K3V Garrison94 does not list a K3V anchor standard, nor does MK73 list a K3V dagger standard. Pecaut16 shows that Michigan/Houk K3Vs map well to the K3Vs from the NStars surveys by Gray03/06. MK43 standards: HD 219134 (=HR 8832) - K3V JM53 standards: HD 110463 - K3V HD 128165 - K3V HD 219134 - K3V Wilson62 standards: HD 110463 - K3V [from JM53] HD 128165 - K3V [from JM53] HD 219134 - K3V [from JM53] Houk75 standard: HD 16160 (=HR 753) - K3V (secondary standard) KeenanMcNeil76 stan.: HD 16160 (=HR 753) - K3V Corbally86 standard: vB 25 (= HD 285690) - K3V Keenan80 standard: BY Dra (=HD 234677) - K3V + MVe HD 219134 (=HR 8832) - K3V HD 223778 (=HR 9038) - K3V Keenan83 standard: HD 219134 (=GJ 892) - K3V HD 223778 (=HR 9038) - K3V HD 160346 (=GJ 688) - K3-V Keenan85 standard: HD 219134 (=HR 8832) - K3V HD 223778 (=HR 9038) - K3V Keenan88 standard: HD 219134 (=GJ 892) - K3V Keenan89 standard: HD 16160 (=HR 753) - K3V HD 219134 (=Gl 892) - K3V HD 16160 (=GJ 105) - K3-V Keenan99 standard: HD 16160 (=GJ 105) - K3V HD 34673 - K3V GrayNstars standard: HD 16160 (=HR 753) - K3V Pecaut13 standard: HD 16160 (=HR 753) - K3V Skiff08 flags two stars as K3V MK standards, both from Keenan89: HD 16160 and HD 219134. (K3V) = 0.899 ; Crawford76 (K3V) = 0.95 ; Fitzgerald70 (B-V)(K3V) = 0.955 ; sec. stan. HD 110463 (B-V)(K3V) = 0.96 ; SchmidtKaler82 (B-V)(K3V) = 0.960 ; exemplar HD 207144 (B-V)(K3V) = 0.960 ; exemplar HD 144872 (K3V) = 0.968 [+-0.009 sem,+-0.068 stdev]; med. for 53 K3V stars ARICNS (B-V)(K3V) = 0.97 ; prim. stan. HD 16160 (B-V)(K3V) = 0.980 ; trend for 5 standards [Fe/H] vs. B-V for [Fe/H]=0.0 (K3V) = 0.98 ; Hyades; Wilson62(N=9) (B-V)(K3V) = 0.982 ; exemplar HD 114386 (B-V)(K3V) = 0.983 ; ter. stan. HD 285690 (B-V)(K3V) = 0.987 ; interp pri.stans HD219134([Fe/H]=0.05,B-V=0.994),HD16160([Fe/H]=-0.12,B-V=0.97) for [Fe/H]=0.0 (K3V) = 0.990 ; 155 HIP d<75pc (+-0.007 sem, +-0.066 stdev) (B-V)(K3V) = 0.994 ; median SIMBAD K3V d<25pc (N=45) (K3V) = 0.997 ; 63 Gray01/03/06 (+-0.006 sem, +-0.038 stdev) (B-V)(K3V) = 0.997 ; sec. stan. HD 128165 (B-V)(K3V) = 1.000 ; median for N=40 K3V stars w/i 30 pc (Hinkel17) (B-V)(K3V) = 1.000 ; prim. stan. HD 219134 ([Fe/H] ~ +0.05) (B-V)(K3V) = 1.01 ; CATSUP d<30pc median (Hinkel17; N=39) (K3V) = 1.01 ; Vyssotsky63 (B-V)(K3V) = 1.01 ; JohnsonMorgan53 (B-V)(K3V) = 1.017 ; exemplar HD 39715 = GJ 223 (B-V)(K3V) = 1.023 ; Koen10 d<25pc median K3V (B-V)(K3V) = 1.033 ; exemplar HD 125072 = GJ 542 ([Fe/H] = +0.26) (B-V)(K3V) = 1.04 ; exemplar HD 122064 = HR 5256 ([Fe/H] = +0.16) => adopt (B-V)(K3V) = 0.990 [last updated 12/15/2020] => adopt (U-B)(K3V) = 0.793 => adopt (Bt-Vt)(K3V)= 1.161 => adopt (V-I)(K3V) = 1.054 => adopt (V-R)(K3V) = 0.561 => adopt (R-I)(K3V) = 0.493 => adopt (V-J)(K3V) = 1.803 => adopt (V-H)(K3V) = 2.291 => adopt (H-Ks)(K3V) = 0.109 => adopt (J-H)(K3V) = 0.487 => adopt (V-Hp)(K3V) = -0.138 => adopt (W1-W3)(K3V)= -0.031 => adopt (W1-W4)(K3V)= -0.005 => adopt (G-J)(K3V) = 1.482 => adopt (G-Ks)(K3V) = 2.078 (Ks-W1)(K3V) = 0.079 ; EEM trend for d<30pc for B-V=0.99 => adopt (Ks-W1)(K3V) = 0.079 [updated 12/29/2019] (U-B)(K3V) = 0.790 ; HIP d<75pc S/N>8 K3V N=137 (Mermilliod91 photometry) (U-B)(K3V) = 0.89 ; JohnsonMorgan53 (V-I)(K3V) = 1.00 ; HD 110463 (HIP) (K3V) = 1.030 (+-0.006 sem, +-0.071 stdev; N=155 HIP K3V d<75pc; S/N>8) (K3V) = 1.038 (+-0.008 sem, +-0.041 stdev; N=63 Gray01/03/06 K3V stars) (V-I)(K3V) = 1.04 ; HD 128165 (HIP) (V-I)(K3V) = 1.06 ; HD 16160 (HIP) (V-J)(K3V) = 1.701 ; HD 110463 (HIP,2MASS) (V-H)(K3V) = 2.157 ; HD 110463 (HIP,2MASS) (V-H)(K3V) = 2.368 ; HD 128165 (HIP,2MASS) (V-Ks)(K3V) = 2.267 ; sec. stan. HD 110463 (V-Ks)(K3V) = 2.273 ; ter. stan. HD 285690 (V-Ks)(K3V) = 2.34 ; pri. stan. HD 219134 (V-Ks)(K3V) = 2.379 ; exemplar HD 114386 (V-Ks)(K3V) = 2.391 ; exemplar HD 207144 = GJ 9754 (K3V) = 2.411 (+-0.018 sem, +-0.186 stdev; N=155 HIP K3V d<75pc; S/N>8) (V-Ks)(K3V) = 2.413 (+-0.206 stdev; N=27 SIMBAD K3V d<25pc) (V-Ks)(K3V) = 2.451 ; ter. stan. HD 128165 (V-Ks)(K3V) = 2.46 ; exemplar HD 144872 = GJ 612 (V-Ks)(K3V) = 2.485 ; exemplar HD 39715 => adopt (V-Ks)(K3V) = 2.40 [updated 4/9/2020 ; consistent with B-V=0.99] (G-V)(K3V) = -0.359 ; GJ_892 pri. stan. (G-V)(K3V) = -0.345 ; GJ_105A pri. stan. (G-V)(K3V) = -0.324 ; GJ_556 ter. stan. (G-V)(K3V) = -0.324 ; color fit for B-V=0.99 (G-V)(K3V) = -0.320 ; trend for SIMBAD d<20pc for V-Ks=2.40 (G-V)(K3V) = -0.319 ; smooth fit f(SpT) G9V-M0V (G-V)(K3V) = -0.308 ; HD_285690 ter. stan. (G-V)(K3V) = -0.300 ; GJ_3743 sec. stan. => adopt (G-V)(K3V) = -0.32 [updated 9/21/2021] (Bp-Rp)(K3V) = 1.1537 ; HD_285690 (Bp-Rp)(K3V) = 1.1655 ; HD_110463 (Bp-Rp)(K3V) = 1.1915 ; HD_144872 (Bp-Rp)(K3V) = 1.1947 ; HD_207144 (Bp-Rp)(K3V) = 1.2014 ; HD_114386 (Bp-Rp)(K3V) = 1.2078 ; HD_219134 pri. stan. (Bp-Rp)(K3V) = 1.2102 ; HD_16160 pri. stan. (Bp-Rp)(K3V) = 1.2224 ; HD_128165 (Bp-Rp)(K3V) = 1.2338 ; HD_122064 (Bp-Rp)(K3V) = 1.2457 ; HD_39715 => adopt (Bp-Rp)(K3V) = 1.21 [updated 11/10/2020] (G-Rp)(K3V) = 0.6275 ; HD_219134 pri. stan. K3V (G-Rp)(K3V) = 0.6324 ; HD_285690 (G-Rp)(K3V) = 0.6359 ; HD_110463 (G-Rp)(K3V) = 0.64 ; Bp-Rp=1.21, Bp-G=0.57 (G-Rp)(K3V) = 0.6419 ; HD_16160 pri. stan. K3V (G-Rp)(K3V) = 0.6506 ; HD_144872 (G-Rp)(K3V) = 0.6525 ; HD_114386 (G-Rp)(K3V) = 0.6533 ; HD_207144 (G-Rp)(K3V) = 0.6554 ; HD_128165 (G-Rp)(K3V) = 0.6612 ; HD_122064 (G-Rp)(K3V) = 0.6754 ; HD_39715 => adopt (G-Rp)(K3V) = 0.64 [updated 11/10/2020; Bp-Rp=1.21, Bp-G=0.57] (Bp-G)(K3V) = 0.5213 ; HD_285690 (Bp-G)(K3V) = 0.5295 ; HD_110463 (Bp-G)(K3V) = 0.5408 ; HD_144872 (Bp-G)(K3V) = 0.5414 ; HD_207144 (Bp-G)(K3V) = 0.5489 ; HD_114386 (Bp-G)(K3V) = 0.5669 ; HD_128165 (Bp-G)(K3V) = 0.5683 ; HD_16160 pri. stan. K3V (Bp-G)(K3V) = 0.57 ; Bp-Rp=1.21, G-Rp=0.64 (Bp-G)(K3V) = 0.5703 ; HD_39715 (Bp-G)(K3V) = 0.5726 ; HD_122064 (Bp-G)(K3V) = 0.5803 ; HD_219134 pri. stan. K3V => adopt (Bp-G)(K3V) = 0.57 [updated 11/10/2020; Bp-Rp=1.21, G-Rp=0.64] (g-r)(K3V) = 0.791 ; Jordi06 (V-R)=>(g-r) for V-R=0.561 (g-r)(K3V) = 0.85 ; Covey07 (g-r)(K3V) = 0.861 ; Bilir05 (B-V)=>(g-r) for B-V=0.990 => adopt (g-r)(K3V) = 0.85 [updated 10/10/2020] Teff(K3V) = 4662 +- 17 K ; pri. stan. GJ 105A (Boyajian12) Teff(K3V) = 4680 +- 15 K ; Boyajian12b (N=2) Teff(K3V) = 4700 K ; GrayCorbally09 Teff(K3V) = 4730 K ; Schmidt-Kaler82 Teff(K3V) = 4743 K ; Ramirez05 Teff calibration for B-V=0.990 Teff(K3V) = 4777 K ; CATSUP d<30pc trend for [Fe/H]=0 for +-0.1 dex of solar (Hinkel17;N=15) Teff(K3V) = 4782 K ; median Teff among 183 published Teffs for K3V *s Teff(K3V) = 4783 K ; non-stan. GJ 223 Teff(K3V) = 4793 K ; non-stan. HD 144872 Teff(K3V) = 4812 K ; Teff for d<30pc [Fe/H]=+-0.1 dex dwarfs from Hinkel17 for B-V=0.99 Teff(K3V) = 4813 K ; pri. stan. HR 8832 median Teff ([Fe/H]=+0.05) Teff(K3V) = 4814 K ; trend for K3V d<30pc (Hinkel17) all PASTEL Teff/[Fe/H] trend for [Fe/H]=0.0 Teff(K3V) = 4820 K ; exemplar HD 114386 Teff(K3V) = 4827 +- 18 K ; Pecaut13 (GJ 105) Teff(K3V) = 4827 K ; interp pri. stans HR 8832 & HD16160 for [Fe/H]=0.0 Teff(K3V) = 4832 K ; smoothed Teff(SpT) trend Teff(K3V) = 4843 K ; mean photometric Teff Teff(K3V) = 4860 K ; GrayCorbally94 Teff(K3V) = 4860 K ; trend for [Fe/H]=0.0 for standards & exemplars Teff(K3V) = 4861 K ; pri. stan. HD 16160 median Teff ([Fe/H]=-0.12) Teff(K3V) = 4862 K ; Casagrande10 Teff calibration for B-V=0.990 Teff(K3V) = 4865 K ; non-stan. HD 215152 Teff(K3V) = 4877 K ; exemplar HD 207144 Teff(K3V) = 4878 +- 18 K ; Pecaut13 (pri. stan. GJ 892) Teff(K3V) = 4894 K ; exemplar HD 122064 = HR 5256 Teff(K3V) = 4919 K ; ter. stan. HD 285690 (Hyad) Teff(K3V) = 4925 K ; Biazzo07 Teff calibration for B-V=0.990 Teff(K3V) = 4950 K ; sec. stan. HD 110463 (UMa) => adopt Teff(K3V) = 4830 K (logT = 3.684) [updated 12/15/2020] [EEM 12/15/2020: had originally adopted Teff as high as 4860K, however closer examination suggests lower Teff around 4830K. This cooler Teff also pushes the mean radius up closer to the observed radii for the standards] BCv(K3V) = -0.418 mag ; EEM fit to Casagrande06/08/10 (Teff=4830K) BCv(K3V) = -0.417 +- 0.018 mag ; pri. stan. GJ 105A (Pecaut13) BCv(K3V) = -0.389 mag ; Flower96(Teff=4830K) BCv(K3V) = -0.388 mag ; Masana06(Teff=4830K) BCv(K3V) = -0.376 +- 0.018 mag ; pri. stan. GJ 892 (Pecaut13) BCv(K3V) = -0.376 +- 0.012 mag ; pri. stan. GJ 105A (see below) BCv(K3V) = -0.376 mag ; Bessell98(ATLAS9,logg=4.5,Teff=4830K) BCv(K3V) = -0.370 mag ; Schmidt-Kaler82(BCv=-0.50 + 0.13 offset) BCv(K3V) = -0.365 mag ; Casagrande18(Teff=4830K,logg=4.5) BCv(K3V) = -0.312 +- 0.011 mag ; pri. stan. GJ 892 (see below) BCv(K3V) = -0.312 mag ; Bertone04(ATLAS,Teff=4830K) => adopt BCv(K3V) = -0.375 mag [last updated 12/15/2020, scaled to BCv(5772K)=-0.085] Mv(K3V) = 6.9 mag ; GrayCorbally09 Mv(K3V) = 6.79 mag ; exemplar HD 144872 ([Fe/H] ~ -0.48) Mv(K3V) = 6.79 mag ; exemplar HD 39715 = GJ 223 ([Fe/H] ~ -0.10) Mv(K3V) = 6.69 mag ; exemplar HD 207144 Mv(K3V) = 6.63 mag ; Koen10 d<25pc median K3V Mv(K3V) = 6.63 mag ; ter. stan. HD 128165 = GJ 556 Mv(K3V) = 6.62 mag ; median Mv K5V d<20pc XHIP Mv(K3V) = 6.61 mag ; V-Ks=2.41 => EEM fit to Jao16 data Mv(K3V) = 6.61 mag ; SIMBAD d<20pc trend for V-Ks=4.20 (M_Ks=4.21) Mv(K3V) = 6.60 mag ; V-Ks=2.41 => EEM fit to MS data Mv(K3V) = 6.6 mag ; Schmidt-Kaler82 Mv(K3V) = 6.60 mag ; M_Ks=4.20 (d<25pc;N=25), V-Ks=4.20 Mv(K3V) = 6.58 mag ; V-K=2.40 => EEM fit to Reid CNS3 data Mv(K3V) = 6.56 mag ; B-V=0.99 => Mv(Wright05) Mv(K3V) = 6.55 mag ; CATSUP -0.1<[Fe/H]<0.1 d<30pc for B-V=0.990 Mv(K3V) = 6.54 mag ; B-V=0.99 => EEM fit to SIMBAD dwarfs d<25pc Mv(K3V) = 6.53 mag ; median SIMBAD K3V d<25pc (N=45) Mv(K3V) = 6.53 mag ; pri. stan. HD 16160 = HR 753 ([Fe/H] ~ -0.12) Mv(K3V) = 6.52 mag ; Gray01/03/06 dwarfs, xHIP B-V/Mv, Gaspar16 |[Fe/H]|<0.05 "solar": fit for B-V=0.99 Mv(K3V) = 6.50 mag ; pri. stan. HD 219134 = HR 8832 ([Fe/H] ~ +0.05) Mv(K3V) = 6.50 mag ; trend for [Fe/H]=0.0 for standards & exemplars Mv(K3V) = 6.50 mag ; exemplar HD 114386 ([Fe/H] ~ -0.07) Mv(K3V) = 6.48 mag ; exemplar HD 122064 = HR 5256 Mv(K3V) = 6.47 mag ; Wegner07 Mv(K3V) = 6.43 mag ; sec. stan. HD 110463 = NP UMa (Ursa Major cluster) Mv(K3V) = 6.43 mag ; using Yee17 logT/logL/Rad data for [Fe/H], Teff=4860K Mv(K3V) = 6.32 mag ; ter. stan. HD 285690 = Cl Melotte 25 25 (Hyad) Mv(K3V) = 6.29 mag ; exemplar HD 125072 = GJ 542 ([Fe/H] = +0.26) => adopt Mv(K3V) = 6.60 mag [updated 1/27/2022] (M_Ks=4.20, V-Ks=2.40) => adopt M_G(K3V) = 6.28 mag [updated 1/27/2022] (Mv=6.60, G-V=-0.32) (Note: the trend in Mv for standards and exemplars is Mv = 6.495 - 0.485*[Fe/H] with rms = 0.113 mag) M_G(K3V) = 6.308 ; SIMBAD d<20pc trend for V-Ks=2.40 M_Ks(K3V) = 4.12 mag ; exemplar HD 114386 ([Fe/H] ~ -0.07) M_Ks(K3V) = 4.16 mag ; pri. stan. HD 219134 = HR 8832 ([Fe/H] ~ +0.05) M_Ks(K3V) = 4.18 mag ; ter. stan. HD 128165 = GJ 556 M_Ks(K3V) = 4.20 mag ; median K3V d<25pc N=25 M_Ks(K3V) = 4.21 mag ; SIMBAD d<20pc trend for K dwarfs for V-Ks=2.40 M_Ks(K3V) = 4.22 mag ; sec. stan. HD 110463 = NP UMa M_Ks(K3V) = 4.30 mag ; exemplar HD 207144 M_Ks(K3V) = 4.30 mag ; exemplar HD 39715 = GJ 223 ([Fe/H] ~ -0.10) M_Ks(K3V) = 4.33 mag ; exemplar HD 144872 ([Fe/H] ~ -0.48) => adopt M_Ks(K3V) = 4.20 mag [updated 1/27/2022] (Mv=6.60, V-Ks=2.40) logL(K3V) = -0.51+-0.03 ; Ecl binary CG Cyg B (Popper94) logL(K3V) = -0.554 ; Mv=6.50, BCv=-0.375 => Mbol = 6.125 => adopt logL(K3V) = -0.554 dex [last updated 12/15/2020] => adopt Mbol(K3V) = 6.125 mag [last updated 12/15/2020] Mass(K3V) = 0.81+-0.013 Msun ; Ecl binary CG Cyg B (Popper94) Mass(K3V) = 0.809 Msun ; EEM Mv vs. Mass fit for binaries (Mv=6.6) Mass(K3V) = 0.802 Msun ; Eker18 calibration for logL=-0.556 Mass(K3V) = 0.783 Msun ; EEM logL vs. Mass fit for binaries (logL=-0.556) Mass(K3V) = 0.777 Msun ; Eker15 calibration for logL=-0.556 Mass(K3V) = 0.760 Msun ; Mann18 calib for M_Ks=4.10 => adopt Mass(K3V) = 0.78 Msun [last updated 7/20/2020] Rad(K3V) = 0.84+-0.014 Rsun ; Ecl binary CG Cyg B (Popper94) Rad(K3V) = 0.801 Rsun ; pri. stan. HD 16160 = HR 753 = GJ 105A Rad(K3V) = 0.795+-0.006 Rsun ; pri. stan. HD 16160 = HR 753 = GJ 105A (Yee17) Rad(K3V) = 0.7867+-0.0006 Rsun ; Boyajian12b (N=2) Rad(K3V) = 0.778+-0.005 Rsun ; pri. stan. HD 219134 = HR 8832 (Yee17) Rad(K3V) = 0.777 Rsun ; pri. stan. HD 219134 = HR 8832 Rad(K3V) = 0.766+-0.058 Rsun ; exemplar HD 114386 (Stassun19) Rad(K3V) = 0.760+-0.030 Rsun ; sec. stan. HD 110463 (Yee17) Rad(K3V) = 0.760+-0.059 Rsun ; pri. stan. HD 16160 (Stassun19) Rad(K3V) = 0.7547 Rsun ; Teff=4830K, logL=-0.554 Rad(K3V) = 0.751+-0.058 Rsun ; pri. stan. HD 219134 (Stassun19) Rad(K3V) = 0.749+-0.054 Rsun ; ter. stan. HD 285690 (Stassun19) Rad(K3V) = 0.739+-0.060 Rsun ; exemplar HD 122064 (Stassun19) Rad(K3V) = 0.738+-0.045 Rsun ; ter. stan. HD 128165 (Stassun19) Rad(K3V) = 0.733+-0.052 Rsun ; sec. stan. HD 110463 (Stassun19) Rad(K3V) = 0.710+-0.048 Rsun ; exemplar HD 207144 (Stassun19) Rad(k3V) = 0.699+-0.041 Rsun ; exemplar HD 144872 (Stassun19) Rad(K3V) = 0.695+-0.056 Rsun ; exemplar HD 39715 (Stassun19) Rad(K3V) = 0.690+-0.030 Rsun ; exemplar HD 144872 (Yee17) => adopt Rad(K3V) = 0.755 Rsun [last updated 12/28/2020] For Hipparcos K3V stars within 75pc, parallax S/N > 8, and within 1 mag of the main sequence (N=155): (K3V) = 1.806 (+-0.016 sem, +-0.138 stdev; N=155) (K3V) = 2.290 (+-0.013 sem, +-0.176 stdev; N=155) (K3V) = 0.482 (+-0.004 sem, +-0.049 stdev; N=155) (K3V) = 0.126 (+-0.002 sem, +-0.030 stdev; N=155) (K3V) = 1.162 (+-0.010 sem, +-0.101 stdev; N=154) (K3V) =-0.106 (+-0.003 sem, +-0.038 stdev; N=154) (K3V) = 3.396 (+-0.022 sem, +-0.247 stdev; N=155) # No standard Houk75 and Morgan65 do not list a K3V standard # Primary Standards HD 219134 = HR 8832 = GJ 892 = HIP 114622 = LHS 71 = LTT 16826 = STT 599A = WDS J23133+5710A *K3V: Morgan38,Keenan40,MK43,Nassau47,JM53,Wilson62,Cowley67,Keenan80,Kennedy83,Keenan83,Keenan85,Bidelman85(K3),Keenan88,Keenan89,Gray03 K4V: 1972AbaOB..43..109W K5V: 1927MeUpp..28....1L,Adams35,1953UppAn...3h....W K5III: 1954UppAn...4a...1M Skiff lists HR 8832 as being the only K3V star from MK43. MK43 lists "S 7259" as its K3V standard. I can find no identifier in the SIMBAD database entry for HR 8832 which uses the index "8832". "S 7259" is probably not "HR 7259" (Bet CrA), as that star is listed as "G3II" in 1937AnHar.105...45H and K0II/IIICNIb in Houk82, and is not a nearby dwarf. I'm not absolutely sure whether MK43 was referring to this star or not. Regardless, HR 8832 appears to be a good standard. Has 6 (maybe 7?) exoplanet candidates. V=5.57(HIP,Johnson66), V=5.567+-0.010(Mermillliod91), B-V=1.000+-0.000(HIP), B-V=1.00(Johnson66), B-V=0.994+-0.009(Mermilliod91), V-I=1.04(HIP), U-B=0.88(Johnson66),U-B=0.894+-0.010(Mermilliod91), saturated in 2MASS. Morel78 lists 3 K magnitudes (3.18,3.23,3.27), I adopt the median K=3.23, hence (V-Ks)=2.34, which is probably within +-0.05 mag of the Johnson-2MASS system. PASTEL compendium: = 4830K(N=25), =4.56(N=17), <[Fe/H]>=+0.05(N=18). Boyajian12 reports R = 0.7784+-0.0053 Rsun, fbol = (19.850+-0.086)e-8 erg/cm/s => IAU2015 mbol = 5.2581 +- 0.0047. BCv = mbol - V = 5.2581+-0.0047 - 5.57+-0.01 = -0.312 +- 0.011. tetLD=1.106+-0.007mas(Boyajian12), plx= 153.0808+-0.0895mas(GaiaDR2) => 0.777Rsun. Mv=6.50, M_Ks=4.155. HD 16160 = HR 753 = GJ 105A *K3V: Morgan38,Roman55,Wilson62,1972AbaOB..43..109W,KeenanMcNeil76(stan),Kennedy83,Bidelman85(K3),Keenan99,Houk(sec. stan.),GrayNstars,Gray03,Gray06,Tamazian06,Pecaut13 K3-V: Keenan89 K4V: Adams35,JM53(non-stan,"dK4") K5V: Morgan37 Skiff compendium shows 9 references since Morgan38 all list it as K3V or K3. Gray uses it as "the" K3V Nstars standard. Note that there is no "Gl 105" or "GJ 105" in SIMBAD, it is "105A". GJ 105C is a V=16.77 M7V star at separation 3.3" from A (Nidever02 reports that 105A is a stable RV star to within <0.1 km/s). GJ 105B is a V=11.66 M4V star at separation 165" (2.8'). V=5.79(HIP), V=5.823+-0.010(Mermilliod91, Nobs>99), V=5.82(Johnson66), B-V=0.970+-0.010(Mermilliod91, Nobs>99), B-V=0.918+-0.019(HIP), B-V=0.97(Johnson66), U-B=0.802+-0.015(Mermilliod91), U-B=0.80(Johnson66), V-I=1.06(HIP). 2MASS photometry saturated. Pecaut13 estimates mbol=5.406+-0.015 from SED fitting to BT-Settl models, hence BCv = mbol - Vmag = 5.406 - 5.823 = -0.417. Boyajian12 reports fbol = (16.680 ± 0.103)e-8 erg/cm2/s) => => IAU2015 scale mbol = 5.4470 +- 0.0067, BCv = mbol - V = 5.447 - 5.823 = -0.376 +- 0.012. PASTEL: =4861K(N=18), =4.60(N=13), <[Fe/H]>=-0.12(N=13). plx = 139.27+-0.45 mas(HIP2), plx=138.2084+-0.1436mas(GaiaDR2). tetLD=1.030+-0.007mas(Boyjian12) & GaiaDR2 => R=0.801Rsun. The magnitude difference between the 3" binary GJ 105A and 105C is 10.84 magnitudes in V (factor of ~22,000), so GJ 105A should be OK as a "K3V" standard. Mv=6.53. # Secondary Standard HD 110463 = NP UMa = GJ 3743 *K3V: Roman49(K3Ve),JM53,Morgan53,Wilson62,Jaschek64(all),Levato78 K2V: Joy49,Yoss61 Nuclear Ursa Major cluster member. V=8.27(HIP), V=8.273+-0.007(Mermilliod91), B-V=0.955(HIP), B-V=0.955+-0.004(Mermilliod91), U-B=0.757+-0.059(Mermilliod91), V-I=1.00(HIP), J=6.569+-0.029(2MASS), H=6.113+-0.029(2MASS), K=6.003+-0.017(2MASS), V-J=1.701(HIP,2MASS), V-H=2.157(HIP,2MASS), (V-Ks)=2.267(HIP,2MASS), Teff=4950K(Mishenina08, Soubiran10). Seems to be just slightly bluer and hotter than the other K3V standards. PASTEL compendium: =4926K(N=5), =4.50(N=5), <[Fe/H]>=-0.05(N=5). plx=44.0100+-0.0218mas(GaiaEDR3). Mv=6.49, M_Ks=4.22. # Tertiary Standard HD 128165 = GJ 556 = HIP 71181 (J1433+5254; V=7.2) *K3V: JM53,Wilson62,Bidelman85(K3) K5V: Adams35 A rare solar metallicity K-type standard, but have not seen mentioned as a K3V standard since Wilson62. V=7.219(Hauck97), V=7.23(Mermilliod91), V=7.24(HIP), V=7.25(TYC), B-V=0.990(Mermilliod91), B-V=0.997+-0.018(HIP), B-V=1.017+-0.010(TYC), U-B=0.84(Mermilliod91), V-I=1.04(HIP), 2MASS H and K bands are good: H=4.872+-0.029(2MASS), K=4.789+-0.017(2MASS). V-H=2.368(HIP,2MASS), (V-Ks)=2.451(HIP,2MASS). Teff=4755K(Luck05,Luck06), 4792+-70K(Kotoneva06), 4809+-44K(Valenti05). PASTEL: = 4793K(N=6), <[Fe/H]>=0.00(N=5), =4.56(N=5). Parameters seem similar to the other K3V standards. The only issue is that this star has not been used much as a standard since Johnson & Morgan 1953. Mv=6.62, M_Ks=4.18. GaiaEDR3: plx=75.5689+-0.0151mas. Bp-Rp=1.213392, Bp-G=0.529290, G-Rp= 0.684102, Gcor=6.919+-0.003. G-V = 6.919 - 7.24 = -0.321. HD 285690 = Cl Melotte 25 25 = HIP 20082 = V985 Tau = BD+15 609 (Hyad) K0: Nesterov95,Schwassman51 *K3V: Wilson62(K3),Corbally86(stan,Morgan65) K4V: Adams35 No published classifications since Morgan65, although Corbally86 used it as a K3V standard. Hyad, so slightly metal-rich. V=9.595+-0.013(Mermilliod91), B-V=0.983+-0.011(Mermilliod91), U-B=0.806+-0.004(Mermilliod91), Ks=7.322+-0.017(2MASS), V-Ks= 9.595-7.322 = 2.273. PASTEL median values: Teff = 4919K(N=6), logg=4.60, [Fe/H]=0.11(N=4). GaiaDR2: plx=22.1353+-0.0421mas, G=9.2871+-0.0005, E(BR/RP)=1.216, Bp-Rp=1.1537, Bp-G=0.5213, G-Rp=0.6324. Mv=6.320+-0.014, M_G=6.013+-0.004, M_Ks=4.047+-0.017. # Deprecated standard HD 223778 = HR 9038 = Gl 909 K2: Cannon *K3V: Nassau47,Wilson62,Jaschek64,Jaschek78,Bartaya79,Abt85,Keenan85,Keenan89,Gray03 K5V: Adams35 All references in Skiff09 after 1935 call it K3V. V=6.36(HIP), B-V=0.977(HIP), V-I=1.10+-0.06(HIP), 2MASS photometry is saturated. Star is a 3.0-5.5" binary with components V(A)=6.6 and V(B)=11.5. Barbera93 lists the companion as a "M2" but Docobo06 lists the secondary as a K9V+M4V SB2 (hence it is a triple system). Luck05 reports "lines double" in his spectrum of HR 9038. So perhaps this is not a prime standard star given that its unresolved light maybe coming from three different stellar types. HD 34673 = GJ 200A = G 84-45 *K3V: Roman55,Wilson62,Upgren72,McNeil86,Keenan89,Keenan99,Gray03 K4: Bidelman85 K5V: Adams35 PASTEL values: Teff=4762K(N=2), [Fe/H]=-0.21+-0.10(Bensby14). Companion B is 3" away (M2 type), delta(V)=3.43. Unresolved photometry: V=7.764+-0.017(Mermilliod91), B-V=1.045+-0.006(Mermilliod91), U-B=0.863+-0.025(Mermilliod91), Ks=5.046+-0.016(2MASS), V-Ks = 7.764-5.046 = 2.718. Colors show that the effects of the M companion are affecting the photometry. # Exemplars HD 207144 = GJ 9754 = HIP 107625 *K3V: Evans65,Upgren72,Houk78(Pecaut16=>K3V),Bidelman85(K3),Gray06 In Skiff MK compendium (3/2018), all five classifications agree on K3V. V=8.632+-0.018(Mermilliod91), B-V=0.960+-0.008(Mermilliod91), U-B=0.740+-0.056(Mermilliod91), Ks=6.241+-0.018(2MASS), V-Ks = 8.632 - 6.241 = 2.391. Teff=4868K(Hinkel17), 4885K(Mortier13) => = 4877K. Mv=6.75. No metallicity estimates. plx=40.8138+-0.0202mas(GaiaEDR3) => Mv=6.69, M_Ks=4.30. HD 114386 = HIP 64295 *K3V: Upgren72,Houk82,Gray06 In Skiff MK compendium, all three classifications agree K3V. V=8.73(HIP), B-V=0.982+-0.003(HIP), V-I=1.03, Ks=6.351+-0.018(2MASS), V-Ks = 8.73 - 6.351 = 2.379. PASTEL median values: = 4820K(N=7), logg=4.37(N=7), [Fe/H]=-0.07(N=7). Exoplanet b has P=937.7d, Msini=1.36 Mjup. plx=35.7355+-0.0200mas(GaiaEDR3) => Mv=6.50, M_Ks=4.12. HD 144872 = GJ 612 = HIP 78913 = AT CrB = LHS 3153 *K3V: Roman55,Wilson62,Bidelman85(K3),Gray03 K5V: Adams35 AAVSO lists P=26.02 days, amplitude 0.02mag. V=8.622+-0.013(Mermilliod91), B-V=0.960+-0.000(Mermilliod91), U-B=0.724+-0.009(Mermilliod91), Ks=6.162+-0.021(2MASS), V-Ks=2.46. PASTEL median values: Teff = 4793K(N=4). Gaspar16 lists <[Fe/H]>=-0.48+-0.06. plx=43.0188+-0.0164mas(GaiaEDR3) => Mv=6.79, M_Ks = 4.33. HD 39715 = GJ 223 = UGP 128 K2V: Upgren72 *K3V: Jaschek78,Houk99,Gray03 V=8.837+-0.005(Mermilliod91), B-V=1.017+-0.005(Mermilliod91), U-B=0.867+-0.019(Mermilliod91), Ks=6.352+-0.024(2MASS), V-Ks = 8.837 - 6.352 = 2.485. PASTEL median values: Teff = 4783K(N=4), logg=4.66(N=2), [Fe/H]=-0.10(N=3). plx=38.9276+-0.0193mas(GaiaEDR3) => Mv=6.79, M_Ks=4.30. HD 122064 = HR 5256 = HIP 68184 = LTT 14084 = G 239-8 K2: Wilson53(GCRV),Abt72 *K3V: BSC(Hoffleit91),Malaroda06,Lee84(K3) K4V: Lindblad34 K5: Cannon(HD),SAO,Luyten79 Relatively poorly studied nearby K dwarf in BSC/HR catalog at *10 pc* oddly missing from Gliese catalog, perhaps due to low proper motion (219 mas/yr). B-V=1.040+-0.006(HIP), V-I=1.01+-0.01(HIP), V=6.49(HIP), Mv=6.47(HIP,GaiaDR2). 2MASS photometry is corrupted (DCF flags). PASTEL: = 4894K(N=10), =4.58(N=8), <[Fe/H]> = +0.16(N=8). plx=99.2285+-0.0232mas (GaiaDR2; d=10.078+-0.002 pc), plx=98.97+-0.56(HIP), plx=99.3325+-0.0193mas(GaiaEDR3) => Mv=6.48. HD 125072 = GJ 542 = HIP 69972 = LHS 2892 K0: Cannon *K3V: Schade53(K3),Evans57,Houk75,Jaschek64(all) K3IV: Gray06 K3-5: Sundman74 K3-K5: Loden76 Good agreement on K3 subtype. Clearly a metal-rich dwarf based on HRD (Mv=6.30, ~0.44 mag above MS) and spectroscopic loggs (logg=4.5) and [Fe/H] ~ +0.26 (see PASTEL values below). V=6.66(HIP), V=6.652+-0.011(Mermilliod91), B-V=1.017+-0.032(HIP), B-V=1.029(Just08), B-V=1.033+-0.009(Mermilliod91), U-B=0.936+-0.012(Mermilliod91), V-Ic=1.02+-0.02(HIP), V-Rc=0.565(Just08), Rc-Ic=0.454(Just08). plx=84.6029+-0.0218mas(GaiaEDR3) => Mv=6.289+-0.011(Mermilliod91,GaiaEDR3). 2MASS photometry is poor. PASTEL median values: Teff = 4907K(N=13), logg=4.53(N=11), [Fe/H]=+0.26(N=11). Rimoldini12 lists it as variable with period logPer=-1.3657 d =>0.043 d => 62.0 minutes, with amplitude 10^-1.73 mag => 0.0186 mag. Their random forest analysis predicts it as "RS+BY_X". But this would be surprising given the low activity (logR'HK=-4.93; GomesdaSilva21,Meunier22). Hojjatpanah20 estimates rotation period Prot=13.6+-2.8d. # Variant Standards HD 160346 = GJ 688 = HIP 86400 K0: Cannon K2V: 1967PDDO....2..479H,Houk99 K2.5V: Gray03 *K3-V: Keenan83(stan),Keenan89(non-stan) K3V: Wilson50,Wilson62,Bidelman85("str. D"). Seems to be a fairly well-characterized solar-metallicity star with good agreement among authors that type is between K2V and K3V and recent K2.5V classification by Gray03. SB1 with M-type companion on 84d orbit. Bidelman85 notes strong Na D line. V=6.53(HIP), B-V=0.959+-0.006(HIP). PASTEL: Teff=4920K(N=8), [Fe/H]=-0.02(N=5). Gray03 listed Teff=4801K. plx = 99.1391+-1.2260mas(GaiaDR2), Mv=6.51+-0.03. G = 6.2004+-0.0004(GaiaDR2), Bp-Rp=1.1890, Bp-G=0.5452, G-Rp=0.6439. # Other Stars HD 263175 = HIP 32423 K2: Bidelman85 *K3V: Cowley67,Gray03 M1 companion 30" away, 4 mags fainter. V=8.777+-0.033(Mermilliod91), B-V=0.964+-0.009(Mermilliod91), U-B=0.720+-0.014(Mermilliod91), Ks=6.417+-0.018(2MASS), V-Ks = 8.777-6.417 = 2.36. PASTEL median values: Teffs = 4760K(N=6), logg=4.57(N=4), [Fe/H]=-0.20(N=4). HD 215152 = GJ 4291 *K3V: Houk99,Gray03 V=8.14(Mermilliod91), B-V=0.970(Mermilliod91), U-B=0.790(Mermilliod91), Ks=5.775+-0.026(2MASS), V-Ks = 8.14 - 5.775 = 2.365. PASTEL median values: Teff = 4865K(N=4), logg=4.33(N=2), [Fe/H]=-0.09(N=2). HR 6426 = GJ 667 AB = LHS 443 = HD 156384 K3V: Wilson62,Upgren72 *K3V+K4V: Corbally84(K3.5V unresolved) K3+K4: Bidelman85 K4-V: Gray06 K4V: Houk72,Bidelman85(K4) K5V: Adams35 2" binary with ternary M1.5V companion 33" away (GJ 667C). Corbally84 and Bidelman85/Kuiper independently agree on subtypes of components. HD 222237V: Evans57 K3V: Sahade53(K3),Evans57 *K3+V: Gray06 K4V: Houk75 HD 160346 = GJ 688 K0: Cannon K2V: 1967PDDO....2..479H,Houk99 K2.5V: Gray03 *K3-V: Keenan83(stan),Keenan89(non-stan) K3V: Wilson50,Wilson62,Bidelman85("str. D"). Seems to be a fairly well-characterized solar-metallicity star with good agreement among authors that type is between K2V and K3V and recent K2.5V classification by Gray03. SB1 with M-type companion on 84d orbit. Bidelman85 notes strong Na D line. V=6.53(HIP), B-V=0.959+-0.006(HIP). PASTEL: Teff=4920K(N=8), [Fe/H]=-0.02(N=5). Gray03 listed Teff=4801K. plx = 99.1391+-1.2260mas(GaiaDR2), Mv=6.51+-0.03. G = 6.2004+-0.0004(GaiaDR2), Bp-Rp=1.1890, Bp-G=0.5452, G-Rp=0.6439. HD 160346 = GJ 688 = HIP 86400 K0: Cannon K2V: 1967PDDO....2..479H,Houk99 K2.5V: Gray03 *K3-V: Keenan83(stan),Keenan89(non-stan) K3V: Wilson50,Wilson62,Bidelman85("str. D"). Seems to be a fairly well-characterized solar-metallicity star with good agreement among authors that type is between K2V and K3V and recent K2.5V classification by Gray03. SB1 with M-type companion on 84d orbit. Bidelman85 notes strong Na D line. V=6.53(HIP), B-V=0.959+-0.006(HIP). PASTEL: Teff=4920K(N=8), [Fe/H]=-0.02(N=5). Gray03 listed Teff=4801K. plx = 99.1391+-1.2260mas(GaiaDR2), Mv=6.51+-0.03. G = 6.2004+-0.0004(GaiaDR2), Bp-Rp=1.1890, Bp-G=0.5452, G-Rp=0.6439.