag ; linear fit to Gray01/03/06 dwarf sequence (d<50pc) for B-V=0.44
Mv(F5V)  = 3.37 mag ; Gray01/03/06 dwarfs, xHIP B-V/Mv, Gaspar16 |[Fe/H]|<0.05 "solar": fit for B-V=0.44
Mv(F5V)  =  3.31 mag ; F dwarf trend standards/exemplars
Mv(F5V)  =  3.31 mag ; sec. stan. HD 27534
Mv(F5V)  =  3.25 mag ; pri. stan. HD 27524 
Mv(F5V)  =   2.99 mag ; Wegner07
=> adopt Mv(F5V)   = 3.37  mag [update 9/26/2020]
=> adopt M_G(F5V)  = 3.26  mag [updated 12/10/2020] (Mv=3.37, G-V=-0.11)
=> adopt M_Ks(F5V) = 2.291 mag [updated 12/30/2020] (Mv=3.37, V-Ks=1.079)

logL(F5V) = 0.556 dex; Mv=3.37, BCv=-0.02 => Mbol = 3.350
=> adopt logL(F5V) = 0.556 dex [update 9/26/2020]
=> adopt Mbol(F5V) = 3.350 mag [update 9/26/2020]

Rad(F5V) =  1.478 Rsun ; Stassun/TICv8 Rads for smoothed trend for Gray03/06 FVs (Teff=6550K)
Rad(F5V) = 1.4729 Rsun ; Teff=6550, logL=0.556
Rad(F5V) =  1.439 Rsun ; Gray03/06 F5Vs median from TIC9/Stassun19 (N=32)
=> adopt Rad(F5V) = 1.473 Rsun [updated 9/26/2020]

Mass(F5V) = 1.42 Msun ; pri. stan. HD 27524 (Hyad; Goldman13)
Mass(F5V) = 1.38 Msun ; EEM Teff vs. Mass fit for binaries (Teff=6570K)
Mass(F5V) = 1.36 Msun ; HenryMcCarthy93 calibration for Mv=3.4
Mass(F5V) = 1.33 Msun ; Ekers18 ML calibration for logL=0.544
Mass(F5V) = 1.33 Msun ; EEM logL vs. Mass fit for binaries (logL=0.544)
Mass(F5V) = 1.31 Msun ; Bertelli09 solar tracks for Teff=6570K,logL=0.544
Mass(F5V) = 1.30 Msun ; EEM Mv vs. Mass fit for binaries (Mv=3.4)
=> adopt Mass(F5V) = 1.33 Msun [updated 12/29/2019]

# No Standard

Morgan65 does not list an F5V standard

# Primary Standards:

HD 27524 = HIP 20349 = BD+20 740 = Cl Melotte 25 35 (a Hyades member)
 *F5V: Morgan65,MK73,MorganAbt73(stan),MK78,Jaschek78(MK73),Oblak81,Keenan85,Gray89(stan),Gray01,GrayNstars,GrayAtlas
  F5IV-V: Treanor60
  F2V: Adams35

  B-V(HIP)=0.434, Vmag=6.79, Mv=3.25, dMv=-0.12,
  par=19.6+-0.9 mas. Teff = 6470K(Taylor05), 6505K(Vaarenne99),
  6515+-125 K(Gebran10), 6576K(Cenarro01), 6580K(Suchov03),
  6580+-47K(Prugniel11), 6620K(Gray01), 6622+-61K(Masana06),
  6622K(Sanchez-Blazquez06), 6828+-98K(Casagrande11) => median Teff =
  6580K. logg=4.14+-0.06(Prugniel11), 4.20(Gray01), 4.21(Varenne99),
  4.24(Gebran10), 4.25(Cenarro01), 4.28(Sanchez-Blazquez06) =>
  logg=4.2. Mass = 1.42 Msun (Goldman13). Several published
  metallicities (with surprisingly large scatter), but star is a Hyad
  so [Fe/H] should be ~+0.12.

# Secondary Standard

HD 27534 = HIP 20350 = BD+18_629 = SAO 93883 = Cl Melotte 25 36
 *F5V: Cannon(F5),Adams35,Wilson48(F5),MorganAbt73(stan),MK78,Kennedy83(Oblak81),Garcia89,Gray01
  F6V: Morgan65
  F6V-IV: Treanor60

  B-V(HIP)=0.441, Vmag=6.60, Mv=3.31, dMv=-0.10, plx=20.06+-0.59 mas.
  Oddly, Morgan65 calls it F6V, but MorganAbt73 and Morgan78 call it
  F5V standard (we assume the latter is to be adopted). Teff=
  6445K(Taylor05), 6453K(Taylor08), 6463K(Pace12),
  6485+-125K(Gebran10), 6565+-57K(Masana06), 6580K(Suchov03),
  6590K(Gray01), 6675K(Varenne99,Ryabchikova05),
  6748+-87K(Casagrande11) => median
  Teff=6572K. logg=4.17(Pace12). mass=1.382Msun(Pace12),
  1.39-1.41(Casagrande11) => adopt 1.39 Msun. Hyad, so [Fe/H] ~ +0.13
  dex.

45 Boo = HD 134083 = HIP 73996 = HR 5634 = GJ 578
  F6V: Levato78
 *F5V: Roman49,Roman50,JM53,Abt68,Cowley74(stan),HoukStandard,Bidelman85(F5),Gray01,Gray03,GrayNstars
  F4V: Adams35

  Closest to solar metallicity among the F5V standards.  Considered
  part of Ursa Major Group (e.g. Marsden02)
  B-V=0.429+-0.006(HIP,Mermilliod91), V=4.93(HIP),
  V=4.930+-0.007(Mermilliod91), U-B=-0.029+-0.009(Mermilliod91),
  V-I=0.51+-0.05(HIP), dMv=+0.12, plx = 51.14+-0.31mas(HIP2), plx =
  51.6674 +- 0.1882 mas(GaiaDR2), Mv = 3.496+-0.013(HIP,GaiaDR2).
  Teff = 6435+-44K(Valenti05), 6512K(Taylor05), 6517+-30K(Wu11),
  6528K(Schroeder09), 6546K(Erspamer03), 6558+-77K(Ramirez05),
  6563K(diBenedetto98), 6567+-39K(Blackwell98), 6570K(Suchkov03),
  6571+-95K(Alonso96), 6573+-47K(Prugniel11), 6579K(Katz11),
  6583K(LeBorgne03), 6589K(Prugniel07#1), 6595K(Marsakov95),
  6598+-80K(Casagrande11), 6601+-190K(Gonzalez-Hernandez09),
  6632K(Boesgaard88,Boesgaard90), 6632K(Ammler-vonEiff12),
  6739K(Prugniel07#2), 6751K(Prugniel07#3) => median Teff =
  6573K. logg=4.17+-0.05(Prugniel11), 4.18+-0.04(Wu11),
  4.19+-0.06(Valenti05), 4.20(LeBorgne03), 4.23(Erspamer03),
  4.50(Boesgaard90) => adopt logg=4.2.  [Fe/H]=-0.02+-0.03(Valenti05),
  [Fe/H]=-0.02(Respamer03), [Fe/H]=-0.01+-0.03(Prugniel11),
  [Fe/H]=0.03(Prugniel07), [Fe/H]=0.05(Marsakov95),
  [Fe/H]=0.06(LeBorgne03) => essentially solar metallicity.

# Tertiary Standard

HD 210027 = iot Peg = 24 Peg = HIP 109176 = HR 8430 = GJ 848
  F3V: Adams35,Bidelman85(F3)
  F4V: Moore32(F4),Morgan38
  F4/5V: Bouigue59
 *F5V: MK43,JM53,DeVaucouleurs57,Garrison72(stan),Cowley74(stan),Gray01
  F5IV: Maury1897
  F6Va: Barry70

  SB2, per = 10.2 day, mass ratio M2/M1 = 0.62, Mtot=2.27 Msun
  (Agati15), hence M1 = 1.40, M2 = 0.87 Msun (hence companion is
  probably ~K0V). B-V(HIP)=0.435, Vmag=3.77, Mv=3.42, dMv=+0.04,
  par=85.1+-0.6 mas.  PASTEL median values: <Teff> = 6470K(N=12),
  <logg> = 4.30(N=7), <[Fe/H]>=-0.15(N=9).

# Variant Standard

Alf CMi = Procyon = HD 61421 = HR 2943 (J0739+0514)
  F5: Cannon
  F5III: 1978A&AS...35...75C
  F5IV: MK43(stan) 
 *F5IV-V: JM53(stan),MK78(stan),Gray01,Gray03,Garrison96
  F5V: 1937AnHar.105...45H,Cowley76
  F4.5V: 1938ApJ....87..460M
  F4V: Bidelman85(F4),Paunzen01

  Nice thing about Procyon as a F5IV-V standard is most agree on F5
  subtype, indeed Procyon was the F5 HD standard. Excellent "F5IV-V"
  standard. Garrison96 lists Procyon as the only F5IV-V star among the
  brightest ~300 stars on the sky (V<3.55mag), although he lists xi
  Gem as F5IV. PASTEL median values: <Teff> = 6583K (N=43). <[Fe/H]> =
  -0.02 (+-0.01 sem,+-0.06 stdev) (N=28 values), <logg> = 4.01 (+-0.01
  sem, +-0.06 stdev) dex (N=32 values). So yes, somewhat lower log(g).
  V=0.365+-0.009(Mermilliod91), B-V=0.421+-0.008(Mermilliod91),
  U-B=0.021+-0.017(Mermilliod91). fbol = (17.86+-0.89)e-6 erg/cm2/s (Aufdenberg05)
  => mbol=0.373+-0.054(IAU2015 scale). BCv = mbol - V = 0.373+-0.054 - 0.365+-0.009
  = 0.008+-0.054. 

# Other Stars

Morgan65 classifies four Hyads as F5V: HD 27524, 28568, 28911, 29225.

RECONS list shows Procyon (J0739+0513) as the nearest F5IV-V star. 

*but* <B-V>(3 standards) ~ 0.43 , whereas 
              <B-V>(HIP) = 0.465!

HD 76943 = 10 UMa
   F5V: JM53(non-stan)

HD 111456 (Ursa Major member)
   F5V: Morgan53,Cowley76(F5V:)
  *F6V: Adams36,Roman49
   F7V: Barry70(uv metals weak),Levato78

   At least triple system in Ursa Major nucleus. plx=38.1905+-0.2904mas(GaiaDR2).

HD 162003 = psi01 Dra A = HR 6636 = HIP 86614
  F5/6IV: Berger62
  F5IV: Slettebak63,Abt85
 *F5IV-V: Slettebak55,Gray01
  F5V: Adams35,Roman50,Cowley76
  F6: Bidleman85

  V=4.57(HIP), B-V=0.434+-0.004(HIP), V-Ic=0.50+-0.00(HIP).
  plx=43.95+-0.8625mas(GaiaEDR3) => Mv=2.79 => 0.59 mag above MS. 
  see F5IV.txt. 


### Trends in G-V for mid/late F dwarfs

10/24/2020: Selecting F dwarfs classified by Gray, within 100 pc (negligibly reddened),
fainter than G=6.5 (so not affected by saturation; Evans+2018), with sep<10" binaries in GaiaDR2
removed. B-V and V is from Mermilliod91, with only stars with V and B-V errors <=0.02 mag retained.
The following trend fits the late F dwarfs well: 

G-V = 0.2746086 - 1.406909*(B-V) + 1.1432882*(B-V)^2     
(rms = 0.0103mag, for F dwarfs 0.44 < B-V < 0.58)

G-V      ID          B-V    Gmag    SpT 
-0.1077  HD_108807_  0.442  7.7503  F5V
-0.1222  HD_27534_   0.440  6.6838  F5V
-0.1292  HD_27524_   0.436  6.6708  F5V
-0.1300  HD_143463_  0.483  6.7800  F6V_
-0.1312  HD_82241_   0.502  6.8478  F8V_Fe-0.4
-0.1350  HD_28406_   0.451  6.7800  F6V
-0.1373  HD_146835_  0.562  6.9647  F9-V_
-0.1376  HD_23456_   0.518  6.8254  F9V_Fe-0.8CH-0.5
-0.1379  HD_167954_  0.535  6.7071  F9V_
-0.1402  HD_28483_   0.467  6.9648  F6V
-0.1439  HD_118475_  0.622  6.8181  F9V_Fe+0.3
-0.1450  HD_27808_   0.520  6.9900  F8V
-0.1487  HD_36767_   0.538  7.0203  F9V_Fe-0.7CH+0
-0.1514  HD_26784_   0.511  6.9656  F8V
-0.1548  HD_119638_  0.542  6.7562  F8.5V_
-0.1564  HD_28033_   0.538  7.2236  F8V
-0.1572  HD_28394_   0.501  6.8818  F8V
-0.1582  HD_27406_   0.565  7.3118  F9V+
-0.1614  HD_117105_  0.580  7.0386  F9.5V_
-0.1633  HD_30311_   0.557  7.0927  F9.5V_
-0.1663  HD_9670_    0.525  6.7547  F9V_Fe-0.5