K6V GJ 529 appears to be the primary standard. K6V is often not considered a full subtype. Keenan84 does not list K6 as a full subtype like K5 and M0, and "other possible subdivisions are utilized only for interpolation whenever we think that we can classify accurately enough to justify their use. Thus when we call a star G3 we mean only that it is closer to G2 than to G5." Joy47 used K6 as a single subtype step between K5 and M0 (and no K7/K8/K9). Kuiper42 used all ten subdivisions for type K, including K6. Keenan88 standard: Gl 529 (=HD 120467) - K6Va Keenan89 standards: Gl 529 (=HD 120467) - K6Va Gl 830 (=HD 88230) - K6Ve Fe-1 GrayNstars standard: Gl 529 (=HD 102467) - K6Va Skiff08 flags two stars as K6V MK standards, both from Keenan89: HD 120467 and HD 88230. The brightest K6Vs were HIP 48331 (V=7.67) and HIP 3588 (V=7.89). Two stars tied for having the median B-I color: HIP 45251 and HIP 66918 with (B-I = 2.637). There is only one K6V star in the Hipparcos catalog within 75 pc, parallax S/N > 8 and within 1 mag of the main sequence (HIP 6290), with B-V(K6V)=1.340. Upgren72 classified only 2 stars as K6V: UGP 39 (a late K/M binary) and UGP 539. Neither seems to be a good exemplar of the subtype as there seems to be little agreement on classification among other classifiers. (B-V)(K6V) = 1.30 ; 1 Hyad from Wilson62(N=1) (B-V)(K6V) = 1.286 ; median Koen10 d<25pc K6V (B-V)(K6V) = 1.271 ; median SIMBAD K6V d<25pc (N=38) (B-V)(K6V) = 1.27 ; median for N=36 K6Vs within 30pc (Hinkel17) (B-V)(K6V) = 1.261 ; pri. stan. GJ 529 (B-V)(K6V) = 1.253 ; exemplar HIP 11739 = BD-20 470 (B-V)(K6V) = 1.242 ; Gray01/03/06 K6V (+-0.008 sem, +-0.059 stdev) (B-V)(K6V) = 1.24 ; exemplar HD 72928 (B-V)(K6V) = 1.24 ; Schmidt-Kaler82 halfway between K5V(1.15) & K7V(1.33) (B-V)(K6V) = 1.237 ; exemplar GJ 412.3 = GJ 9347 (B-V)(K6V) = 1.232 ; exemplar GJ 249 (B-V)(K6V) = 1.229 ; exemplar GJ 818 (B-V)(K6V) = 1.194 ; exemplar GJ 39 (B-V)(K6V) = 1.160 (+-0.085 sem,+-0.148 stdev); 3 ARICNS K6V stars => adopt (B-V)(K6V) = 1.24 *** [last updated 8/13/2020] => adopt (Bt-Vt)(K6V) = 1.439 => adopt (U-B)(K6V) = 1.184 => adopt (V-R)(K6V) = 0.759 => adopt (R-I)(K6V) = 0.662 => adopt (V-J)(K6V) = 2.395 => adopt (V-H)(K6V) = 2.995 => adopt (H-Ks)(K6V) = 0.148 => adopt (J-H)(K6V) = 0.601 => adopt (V-Hp)(K6V) = -0.114 => adopt (Bp-Rp)(K6V) = 1.565 => adopt (Bp-G)(K6V) = 0.759 => adopt (G-Rp)(K6V) = 0.818 (Ks-W1)(K6V) = 0.101 ; EEM trend for d<30pc for B-V=1.24 => adopt (Ks-W1)(K6V) = 0.101 [updated 12/29/2019] (V-Ks)(K5V) = 2.88 ; adopted K5V (V-Ks)(K6V) = 2.985 ; exemplar GJ 39 (V-Ks)(K6V) = 2.992 ; exemplar GJ 818 (V-Ks)(K6V) = 3.00 ; pri. stan. GJ 529 (V-Ks)(K6V) = 3.05 ; trend for K6V standard/exemplars [Fe/H] vs. V-Ks (for [Fe/H]=0.0) (V-Ks)(K6V) = 3.075 ; exemplar HIP 11739 = BD-20 470 (V-Ks)(K6V) = 3.083 ; exemplar GJ 249 (V-Ks)(K6V) = 3.089 ; trend for K dwarf standards/exemplars (V-Ks)(K6V) = 3.115 ; halfway K5V(2.88),K7V(3.35) (V-Ks)(K6V) = 3.143 ; trend for B-V=1.24 (V-Ks)(K6V) = 3.188 ; exemplar GJ 412.3 = GJ 9347 (V-Ks)(K6V) = 3.217 ; exemplar HD 72928 (V-Ks)(K7V) = 3.35 ; adopted K7V => adopt (V-Ks)(K6V) = 3.08 [updated 12/15/2020] => adopt (G-Ks)(K6V) = 2.57 = (3.08 + -0.51) [updated 12/23/2020] (Bp-Rp)(K5V) = 1.45 ; K5V mean (Bp-Rp)(K6V) = 1.4925 ; exemplar GJ 39 (Bp-Rp)(K6V) = 1.5067 ; exemplar GJ 818 (Bp-Rp)(K6V) = 1.5187 ; pri. stan. GJ 529 (Bp-Rp)(K6V) = 1.5306 ; exemplar GJ 249 (Bp-Rp)(K6V) = 1.5430 ; exemplar HIP 11739 = BD-20 470 (Bp-Rp)(K6V) = 1.5786 ; exemplar GJ 412.3 = GJ 9347 (Bp-Rp)(K6V) = 1.591 ; exemplar HD 72928 (Bp-Rp)(K7V) = 1.71 ; K7V mean => adopt (Bp-Rp)(K6V) = 1.53 [updated 8/13/2020] (G-Rp)(K5V) = 0.74 ; K5V mean (G-Rp)(K6V) = 0.7816 ; exemplar GJ 39 (G-Rp)(K6V) = 0.7883 ; exemplar GJ 818 (G-Rp)(K6V) = 0.7917 ; pri. stan. GJ 529 (G-Rp)(K6V) = 0.7947 ; exemplar GJ 249 (G-Rp)(K6V) = 0.8013 ; exemplar HIP 11739 = BD-20 470 (G-Rp)(K6V) = 0.8213 ; exemplar GJ 412.3 = GJ 9347 (G-Rp)(K6V) = 0.8220 ; exemplar HD 72928 (G-Rp)(K7V) = 0.87 ; K7V mean => adopt (G-Rp)(K6V) = 0.795 [updated 8/13/2020] => adopt (Bp-G)(K6V) = 0.735 [updated 8/13/2020; Bp-Rp=1.53, G-Rp=0.795] (G-V)(K6V) = -0.461 ; exemplar GJ 818 (G-V)(K6V) = -0.467 ; from color fit for B-V=1.24 (G-V)(K6V) = -0.4677 ; exemplar GJ 39 (G-V)(K6V) = -0.477 ; pri. stan. GJ_529 (G-V)(K6V) = -0.486 ; trend for SIMBAD d<20pc for V-Ks=3.08 (G-V)(K6V) = -0.512 ; interp K5V(B-V=1.15,G-V=-0.45),K7V(B-V=1.34,G-V=-0.58) for B-V=1.24 (G-V)(K6V) = -0.520 ; exemplar GJ 412.3 = GJ 9347 (G-V)(K6V) = -0.533 ; exemplar GJ 249 (G-V)(K6V) = -0.537 ; exemplar HIP 11739 = BD-20 470 (G-V)(K6V) = -0.5648 ; exemplar HD 72928 => adopt (G-V)(K6V) = -0.51 [updated 12/10/2020] => adopt (G-Ks)(K6V) = 7.04 - 4.51 = 2.53 [updated 12/15/2020] (V-Ic)(K6V) = 1.20 ; exemplar HD 72928 (V-Ic)(K6V) = 1.32 ; exemplar GJ 39 (V-Ic)(K6V) = 1.36 ; exemplar GJ 818 (V-Ic)(K6V) = 1.39 ; exemplar GJ 249 (V-Ic)(K6V) = 1.391 (+-0.018 sem, +-0.114 stdev; N=50) Gray01/03/06 (V-Ic)(K6V) = 1.40 ; pri. stan. GJ 529 (V-Ic)(K6V) = 1.42 ; exemplar HIP 11739 = BD-20 470 (V-Ic)(K6V) = 1.420 ; trend, from B-V=1.24 (V-Ic)(K6V) = 1.445 (+-0.018 sem, +-0.084 stdev; N=17) Koen10 (V-Ic)(K6V) = 1.47 ; exemplar GJ 412.3 = GJ 9347 => adopt (V-Ic)(K6V) = 1.40 [updated 8/13/2020] (g-r)(K6V) = 1.108 ; Jordi06 (V-R)=>(g-r) for V-R=0.759 (g-r)(K6V) = 1.142 ; Bilir05 (B-V)=>(g-r) for B-V=1.240 (g-r)(K6V) = 1.26 ; Covey07 interp K5V-K7V => adopt (g-r)(K6V) = 1.14 [updated 10/10/2020] Teff(K6V) = 4444 K ; exemplar GJ 818 median Teff(K6V) = 4356 K ; pri. stan. GJ 529 (median, but metal rich!) Teff(K6V) = 4342 K ; exemplar GJ 39 median Teff(K6V) = 4320 K ; median of 17 published Teffs for K6V stars Teff(K6V) ~ 4300 K ; trend of [Fe/H] vs. Teff for standard+exemplars Teff(K6V) = 4285 K ; exemplar HIP 11739 = BD-20 470 Teff(K6V) = 4273 K ; smooth Teff(SpT) trend Teff(K6V) = 4271 K ; exemplar GJ 412.3A = GJ 9347 Teff(K6V) = 4270 K ; interp K5V(T=4440K)and K7V(T=4100K) Teff(K6V) = 4257 K ; exemplar HD 72928 Teff(K6V) = 4232 K ; Morrell19 Teff for stars w/i +-0.1 mag of M_Ks=4.58 Teff(K6V) = 4224 K ; exemplar GJ 249 = HD 49601 ([Fe/H] ~ -0.15) Teff(K6V) = 4223 K ; Boyajian12 calibration for V-Ks=3.08 Teff(K6V) = 4205 K ; Schmidt-Kaler82 halfway between K5V(4350) and K7V(4060) Teff(K6V) = 4030 K ; deprecated stan. GJ 380 => adopt Teff(K6V) = 4300 K (logT = 3.633) [updated 12/15/2020] Mv(K6V) = 7.15 mag ; exemplar GJ 412.3 = GJ 9347 Mv(K6V) = 7.38 mag ; exemplar GJ 818 Mv(K6V) = 7.42 mag ; pri. stan. GJ 529 Mv(K6V) = 7.48 mag ; trend for standards & exemplars: Mv=7.044+0.35014*(B-V)(rms=0.19mag) for B-V=1.24 Mv(K6V) = 7.49 mag ; exemplar GJ 39 Mv(K6V) = 7.53 mag ; [Fe/H] vs. Mv for standards+exemplars for [Fe/H]=0.0 Mv(K6V) = 7.55 mag ; M_G=7.04, G-V=-0.51 Mv(K6V) = 7.59 mag ; B-V=1.24 => Mv(Wright05) Mv(K6V) = 7.59 mag ; exemplar HD 72928 Mv(K6V) = 7.60 mag ; M_Ks=4.5, V-Ks=3.1 (from [Fe/H] vs. M_Ks trend for [Fe/H]=0.0) Mv(K6V) = 7.62 mag ; smoothed trend for K dwarfs V-Ks vs. Mv for V-Ks=3.08 Mv(K6V) = 7.63 mag ; Wegner07 Mv(K6V) = 7.64 mag ; exemplar GJ 249 Mv(K6V) = 7.64 mag ; smooth fit to K/M sequence for V-Ks=3.08 Mv(K6V) = 7.64 mag ; exemplar HIP 11739 = BD-20 470 Mv(K6V) = 7.66 mag ; B-V=1.24 => EEM fit to SIMBAD dwarfs d<25pc Mv(K6V) = 7.68 mag ; V-K=3.08 => Mv(JohnsonApps09) Mv(K6V) = 7.68 mag ; SIMBAD d<20pc trend for K dwarfs for V-Ks=3.08 Mv(K6V) = 7.69 mag ; interp K5V (B-V=1.15,7.28), K7V (B-V=1.34, Mv=8.15) for B-V=1.24 Mv(K6V) = 7.69 mag ; V-K=3.08 => EEM fit to Reid CNS3 data Mv(K6V) = 7.72 mag ; V-K=3.08 => EEM fit to Jao16 Mv(K6V) = 7.75 mag ; Schmidt-Kaler82 halfway between K5V(7.4) and K7V(8.1) Mv(K6V) = 7.75 mag ; EEM fit to well-defined K4V-K7V trend d<25pc Mv(K6V) = 7.76 mag ; median Koen10 d<25pc K6V Mv(K6V) = 7.86 mag ; median SIMBAD K6V d<25pc (N=38) Mv(K6V) = 8.29 mag ; Henry94 relation => adopt Mv(K6V) = 7.64 mag [updated 3/2/2021] (M_Ks=4.56, V-Ks=3.08) => adopt M_G(K6V) = 7.13 mag [updated 3/2/2021] (Mv=7.64, G-V=-0.51) => adopt M_Ks(K6V) = 4.56 mag [updated 3/2/2021] (Mv=7.64, V-Ks=3.08) M_G(K6V) = 6.633 ; exemplar GJ 412.3 = GJ 9347 M_G(K6V) = 6.922 ; exemplar GJ 818 M_G(K6V) = 6.943 ; pri. stan. GJ 529 M_G(K6V) = 7.020 ; exemplar GJ 39 M_G(K6V) = 7.027 ; exemplar HD 72928 M_G(K6V) = 7.04 ; trend [Fe/H] vs. M_G for [Fe/H]=0.0 M_G(K6V) = 7.102 ; exemplar GJ 249 M_G(K6V) = 7.105 ; exemplar HIP 11739 = BD-20 470 M_Ks(K6V) = 4.67 ; median K6V d<25pc N=34 M_Ks(K6V) = 4.60 ; SIMBAD d<20pc trend for K dwarfs for V-Ks=3.08 M_Ks(K6V) = 4.57 ; exemplar HIP 11739 = BD-20 470 M_Ks(K6V) = 4.54 ; exemplar GJ 249 = HD 49601 M_Ks(K6V) = 4.51 ; trend for exemplars for [Fe/H]=0.0 M_Ks(K6V) = 4.50 ; exemplar GJ 39 = HD 4913 M_Ks(K6V) = 4.42 ; pri. stan. GJ 529 = HD 120467 M_Ks(K6V) = 4.42 ; exemplar GJ 818 = HD 200779 M_Ks(K6V) = 4.37 ; exemplar HD 72928 = StKM 1-709 M_Ks(K6V) = 3.96 ; exemplar GJ 412.3A = GJ 9347 (binary?) BCv(K6V) = -0.839 mag ; Masana06(Teff=4300K, set so BCv(5772K)=-0.085) BCv(K6V) = -0.767 mag ; Flower96(Teff=4300K, set so BCv(5772K)=-0.085) BCv(K6V) = -0.748 mag ; EEM fit to Casagrande06/08/10 data (Teff=4300K, set so BCv(5772K)=-0.085) BCv(K6V) = -0.751 mag ; Morrelli19 calib for G-Ks=2.57 & adopting V-Ks=3.08 BCv(K6V) = -0.745 mag ; Bessell98(ATLAS9,logg=4.5,Teff=4300K, set so BCv(5772K)=-0.085) BCv(K6V) = -0.743 mag ; Casagrande18(Teff=4300K,logg=4.5, set so BCv(5772K)=-0.085) BCv(K6V) = -0.686 mag ; Bertone04(ATLAS,Teff=4300K, set so BCv(5772K)=-0.085) BCv(K6V) = -0.735 mag ; Schmidt-Kaler82 halfway K5V(-0.72) & K7V(-1.01) + 0.13 offset => adopt BCv(K6V) = -0.75 mag [updated 12/23/2020; adjusted so that BCv(5772K)=-0.085] BC_Ks(K6V) = 2.329 mag ; Morrelli19 for G-Ks=2.57 logL(K6V) = -0.860 dex ; Mv=7.64, BCv=-0.75 => Mbol = 6.890 => adopt logL(K6V) = -0.860 dex [updated 3/2/2021] => adopt Mbol(K6V) = 6.890 mag [updated 3/2/2021] Rad(K6V) = 0.76 +- 0.06 Rsun ; exemplar GJ 818 Rad(K6V) = 0.6756 Rsun ; logL=-0.852, Teff=4300K => adopt Rad(K6V) = 0.669 Rsun [updated 3/2/2021] Mass(K6V) = 0.751 Msun ; Delfosse10 calibration for M_Ks=4.56 Mass(K6V) = 0.691 Msun ; EEM Mv vs. Mass fit for binaries (Mv=7.64) Mass(K6V) = 0.690 Msun ; EEM logL vs. Mass fit for binaries (logL=-0.860) Mass(K6V) = 0.683 Msun ; Eker18 calibration for logL=-0.86 Mass(K6V) = 0.673 Msun ; Eker15 calibration for logL=-0.86 Mass(K6V) = 0.663 Msun ; Mann18 calib for M_Ks=4.56 => adopt Mass(K6V) = 0.68 Msun [updated 3/2/2021] # No Standard JM53, Wilson62, Houk75, KeenanMcNeil76, Keenan85, Corbally86, Kirkpatrick91, GrayNstars, Henry02 do not list any K6V standard. # Primary Standard GJ 529 = HD 120467 = BD-21_3781 = HIP 67487 = LHS 363 (J1349-2206) K4V: Popper43 K5V: Upgren72,Stephenson86,Bidelman85(Kuiper,K5) K5.5V(k) : Gray06 *K6V: Adams35,Cowley67,Keenan88(K6Va),Keenan89(K6Va) M0V: Joy74 Keenan88 and Keenan89 considered it a K6V standard, but Gray06 considered it K5.5V(k) rather than K6V. B-V is close to the median of Gray+'s K6Vs. Metal-rich (Fe/H]~+0.24) and ~0.30 mag above the Wright04 MS. Ramirez05 calls it thick disk. V=8.161+-0.025(Mermilliod91), V=8.16(HIP), B-V =1.257+-0.026(HIP), B-V=1.261(Koen10), B-V=1.264+-0.017(Mermilliod91), V-I=1.40+-0.02(HIP), U-B=1.239+-0.097(Mermilliod91). J=5.919+-0.019(2MASS), H=5.323+-0.023(2MASS), Ks=5.160+-0.020(2MASS), V-Ks = 8.16 - 5.160 = 3.00 (HIP,2MASS). PASTEL medians: = 4356K(N=5), =4.5(N=2, Luck05,06), <[Fe/H]>=0.24(N=2, Luck05,06). GaiaDR2: plx=71.1199+-0.0843mas, G=7.6831+-0.0005, Bp-Rp=1.5187, Bp-G=0.7270, G-Rp=0.7917. M_G=6.943+-0.003, Mv=7.42+-0.01, M_Ks=4.42+-0.02. G-V = 7.6831-8.16 = -0.477. # Exemplars GJ 39 = HD 4913 = HIP 3998 = StKM 2-74 K6-V: Gray03 *K6V: Houdebine11,Stephenson86,Bidelman85(K6),Joy48 M0V: Vyssotsky43 12" binary, confirmed to be comoving, codistant in GaiaDR2. Companion is G=15.33 compared to G=8.75 for primary. Stands out has having 5 K6V classifications (if you include Gray03 K6-V). V=9.22(HIP), V=9.224+-0.012(Mermilliod91), B-V=1.194+-0.004(HIP), B-V=1.197+-0.004(Mermilliod91), U-B=1.161+-0.014(Mermilliod91), V-I=1.32+-0.01(HIP). J=6.952+-0.021(2MASS), H= 6.380+-0.016(2MASS), Ks=6.239+-0.021(2MASS), V-Ks = 9.224 - 6.239 = 2.985(Mermilliod91,2MASS). Teffs: 4122+-70K(Houdebine12), 4342K(Mishehina12) => = 4232K. [Fe/H]=0.05(Mishenina12), [FE/H]=0.12(Mishenina08) => <[Fe/H]> ~ +0.08. logg=4.40(Mishenina12). GaiaDR2: G=8.7563+-0.0004, Bp-Rp=1.4925, Bp-G=0.7109, G-Rp=0.7816. GaiaDR2: plx=44.9546+-0.0530, G=8.7563+-0.0004, E(BR/RP)=1.256, Bp-Rp=1.4925, Bp-G=0.7109, G-Rp=0.7816. G-V = 8.7563-9.224 = -0.4677. M_G=7.020+-0.003, Mv=7.488+-0.012, M_Ks=4.503+-0.021. GJ 818 = HD 200779 = Lalande 40844 = G 25-16 = ENG 80A = LHS 3624 M0V: Vysottsky56 K7V: Roman55 *K6V: Adams14,Adams35,Gray03 K5V: Stephenson86 K4: Bidelman85 Adams & Pease (1914) listed the 10 stars of the lowest luminosity known at the time. 1 was a white dwarf, 1 was Lalande 40844 (GJ818), and the rest were Ma, Mb types. V=8.298+-0.016(Mermilliod91), V=8.27(HIP), B-V=1.229+-0.014(Mermilliod91), B-V=1.119+-0.015(HIP), V-I=1.36+-0.02(HIP), U-B=1.177+-0.022(Mermilliod91), J=6.040+-0.023(2MASS), H=5.485+-0.027(2MASS), Ks=5.306+-0.024(2MASS), V-Ks=2.992+-0.029. plx = 66.4656+-0.0394mas(GaiaDR2), Mv=7.41+-0.02(Mermilliod91, GaiaDR2). PASTEL: median Teff = 4444K (N=6), logg=4.3 (N=4), [Fe/H]=0.05 (N=4). GaiaDR2: plx=66.4656+-0.0394mas, G=7.8095+-0.0003, E(BR/RP)=1.259, Bp-Rp=1.5067, Bp-G=0.7184, G-Rp=0.7883. Mv=7.383+-0.010, M_G=6.922+-0.001, M_Ks=4.419+-0.024. G-V=7.8095 - 8.27 = -0.461. HD 72928 = StKM 1-709 = UGP 185 K5V: Houk88 K5.9: Houdebine19(dK5.9 "Subdwarf?") *K6V(k): Gray06,Stephenson86(K6) K6.3: Houdebine16(dK6.3) K7V: Upgren72 Houdebine19 lists two components A and B for HIP42108 but the system is NOT mentioned as binary anywhere else, notably not in WDS or SB9. Absolute magnitude is typical for K6Vs, but Houdebine16 labels it "subdwarf?" and estimates low metallicities of [Fe/H] ~ -0.4. V=10.28(HIP,Mermilliod91), B-V=1.240+-0.015(HIP), V-I=1.20+-0.01(HIP), Ks=7.063+-0.023(2MASS), V-Ks= 10.28 - 7.063 = 3.217. Teffs: 4150K(Houdebine16#1), 4160+-10K(Houdebine16#2), 4230K(Morrell19), 4234K(GaiaDR2), 4280K(Houdebine19/A), 4291K(Houdebine19/B), 4451K(Stevens17), 4643K(Stassun18) => = 4257K. Metallicities: [M/H]=-0.463(Houdebine16#2), [Fe/H]=-0.37(Houdebine16), [Fe/H]=0.0(GaiaDR2) => adopt <[Fe/H]> ~ -0.37. Mv=7.59, M_Ks=4.37. GaiaDR2: plx=28.9916+-0.1167mas(GaiaDR2), G=9.7152+-0.0004, E(BR/RP)=1.269, Bp-Rp=1.5911, Bp-G=0.7690, G-Rp=0.8220. G-V=9.7152-10.28 = -0.5648. M_G=7.027+-0.009, Mv=7.591+-0.013, M_Ks=4.374+-0.025. Rad=0.571Rsun(Houdebine16). GJ 412.3A = GJ 9347 = HIP 54418 = LHS 6197 = LTT 4101 = CD-27 7881 = UGP 252 K5: Bidelman85 dK5.6: Houdebine16 *K6V(k): Gray06 dK2.2: Houdebine19 K7V: Upgren72 Houdebine19 lists Gl 412.3A and B and assigns identical parameters "Binary?". Likely unresolved binary as the Gaia DR2 parallax error seems high (0.3mas), Kervella19 detects perturbation between Gaia and Hipparcos of dV/dt=3757+-100 m/s, and it is seems to be couple tenths mag above MS. V=9.32(HIP), V=9.321+-0.010(Mermilliod91), B-V=1.237+-0.010(HIP), B-V=1.243+-0.016(Mermilliod91), U-B=1.178+-0.006(Mermilliod91), V-Ic=1.47+-0.01(HIP), Ks=6.133+-0.018(2MASS), V-Ks = 9.321 - 6.133 = 3.188. GaiaDR2: plx=36.8377+-0.3025mas, G=8.8013+-0.0003, E(BR/RP)=1.273, Bp-Rp=1.5786, Bp-G=0.7573, G-Rp=0.8213. Mv=7.15, M_G=6.633+-0.018. M_Ks=3.964+-0.025. G-V = 8.8013 - 9.321 = -0.520. Teffs: 4220+-100K(Houdebine16), 4250K(GaiaDR2#1), 4260+-100K(Bai19), 4263+-76K(Houdebine16#2), 4271+-38K(Masana06,Stassun19), 4321K(GaiaDR2#2), 4345+-12K(Stevens17), 4370K(Houdebine16#3), 4375K(Favata97) => =4271K. [Fe/H] = -0.25(Houdebine16), [M/H]=-0.215(Houdebine16#2), [Fe/H]=-0.03+-0.19(Favata97), [Fe/H]=0.0(GaiaDR2) => adopt [Fe/H] ~ -0.2. Rad = 0.634Rsun(Houdebine16). GJ 249 = HD 49601 = HIP 32919 = LHS 1874 = LTT 11932 = 2MASS J06513242+4722050 K5: Bidelman85,Luo18(#1,LAMOST) dK5.2: Houdebine16 *K6V: Joy47,Gray06 K7: Luo18(#2,LAMOST) K8V: Vyssotksy52 M1: Lee47 V=8.95(HIP,Tycho), V=8.99+-0.01(Mermilliod91), B-V=1.232+-0.004(HIP), B-V=1.235+-0.005(Mermilliod91), U-B=1.160(Mermilliod91), V-Ic=1.39+-0.00(HIP), Ks=5.897+-0.017(2MASS), V-Ks = 8.98 - 5.897 = 3.083. GaiaDR2: plx=53.5873 0.0377mas, G= 8.4570 0.0005, E(BR/RP)=1.258, Bp-Rp=1.5306, Bp-G=0.7360, G-Rp=0.7947. Mv=7.635+-0.010, M_Ks=4.542+-0.017, M_G=7.102+-0.002. G-V = 8.4570 - 8.99 = -0.533. Teffs: 4000K(GaiaDR2#1), 4101K(Anders19), 4170+-108K(Luo18#1,Luo19#1), 4197+-21K(Wu11), 4198+-113K(Luo18#2,Luo19#2), 4224+-60K(Luo16,LAMOST). 4265K(GaiaDR2#2), 4282+-121K(Stassun19), 4294+-100K(Houdebine16#1), 4321+-27K(Houdebine16#2), 4462+-13K(Stevens17) => = 4224K. [Fe/H] = -0.178+-0.100(Luo18#1,Luo19#1), -0.17+-0.06(Wu11), -0.112+-0.120(Luo16), +0.012+-0.106(Luo18#2,Luo19#2) => <[Fe/H]> ~ -0.14. Star is only 0.06mag below MS of Wright04. HIP 11739 = BD-20 470 = LP 770-35 = UGP 38 = StKM 2-218 = 2MASS J02313078-2001415 K5V: Stephenson86 *K6V(k): Gray06 K7V: Upgren72 V=10.24(HIP), B-V=1.253+-0.012(HIP), V-I=1.42+-0.02(HIP), Ks=7.165+-0.020(2MASS) => V-Ks = 10.24 - 7.165 = 3.075. plx = 30.2371+-0.0560mas(GaiaDR2), Mv=7.64, M_Ks=4.57. GaiaDR2: plx=30.2371+-0.0560, G=9.7027 0.0006, E(BR/RP)=1.261, Bp-Rp=1.5430, Bp-G=0.7417, G-Rp=0.8013. M_G=7.105+-0.004, Mv=7.643+-0.011, M_Ks=4.568+-0.020, G-V=10.24-9.7027=-0.5373. Teffs: 4000K(GaiaDR2#1), 4210K(GaiaDR2#2), 4263+-128K(Stassun19), 4306+-59K(Bai19), 4312K(Anders19), 4397+-9K(Stevens17) => =4285K. [Fe/H]=0.0(GaiaDR2; but assumes logg=3.0!) # Depricated Standard GJ 380 = HD 88230 = LHS 280 K5V: Cannon(K5),Hawley97 K6Ve Fe-1: Keenan89 *K7V: Popper56,Wilson62,Boeshaar76,Sato90,Kirkpatrick91(pri),Henry02 K8V: Gray03 K9Ve: Jaschek78(Cowley67) M0V: Adams26,JM53(non-stan,"dM0"),Joy74 Keenan89 lists it as K6Ve Fe-1 standard. PASTEL median: = 4030K(N=8), =4.505(N=2), two metallicities: [Fe/H]=-0.03+-0.18(Woolf05), 0.28(Oinas77). # Other Stars HD 35650 = HIP 25283 = RBS 646 = CPD-39 657 = CD-39 1951 = SAO 195825 = K2: Cannon18 *K6Vke: Gray06,Torres06(K6V) AB Dor Moving Group member. V=9.079(Koen10), B-V=1.286(Koen10), U-B=1.175(Koen10), V-Rc=0.786(Koen10), V-Ic=1.458(Koen10). J=6.702+-0.018, H=6.105+-0.026, Ks=5.921+-0.018. GaiaDR2: plx=57.2104+-0.0281mas, G=8.5263+-0.0011, E(BR/RP)=1.260, Bp-Rp=1.5717, Bp-G=0.7632, G-Rp=0.8085. Mv=7.866+-0.01, M_G=7.314+-0.001, M_Ks=4.708+-0.018. G-V = 8.5263-9.079 = -0.553. V-Ks=9.079-5.921 = 3.158. GJ 898 = HD 221503 = HIP 116215 = BD-17 6769 = StKM 2-1742 = UGP 611 = G 273-68 K5V: Stephenson86,Bidelman85(K5),Upgren72,Joy49 *K6Vk: Gray06,Torres06(K6V) K8V: Munch44 M0Vp: Vyssotsky56 V=8.59(HIP), B-V=1.290+-0.010(HIP), V-I=1.47+-0.02(HIP), Ks=5.473+-0.016(2MASS), V-Ks = 8.59 - 5.473 = 3.117. Teffs: 4205K(GaiaDR2), Has WDS designation (J23328-1651A), however I can find no evidence of a B component. Maybe related to GJ 897AB (HIP 116191)? GJ 898 has pm=+341, -219 mas/yr (GaiaDR2), while GJ897 has pm=+352,-216 mas/yr (Tycho-2) or +350,-218 mas/yr (PPMX). So GJ897 does appear to be a CPM system at separation 339". GaiaDR2: 68.6979+-0.0581mas, G=8.0816 0.0008, E(BR/RP)=1.265, Bp-Rp=1.5850, Bp-G=0.7686, G-Rp=0.8164. M_G=7.266+-0.002, Mv=7.775+-0.010, M_Ks=4.658+-0.016. G-V = 8.0816 - 8.59 = GJ 370 = HD 85512 = LHS 2201 = HIP 48331 = 2MASS J09510700-4330097 K5V: Evans57,Upgren72,Bidelman85(K5) *K6V(k): Gray06 M0V: Houk78 PASTEL compendium medians: = 4433K (N=7), logg=4.39(N=3), [Fe/H] = -0.26(N=3). V=7.636+-0.023(Mermilliod91), V=7.67(HIP), B-V=1.150+-0.023(Mermilliod91), B-V=1.156+-0.012(HIP), U-B=1.095+-0.024(Mermilliod91), V-I=1.34+-0.01. J=5.451+-0.018(2MASS), Ks=4.717+-0.021(2MASS). V-K = 7.67 - 4.717 = 2.953. GaiaDR2: plx=88.6158+-0.0406mas, G=7.1873+-0.0003, E(BR/RP)=1.251, Bp-Rp=1.4640, Bp-G=0.6953, G-Rp=0.7687. M_G=6.925+-0.001, Mv=7.374+-0.023, M_Ks=4.455+-0.021. CD-49 3617 = GJ 308.3 K5.2: Houdibine19 K5/7: Stephenson75 K6V(k): Gray06 HIP 1044 = CD-45 35 = Smethells 155 = UGP 2 = 2MASS J00130257-4510362 K5: SpencerJones39 *K6V(k): Gray06 K7V: Upgren72 M0V: Smethells74 V=10.74(HIP),Ks=7.567+-0.026(2MASS), V-Ks=3.173, B-V=1.308+-0.002(HIP). plx=25.7249+-0.0388mas(GaiaDR2). Mv=7.79, M_Ks=4.62. Appears to be significantly redder than other K6V standards and two other classifications since 70s (Upgren, Smethells) place it later than K6V - so I've not included it as an exemplar. HIP 108020 = UGP 539 = Smethells 92 K6V: Upgren72 *K6.5V: Gray06 K7V: Smethells92 One of only two stars classified K6V by Upgren72. GJ 546 = HIP 70218 = BD+30 2512 = StKM 2-1041 K4/5V: Stephenson86 K5V: Wilson62 *K6V: Gray03 K7: Bidelman85 K8V(e): Cowley67 M0V: Adams26,Lee47,Vyssotksy52(M0Vp) M0.5V: Joy74 Remarkable wide array of published types from K4 to M0.5. One of only two stars classified by Cowley67 as K8V. Published metallicity estimates are all over the place: [Fe/H] = 0.21(Luck17), -0.06(Gonzalez-Hernandez09), -0.21(Houdebine16), [M/H]=-0.22(Houdebine19), [M/H]=-0.253(Houdebine16), -1.50(Alonso96). Velocity vector: U,V,W = -23.4, -51.7, -19.0 km/s(Ridel17) seems disk-like. HIP 13886 = CD-55 624 = CPD-55 479 = UGP 48 = 2MASS J02584910-5448152 K5V: Upgren72 K6V: Torres06 *K6+Vk: Gray06 Is a companion TYC source TYC 8492-1451-2. GJ 186 = HUP 23516 = CD-23 2363 = CPD-23 683 = UGP 104 = StKM 2-401 = BEU 7 = MCC 113 K5V: Upgren72,Stephenson86(K5:V) *K6V: Gray06 K7: Bidelman85 M0V: Vyssotsky46 M0.5V: Joy74 HD 34751A = HIP 24783 = MCC 114 = UGP 110 = DON 101A = BD-21 1131 = WDS J05189-2124A K3/5V: Houk88 K5V: Upgren72 *K6Vk: Gray06 K7V: Reid95 M0V: Joy74 M3.5Ve companion at 5". GJ 9714 = HD 199981 = HIP 103768 = CD-33 15343 = LTT 8325 = UGP 511 K5V: Upgren72,Houk82 *K6V(k): Gray06 M0V: Vyssotsky56 HD 17230 *K6V: Gray03 K6/7V: Stephenson86 K8V: Vyssotsky56