F3V

Garrison94 does not list a F3V anchor standard, but MK73 lists HR 1279
(= HD 26015) as a dagger standard.

Morgan65 lists 46 Tau (HD 26690) as its F3V standard, and classified
two Hyads as F3V: HD 26015 & HD 26911. 

JM53 standard:        46 Tau - F3V
Morgan65 standard:    46 Tau - F3V
Garrison72 standard:  46 Tau - F3IV-V
MK73 standard:        HR 1279 (= HD 26015) - F3V (dagger standard)
MorganAbt73 standard: HR 1279 (= vB 11 = HD 26015) - F3V
                      vB 12 - F3V (but this star is G7 elsewhere? T~5250!)
Cowley74 standard:    46 Tau - F3V
                      zet Ser - F3V
Houk75 standard:      46 Tau - F3V (primary standard until MK73, then F3IV/V)
Cowley76 standard:    HR 1279 (= HD 26015) - F3V
MK78 standard:        HR 1279 (= HD 26015),
                      48 Tau  (= HD 26911 = Hyades vB 20) - F3V 
Keenan85 standard:    HR 1279 (= HD 26015 = "BS 1279") - F3V
Gray89 standard:      HR 1279 (= HD 26015) - F3V
GrayAtlas standard:   HR 1279 (= HD 26015) - F3V
GrayNstars standard:  HR 1279 (= HD 26015) - F3V

Skiff08 flags two stars as F3V MK standards: HD 26911 (MK78) & HD
26015 (MK78), both of which were the Hyads classified by Morgan65.

Houk/Michigan Spectral Classifications: The Houk Michigan Spectral
Catalogues contain 4244 stars classified as "F3V", of which 17 were
classified by Gray and collaborators (2001, 2003, 2006) on the modern
system of MK standards (MK78, Gray89). The median Gray classification
of the Houk "F3V" stars is "F4V" (clipped mean F3.7+-0.3 (sem) +-1.3
(rms) subtypes). Hence, we recommend that stars classified "F3V" by
Houk

Gray01/03/06 lists 14 nearby F3V dwarfs. Median colors:
<B-V>(F3V) = 0.375 (+-0.007 sem +-0.021 stdev; N=14)
<V-I>(F3V) = 0.434 (+-0.006 sem +-0.022 stdev; N=14)

For F3V Hipparcos stars within 75pc, with parallax S/N > 8, 
and within 1 mag of the MS (N=95):
<B-V>(F3V)   = 0.421 (+-0.002 sem, +-0.029 stdev; N=95)
<V-I>(F3V)   = 0.489 (+-0.002 sem, +-0.032 stdev; N=95)
<V-J>(F3V)   = 0.803 (+-0.005 sem, +-0.057 stdev; N=95)
<V-H>(F3V)   = 0.970 (+-0.010 sem, +-0.079 stdev; N=95)
<V-Ks>(F3V)  = 1.033 (+-0.008 sem, +-0.081 stdev; N=95)
<J-H>(F3V)   = 0.166 (+-0.004 sem, +-0.033 stdev; N=95)
<H-K>(F3V)   = 0.064 (+-0.003 sem, +-0.026 stdev; N=95)
<Bt-Vt>(F3V) = 0.433 (+-0.003 sem, +-0.032 stdev; N=95)
<V-Vt>(F3V)  =-0.045 (+-0.001 sem, +-0.009 stdev; N=95)
<B-K>(F3V)   = 1.458 (+-0.013 sem, +-0.099 stdev; N=100)

(B-V)(F3V)   = 0.35  ; exemplar HD 107398 A 
(B-V)(F3V)   =  0.36 ; Morgan71
(B-V)(F3V)   = 0.364 ; median for SIMBAD F3V d<25pc (N=5)
(B-V)(F3V)   = 0.366 ; sec. stan. 46 Tau
(B-V)(F3V)   = 0.37  ; Strassemier00 halfway between F2V (0.36) and F4V (0.38)
(B-V)(F2V)   = 0.374 ; median F2V color (see F2V.txt)
<B-V>(F3V)   = 0.375 ; 14 nearby F3V dwarfs from Gray01/03/06
(B-V)(F3V)   = 0.38  ; exemplar HD 107398 B
(B-V)(F3V)   =  0.382 ; BakisEker22 
(B-V)(F3V)   = 0.386 ; exemplar HD 171834
(B-V)(F3V)   = 0.386 ; smoothed trend SpT vs (B-V)o B9.5V-F4V 11/2021
(B-V)(F3V)   = 0.397 ; prim. stan. HD 26015
(B-V)(F3V)   =  0.40 ; MorganAbt73
(B-V)(F3V)   =  0.40 +- 0.01 ; Turner77
(B-V)(F3V)   =  0.41 ; Fitzgerald70
(B-V)(F3V)   = 0.41  ; median F4V color (see F4V.txt)
<B-V>(F3V)   = 0.421 ; 95 nearby F3V dwarfs from HIP d<75pc S/N>8
=> adopt (B-V)(F3V)  = 0.39 *** [updated 8/31/2019]
=> adopt (U-B)(F3V)  = -0.016
=> adopt (V-I)(F3V)  = 0.451
=> adopt (V-R)(F3V)  = 0.223
=> adopt (R-I)(F3V)  = 0.228
=> adopt (V-J)(F3V)  = 0.765
=> adopt (V-H)(F3V)  = 0.913
=> adopt (V-Ks)(F3V) = 0.964
=> adopt (H-Ks)(F3V) = 0.051
=> adopt (J-H)(F3V)  = 0.148 


(G-V)(F3V) =  -0.133    ; HD_23289_ F3V
(G-V)(F3V) =  -0.10903  ; HD_29992_ F3V_
(G-V)(F3V) =  -0.10087  ; HD_125451_ F3V_
(G-V)(F3V) =  -0.09879  ; HD_153363_ F3V_
(G-V)(F3V) = -0.095     ; Gray01/03/06 F dwarfs fit for B-V=0.39
(G-V)(F3V) =  -0.09264  ; HD_90589_ F3V_
(G-V)(F3V) =  -0.0883   ; HD_136751_ F3V
(G-V)(F3V) =  -0.08656  ; HD_22001_ F3V_
(G-V)(F3V) =  -0.08593  ; HD_203_ F3Vn_
(G-V)(F3V) =  -0.083    ; HD_222788_ F3V_
(G-V)(F3V) =  -0.07483  ; HD_14691_ F3V(n)_
(G-V)(F3V) =  -0.07358  ; HD_26462_ F3V
=> adopt (G-V)(F3V) = -0.09 [updated 10/30/2020]

(Bp-Rp)(F3V) =  0.4905  ; 46_Tau
(Bp-Rp)(F3V) =  0.5040  ; HD_26015
(Bp-Rp)(F3V) =  0.5166  ; HD_171834
(Bp-Rp)(F3V) = 0.518   ; color trend for B-V=0.39
(Bp-Rp)(F3V) =  0.5194  ; HD_107398_A
(Bp-Rp)(F3V) =  0.5216  ; HD_107398_B
(Bp-Rp)(F3V) =  0.559   ; Evans18 trend for V-I=0.451
(Bp-Rp)(F3V) =  0.5654  ; HD_106691
=> adopt (Bp-Rp)(F3V)= 0.52 [updated 11/18/2020]

(Bp-G)(F3V) = 0.196   ; color trend for B-V=0.39
(Bp-G)(F3V) =  0.2119  ; HD_26015
(Bp-G)(F3V) =  0.2166  ; HD_107398_A
(Bp-G)(F3V) =  0.2176  ; HD_107398_B
(Bp-G)(F3V) =  0.2315  ; HD_106691
(Bp-G)(F3V) =  0.2353  ; HD_171834
(Bp-G)(F3V) =  0.2722  ; 46_Tau
=> adopt (Bp-G)(F3V) = 0.20 [updated 11/18/2020]
 
(G-Rp)(F3V) =  0.2183  ; 46_Tau
(G-Rp)(F3V) =  0.2813  ; HD_171834
(G-Rp)(F3V) =  0.2921  ; HD_26015
(G-Rp)(F3V) =  0.3028  ; HD_107398_A
(G-Rp)(F3V) =  0.3040  ; HD_107398_B
(G-Rp)(F3V) = 0.324   ; color trend for B-V=0.39
(G-Rp)(F3V) =  0.3339  ; HD_106691
=> adopt (G-Rp)(F3V) = 0.32 [updated 11/18/2020]


(Ks-W1)(F3V) = 0.051 ; EEM trend for d<30pc for B-V=0.390
=> adopt (Ks-W1)(F3V) = 0.051 [updated 12/29/2019]


(U-B)(F3V)   = -0.01  ; Fitzgerald70
(U-B)(F3V)   = -0.033 ; HIP d<75pc S/N>8 F3V N=53 (Mermilliod91 photometry)

(g-r)(F3V) = 0.251 ; Jordi06 (V-R)=>(g-r) for V-R=0.223
(g-r)(F3V) = 0.213 ; Covey07 interp F2V-F5V
(g-r)(F3V) = 0.187 ; Bilir05 (B-V)=>(g-r) for B-V=0.39
=> adopt (g-r)(F3V) = 0.21 [updated 10/10/2020]

Teff(F3V) =  6609 K ; Boyajian12
Teff(F3V) =  6672 K ; B-V=0.389 => Teff(Saxner85)
Teff(F3V) = 6680 K ; exemplar HD 106691
Teff(F3V) = 6705 K ; EEM N=829 Teffs
Teff(F3V) = 6725 K ; B-V vs. Teff trend interp between F2V and F4V
Teff(F3V) = 6740 K ; mean photometric Teff
Teff(F3V) = 6745 K ; exemplar HD 107398 B
Teff(F3V) = 6750 K ; exemplar HD 107398 A
Teff(F3V) =  6750 K ; GrayCorbally09
Teff(F3V) =  6770 K ; GrayCorbally94
Teff(F3V) = 6770 K ; exemplar HD 171834
Teff(F3V) = 6790 K ; Gray03/06 F3Vs median from TIC9/Stassun19 (N=8)
Teff(F3V) = 6792 K ; Teff from smoothed SpT(Teff) trend
Teff(F3V) = 6805 K ; pri. stan. HD 26015
Teff(F3V) = 6895 K ; sec. stan. HD 26690 = 46 Tau 
=> adopt Teff(F3V) = 6750 K (logT = 3.829) [updated 9/11/2020]

BCv(F3V) = +0.064 mag ; Balona94(Teff=6750K)
BCv(F3V) = +0.047 mag ; Bertone04(ATLAS,Teff=6750K)
BCv(F3V) = +0.018 mag ; Flower96(Teff=6750K)
BCv(F3V) = -0.007 mag ; Masana06(Teff=6750K)
BCv(F3V) = -0.015 mag ; Casagrande18(Teff=6730K,logg=4.5)
BCv(F3V) = -0.015 mag ; Code76(Teff=6750K)
BCv(F3V) = -0.018 mag ; Bessell98(ATLAS9,logg=4.5,Teff=6750K)
BCv(F3V) = -0.054 mag ; EEM fit to Casagrande06/08/10(Teff=6750K)
=> adopt BCv(F3V) = -0.01 [last updated 8/31/2019, adjusted so that BCv(5772K)=-0.085]

Mv(F3V)  =   3.1  mag  ; GrayCorbally09
Mv(F3V)  =  3.08 mag ; B-V=0.389 => Mv(Wright05)
Mv(F3V)  = 3.08 mag  ; linear B-V vs. Mv fit to d<50pc Gray01/03/06 dwarfs for B-V=0.39
Mv(F3V)  =  3.07 mag ; B-V=0.389 => EEM fit to SIMBAD dwarfs d<25pc
Mv(F3V)  =  3.02 mag ; deprecated stan. HD 26911 = 48 Tau
Mv(F3V)  =  2.99 mag ; A/F dwarf sequence for B-V=0.39
Mv(F3V)  = 2.99 mag ; Gray01/03/06 dwarfs, xHIP B-V/Mv, Gaspar16 |[Fe/H]|<0.05 "solar": fit for B-V=0.39
Mv(F3V)  =  2.96 mag ; F dwarf trend standards/exemplars
Mv(F3V)  =  2.89 mag ; median for SIMBAD F3V d<25pc (N=5)
Mv(F3V)  =  2.81 mag ; exemplar HD 171834 
Mv(F3V)  =   2.69 mag ; Wegner07
Mv(F3V)  =  2.66 mag ; pri. stan. HD 26015
Mv(F3V)  =  2.49 mag ; sec. stan. HD 26690 = 46 Tau
Mv(F3V)  =  2.49 mag ; exemplar HD 107398 B
Mv(F3V)  =  2.39 mag ; exemplar HD 107398 A 
=> adopt Mv(F3V)   = 3.08  mag [updated 9/26/2020]
=> adopt M_G(F3V)  = 2.99  mag [updated 12/10/2020] (Mv=3.08, G-V=-0.09)
=> adopt M_Ks(F3V) = 2.116 mag [updated 12/30/2020] (Mv=3.08, V-Ks=0.964)
[EEM: although 3.08 appears somewhat faint compared to the standards, it appears to be good fit through
local F dwarfs]

logL(F3V) = 0.704 dex ; Mv=2.99, BCv=-0.01 => Mbol = 2.980
logL(F3V) = 0.668 dex ; Mv=3.08, BCv=-0.01 => Mbol = 3.070
=> adopt logL(F3V) = 0.668 dex [updated 9/26/2020]
=> adopt Mbol(F3V) = 3.070 mag [updated 9/26/2020]

Rad(F3V) =  1.645 Rsun ; 6750K,logL=0.704
Rad(F3V) =  1.595 Rsun ; Gray03/06 F3Vs median from TIC9/Stassun19 (N=14)
Rad(F3V) =  1.595 Rsun ; smoothed SpT vs Rad trend A/F dwarfs
Rad(F3V) = 1.5778 Rsun ; logL=0.668, Teff=6750K 
Rad(F3V) =  1.565 Rsun ; Stassun/TICv8 Rads for smoothed trend for Gray03/06 FVs (Teff=6750K)
=> adopt Rad(F3V) = 1.578 Rsun [updated 9/26/2020]

Mass(F3V) = 1.535 Msun ; median mass for pri. stan. HD 26015
Mass(F3V) = 1.47 Msun ; HenryMcCarthy93 calibration for Mv=3.0
Mass(F3V) = 1.44 Msun ; EEM Teff vs. Mass fit for binaries (Teff=6750K)
Mass(F3V) = 1.44 Msun ; Ekers18 ML calibration for logL=0.700
Mass(F3V) = 1.44 Msun ; EEM logL vs. Mass fit for binaries (logL=0.700)
Mass(F3V) = 1.41 Msun ; EEM Mv vs. Mass fit for binaries (Mv=3.0)
Mass(F3V) = 1.41 Msun ; Bertelli09 solar tracks for Teff=6750,logL=0.70
=> adopt Mass(F3V) = 1.44 Msun [updated 12/29/2019]

# No standard

Corbally86 does not list a F3V standard. 

# Primary Standard

HD 26015 = HR 1279 = HIP 19261 = Cl Melotte 25 11 = vB 11 (Hyad)
 *F3V: Morgan65,MK73,MorganAbt73,Cowley76(stan),MK78(stan),Jaschek78,Abt81,Keenan85,Garcia89,Gray89(stan),Gray01,GrayNstars
  F2: Wilson48
  F5V: Adams35
  F0: Cannon

  No Houk type. B-V(HIP)=0.397, Vmag=6.02, Mv=2.66, delMv=-0.47,
  par=21.3+-1.1 mas. WDS: binary, with companion 3.8" separation,
  V=8.77 (called G7 or K0V in literature). Rayner09 (IRTF Spectral
  Atlas) comment "The spectrum is normal up to 2.22 um but at longer
  wavelengths some metal lines go into weak emission (Ca i doublet at
  2.263 and 2.267 um, Mg i at 2.280 um, Na i at 2.339 um, and Mg i at
  3.867um. The continuum is also slightly bluer than normal for a
  spectral type of F3V. The star is classified as variable (of
  unspecified type) in the GCVS and is slightly metal rich ([Fe/H] =
  0.2, average from SIMBAD)."  Interestingly, the famous "Li chasm"
  for the Hyades occurs for 6600 K < Teff < 6800 K, i.e. right at F3V
  and HD 26015's Teff. Hipparcos photometry showed scatter of only
  0.006 mag in Hpscat (N=52 obs), Hpmax=6.08, Hpmin=6.10. Teffs:
  6702K(Taylor05), 6729K(Taylor08), 6799+-80K(Casagrande11), 6800K
  (Suchov03), 6811K (Boesgaard88, Boesgaard89, Boesgaard90, as
  reported in Soubiran10), 6828K (Varenne99, Ryabchikova05),
  6860+-125K(Gebran10), 6880K(Gray01) => median Teff = 6805K. Mass =
  1.56 Msun(Roeser11), 1.49 Msun(Casagrande11) => median mass = 1.535
  Msun. As a Hyad, [Fe/H] ~ +0.13 dex.

# Secondary Standard

HD 26690 = 46 Tau = HR 1309 = HIP 19719
  F0: Cannon
  F0V: Adams35
  F2V: Christy69,Abt81,Gray06
  F2V+F5V: WDS
  F2(V)+F3(V): Beavers80
  F2III: Wilson50
 *F3V: Johnson53,Slettebak55,Jaschek64,all),Morgan65(stan),Cowley74(stan)
  F3IV/V: Houk
  F3IV-V: Garrison72(stan)
  F4V: Barry70

  Varies F0-F4 in literature, but good agreement between Morgan, Houk,
  Garrison. B-V(HIP)=0.366, V=5.29, Mv=2.49, delMv=-0.45,
  par=27.52+-0.58 mas Morgan65 calls 46 Tau the F3V "Fundamental
  Classification Standard".  WDS reports it as F2V+F5V binary with
  0.1" separation, with magnitudes 5.7 and 6.7.  Soederhjelm99 reports
  delta(mag)=0.91, Horsch08 reports delta(V)=0.99.  plx
  =25.2041+-0.4328mas(GaiaDR2). V(AB)=5.29, so for delta(V)=0.99,
  V(A)=5.66, V(B)=6.65, so Mv(A)=2.67, Mv(B)=3.66.  PASTEL shows only
  one value: Teff=6695K(GaiaDR2), 6820K(Gray06),
  6864+-80K(Casagrande11), 6925K(Marsakov95), 6950K(Suchkov03),
  6998+-238K(David15) => <Teff>=6895K.

# Deprecated Standards

HD 26911 = 48 Tau = HIP 19877 = HR 1319 = Cl Melotte 25 20 (Hyad)
  F2V: Adams35
 *F3V: Morgan65,MK78(stan),Garcia89(MK78)
  F5V: Jaschek64,Jaschek78(Eggen50),Cannon
  F6V: Cowley76
  F6III: Harlan69

  No Houk type. Types varied F2-F6 pre-1970.  B-V(HIP)=0.400,
  Vmag=6.31, Mv=3.02, delMv=-0.13, par=22.02+-0.47 mas(HIP2).  Used in
  MK78 as a comparison normal F3V dwarf.

zet Ser = HR 6710 = HD 164259
  F0: Cannon
  F1V:  Adams35
  F2IV: MK43
 *F2V: Gray03 
  F2IV-V: Gray89
  F2IV: Houk99("SIMBAD type")
  F3V: 1937AnHar.105...45H,JM53,DeVaucouleurs57,Jaschek64(most),Cowley74(stan)
  F4V: Malaroda75
  F5III: 1978A&AS...35...75C

  Only F3V star mentioned in Johnson53, although not technically a
  standard.  Alternates between F2 and F3 too much to be really
  considered a good standard.

# Exemplars

HD 106691 = Cl Melotte 111 36 = BD+26 2321 (Coma Ber cluster member)
  F1: 1953UppAn...3j...1W
  F2V: Trumpler38
  F2+V: Weaver52
 *F3V: 1952AN....280..121S(F3),Mendoza63,Abt77,Clausen79
  F5IV: Moore50

  V=8.09(HIP), B-V=0.408+-0.010(HIP), V-Ic=0.48+-0.02(HIP), Coma Ber
  cluster reddening E(B-V)=0.006+-0.013(Nicolet81),
  E(B-V)<0.0032(Taylor06).  Teffs: 6752K(Stevens17),
  6724+-80K(Casagrande11), 6713K(GaiaDR2), 6713K(Gebran08),
  6690K(Boesgaard87), 6670K(Suchkov03), 6664+-227K(David15),
  6655+-17K(Luo18,LAMOST), 6647K(Luck17), 6578K(Bermejo13) => <Teff> =
  6680K. logg=4.162+-0.028(Luo15), [Fe/H]=-0.071+-0.016(Luo18).

HD 107398 B = Cl Melotte 111 72 = WDS J12207+2703B = TYC 1991-1899-1 = HR 4698 B
  F0: Lindblad34
  F2: 1923LicOB..10..169L, Struve55(F2n)
 *F3V: Appenzeller67,Gray01,Abt08

  Part of 8.9" pair. V=7.18(Mermilliod91), B-V=0.38(Mermilliod91),
  U-B=-0.01(Mermilliod91).  B_T=7.564+-0.007(Tycho),
  V_T=7.153+-0.008(Tycho), B-V=0.395+-0.011(EEMconversion),
  V=7.107+-0.008(Mamajek06conversion).  Delta(V) ~ 0.094 compared to
  A.  J = 6.381+-0.026, H=6.229+-0.024, Ks=6.195+-0.023(2MASS).  V-Ks
  = 7.107 - 6.195 = 0.912. Teff = 6745K(GaiaDR2#2).
  plx=11.9042+-0.0438mas(GaiaDR2). Mv=2.49.

HD 107398 A = Cl Melotte 111 73 = TYC 1991-1898-1 = HR 4698 A
  F0:  Lindblad34
  F2V: 1923LicOB..10..169L(F2),Cowley76
  F3V: Struve53(F3),Appenzeller67,Abt08
 *F3V(n): Gray01

  Part of 8.9" pair. HR 4698 appears to represent
  both. V(A)=7.080(Mermilliod91), B-V=0.350(Mermilliod91),
  U-B=0.01(Mermilliod91).  B_T=7.454+-0.008(Tycho), V_T=7.058+-0.007,
  B-V=0.380+-0.011(Mamajek06conversion),
  V=7.013+-0.007(Mamajek06conversion). B is delta(V) ~ 0.094 mag
  fainter than A. J = 6.259+-0.020, H = 6.131+-0.021,
  Ks=6.091+-0.018(2MASS).  V-Ks = 7.013 - 6.091 = 0.922. Teff =
  6745K(GaiaDR2#2), 6750K(GaiaDR2#1), 6816+-80K(Casagrande11).
  plx=11.9041+-0.0397mas(GaiaDR2). Mv=2.39(HIP,GaiaDR2).

HD 171834 = HR 6987 = HIP 91237 
  F0III:  1978A&AS...35...75C
  F1V: Adams35
  F2V: Wilson50
  F2IV-V: Jaschek80(CaI 4227A strong)
 *F3V: Cowley76,Abt85,KahramanAliçavuș16
  F4V: Harlan74

  Strangely WDS lists 5 components, splits a speckle Aa+Ab with 0.2"
  separation, then 4 other components at separations 35.9"-263".  But
  GaiaDR2 shows a faint companion 9.34" away that is delta(G)=9.35
  fainter.  plx=29.8652+-0.1329mas(GaiaDR2). V=5.43(HIP),
  B-V=0.386+-0.004(HIP), V-Ic=0.45+-0.00(HIP). PASTEL: <Teff> =
  6770K(N=6), logg=4.135(N=4), [Fe/H]= -0.19(N=4).
  plx=30.23+-0.27mas(HIP2,pair). Mv=2.81(HIP,GaiaDR2).


# Other Stars

HD 203 = HR 9 = HIP 45836 
 *F3V: Adams35,Cowley76,Grenier99
  F4V: Cowley79
  F5V: Abt81

  5.6" binary in WDS. plx = 34.1427 +- 0.0552 mas(GaiaDR2).
  Unresolved photometry: V=6.16(Mermilliod91), V=6.14(HIP),
  B-V=0.420(Mermilliod91), B-V=0.436+-0.002(HIP),
  V-Ic=0.50+-0.00(HIP), U-B=-0.110(Mermilliod91).  WDS lists
  V(A)=6.19, V(B)=10.00.

HD 153890 = HR 6327 = V923 Sco
  F3V: 1953AnHar.119....1H,Malaroda75,Houk82
  F3IV-V+F3V: Bennett63
  F4V+F4V: Fekel11
  F5: Bolton76

  Fekel11 says delta(V)=0.3, and both components match tet Cyg, which
  he calls F4V based on Slettebak55 (which Gray03 classifies as F3+V).
  Fekel11 splits the V(AB)=5.91(HIP) into V(A)=6.52, V(B)=6.82, and
  B-V(A)=0.399, B-V(B)=0.419.  plx = 15.46+-0.40mas(HIP2). Per = 34.8
  day (Fekel11)