K8V JM53, Houk75, KeenanMcNeil76, Keenan85, Keenan99, Kirkpatrick91,Houk,Henry02 do not list any K8V standards. Skiff08 does not flag any stars as K8V MK standards. Pecaut13 standard: HIP 111288 - K8V k [following Gray06] Keenan84 does not list K8 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." Gray01/03/06 classify 25 stars as K8V, 23 of which have useful BVI colors in HIP. The nearest (plx=205mas) and brightest (V=6.6) is HIP 49908 (GJ 380), but it has been called K7V by most others, so is unsuitable as a candidate standard. The median colors for the Gray06 K8Vs are: (K8V) = 1.382 (+-0.009 sem, +-0.048 stdev; N=23) (K8V) = 1.608 (+-0.035 sem, +-0.179 stdev; N=23) The two stars bracketing the median B-I colors are HIP 111288 (= StKM 2-1622; only other reference is K7V in Stephenson86) and HIP 82834 (=HD 152606; only other reference is K4/5V q=3 in Houk82) Note that one regularly finds stars classified as K8V by Vyssotsky (1950s) which are significantly bluer (B-V ~ 1.1-1.2) than typical for Gray's K8Vs. (B-V)(K8V) = 1.300 ; exemplar GJ 576 = LHS 3020 (B-V)(K8V) = 1.353 ; exemplar GJ 836.8 = HIP 107346 (B-V)(K8V) = 1.360 ; interp K7V(1.33)-M0V(1.42) (B-V)(K8V) = 1.360 (+-0.039 sem,+-0.061 stdev); med. for 4 ARICNS K8V stars (B-V)(K8V) = 1.363 ; exemplar GJ 1217 = HIP 85026 (B-V)(K8V) = 1.363 ; trend for V-Ks=3.48, V-Ic=1.624 (B-V)(K8V) = 1.372 ; exemplar HD 132683 = GJ 571.1 (B-V)(K8V) = 1.373 ; standard HIP 111288 (K8V) = 1.382 ; 23 Gray03/06 K8V stars (+-0.009 sem, +-0.048 stdev) (B-V)(K8V) = 1.388 ; median Koen10 d<25pc K8V (B-V)(K8V) = 1.41 ; exemplar GJ 757 => adopt (B-V)(K8V) = 1.363 [updated 12/23/2020] => adopt (U-B)(K8V) = 1.219 => adopt (V-I)(K8V) = 1.609 => adopt (V-R)(K8V) = 0.837 => adopt (R-I)(K8V) = 0.772 => adopt (V-J)(K8V) = 2.676 => adopt (V-H)(K8V) = 3.306 => adopt (H-Ks)(K8V) = 0.174 => adopt (J-H)(K8V) = 0.630 (V-Ic)(K8V) = 1.69 ; exemplar GJ 757 (V-Ic)(K8V) = 1.67 ; Koen10 d<25pc sample K8V (N=10) (V-Ic)(K8V) = 1.66 ; exemplar GJ 571.1 (V-Ic)(K8V) = 1.61 ; standard HIP 111288 (V-Ic)(K8V) = 1.609 ; trend for B-V=1.363, V-Ks=3.48 (V-Ic)(K8V) = 1.608 (+-0.035 sem, +-0.179 stdev; N=23) Gray03/06 K8V stars (V-Ic)(K8V) = 1.59 ; exemplar GJ 1217 (V-Ic)(K8V) = 1.57 ; exemplar GJ 576 (V-Ic)(K8V) = 1.55 ; exemplar GJ 836.8 => adopt (V-Ic)(K8V) = 1.609 [updated 12/23/2020] (V-Ks)(K8V) = 3.361 ; exemplar GJ 836.8 = HIP 107346 (V-Ks)(K8V) = 3.362 ; exemplar GJ 576 = LHS 3020 (V-Ks)(K8V) = 3.455 ; exemplar GJ 1217 = HIP 85026 (V-Ks)(K8V) = 3.480 ; trend for K dwarfs+early M standards+exemplars (V-Ks)(K8V) = 3.477 ; exemplar GJ 757 = LHS 5347 (V-Ks)(K8V) = 3.502 ; exemplar GJ 571.1 = HD 132683 (V-Ks)(K8V) = 3.519 ; standard HIP 111288 (V-Ks)(K8V) = 3.549 ; exemplar HIP 112843 = Smethells 118 (V-Ks)(K8V) = 3.630 (+-0.106 sem) ; Kervella19 d<25pc N=10 [probably includes some older K8s] => adopt (V-Ks)(K8V) = 3.48 *** [updated 12/23/2020] => adopt (G-Ks)(K8V) = 2.85 = 3.48 + -0.63 = (V-Ks)+(G-V) [updated 12/23/2020] (G-J)(K8V) = 1.890 ; Bentley18/interp (G-Ks)(K8V) = 2.794 ; Bentley18/interp (Ks-W2)(K8V) = 0.082 ; Bentley18/interp (W1-W2)(K8V) = -0.016 ; Bentley18/interp (Ks-W1)(K8V) = 0.098 ; Bentley18/interp (Ks-W1)(K8V) = 0.115 ; EEM trend for d<30pc for V-Ks=3.44 => adopt (Ks-W1)(K8V) = 0.115 [updated 11/29/2019] (G-V)(K8V) = -0.594 ; exemplar GJ 576 = LHS 3020 (G-V)(K8V) = -0.621 ; from color fit for V-Ks=3.50 (G-V)(K8V) = -0.624 ; trend among standards/exemplars for K/M dwarfs (G-V)(K8V) = -0.625 ; exemplar GJ 1217 = HIP 85026 (G-V)(K8V) = -0.630 ; Kervella19 d<25pc for V-Ks=3.50 (G-V)(K8V) = -0.639 ; exemplar GJ 757 = LHS 5347 (GaiaEDR3) (G-V)(K8V) = -0.646 ; exemplar GJ 571.1 = HD 132683 (G-V)(K8V) = -0.6514 ; standard HIP_111288 => adopt (G-V)(K8V) = -0.625 [updated 3/2/2021] (Bp-Rp)(K7V)= 1.71 ; K7V mean (Bp-Rp)(K8V)= 1.775 ; interp K7V-M0V: V-Ks vs. Bp-Rp (Bp-Rp)(K8V)= 1.7759 ; exemplar GJ 757 = LHS 5347 (GaiaEDR3) (Bp-Rp)(K8V)= 1.7860 ; standard HIP 111288 (Bp-Rp)(M0V)= 1.84 ; M0V mean => adopt (Bp-Rp)(K8V) = 1.78 [updated 12/23/2020] (G-Rp)(K7V)= 0.87 ; K7V mean (G-Rp)(K8V)= 0.8954 ; standard HIP 111288 (G-Rp)(K8V)= 0.9099 ; exemplar GJ 757 = LHS 5347 (GaiaEDR3) (G-Rp)(M0V)= 0.92 ; M0V mean => adopt (G-Rp)(K8V) = 0.89 [updated 12/23/2020] => adopt (Bp-G)(K8V) = 0.89 [updated 12/23/2020; Bp-Rp=1.78, G-Rp=0.89] (g-r)(K8V) = 1.242 ; Jordi06 (V-R)=>(g-r) for R-I=0.843 (g-r)(K8V) = 1.288 ; Bilir05 (B-V)=>(g-r) for B-V=1.37 (g-r)(K8V) = 1.330 ; Covey07 interp K7V 1.34, M0V 1.31 => adopt (g-r)(K8V) = 1.29 [updated 10/10/2020] Mv(K8V) = 8.16 mag ; exemplar GJ 836.8 = HIP 107346 Mv(K8V) = 8.23 mag ; exemplar HD 132683 = GJ 571.1 Mv(K8V) = 8.27 mag ; B-V=1.37 => EEM fit to SIMBAD dwarfs d<25pc Mv(K8V) = 8.37 mag ; standard HIP 111288 Mv(K8V) = 8.39 mag ; SIMBAD d<20pc K dwarf trend for V-Ks=3.50, M_Ks=4.89 Mv(K8V) = 8.40 mag ; Wegner07 Mv(K8V) = 8.40 mag ; smooth trend in K7V-M0V range with xHIP data d<25pc Mv(K8V) = 8.41 mag ; V-K=3.50 => SchlaufmanLaughlin10 calibration Mv(K8V) = 8.42 mag ; V-Ks=3.50, M_Ks=4.92 Mv(K8V) = 8.42 mag ; V-K=3.48 => EEM fit to Reid CNS3 data Mv(K8V) = 8.43 mag ; V-Ks=3.48 MS trend Mv(K8V) = 8.43 mag ; exemplar GJ 576 = LHS 3020 Mv(K8V) = 8.45 mag ; exemplar HIP 112843 = Smethells 118 Mv(K8V) = 8.46 mag ; exemplar GJ 1217 = HIP 85026 Mv(K8V) = 8.47 mag ; V-Ks=3.48 => EEM fit to Jao16 data Mv(K8V) = 8.48 mag ; V-K=3.48 => Mv(JohnsonApps09) Mv(K8V) = 8.48 mag ; median Koen10 d<25pc K8V Mv(K8V) = 8.49 mag ; B-V=1.37 => Wright05 calibration Mv(K8V) = 8.70 mag ; exemplar GJ 757 = LHS 5347 => adopt Mv(K8V) = 8.43 mag [updated 3/2/2021] (M_Ks=4.95, V-Ks=3.48] => adopt M_G(K8V) = 7.80 mag [updated 3/2/2021] (Mv=8.43, G-V=-0.63) => adopt M_Ks(K8V) = 4.95 mag [updated 3/2/2021] (Mv=8.43, V-Ks=3.48) M_G(K8V) = 7.552 ; exemplar GJ 836.8 = HIP 107346 M_G(K8V) = 7.59 ; exemplar GJ 571.1 = HD 132683 M_G(K8V) = 7.691 ; SIMBAD d<20pc trend for V-Ks=3.44 M_G(K8V) = 7.723 ; standard HIP 111288 M_G(K8V) = 7.79 ; exemplar HIP 112843 = Smethells 118 M_G(K8V) = 7.80 ; Mv=8.43, G-V=-0.63 M_G(K8V) = 7.84 ; exemplar GJ 1217 = HIP 85026 M_G(K8V) = 7.84 ; exemplar GJ 576 = LHS 3020 M_G(K8V) = 8.06 ; exemplar GJ 757 = LHS 5347 M_Ks(K8V) = 4.73 mag ; exemplar HD 132683 = GJ 571.1 M_Ks(K8V) = 4.78 mag ; SchlaufmanLaughlin10 calib for V-Ks=3.48 M_Ks(K8V) = 4.80 mag ; exemplar GJ 836.8 = HIP 107346 M_Ks(K8V) = 4.86 mag ; standard HIP 111288 = StKM 2-1622 M_Ks(K8V) = 4.86 mag ; exemplar HIP 112843 = Smethells 118 M_Ks(K8V) = 4.89 mag ; SIMBAD d<20pc K dwarf trend for V-Ks=3.50 M_Ks(K8V) = 4.92 mag ; Mv=8.40, V-Ks=3.48 M_Ks(K8V) = 4.94 mag ; EEM fit to Reid CNS3 data for V-Ks=3.48 M_Ks(K8V) = 4.95 mag ; V-Ks=3.48 MS trend (Mv=8.43) M_Ks(K8V) = 4.99 mag ; V-Ks=3.48 => EEM fit to Jao16 data M_Ks(K8V) = 5.00 mag ; JohnsonApps09 calib for V-Ks=3.48 M_Ks(K8V) = 5.01 mag ; exemplar GJ 1217 = HIP 85026 M_Ks(K8V) = 5.07 mag ; exemplar GJ 576 = LHS 3020 M_Ks(K8V) = 5.13 mag ; Henry04 calib for V-Ks=3.50 M_Ks(K8V) = 5.22 mag ; exemplar GJ 757 = LHS 5347 Teff(K8V) = 3908 K ; Casagrande08 Teff calibration for V-Ks=3.50 Teff(K8V) = 3923 K ; vanBelle09 Teff calibration for V-Ks=3.50 Teff(K8V) = 3929 K ; Mozurkewich03 for V-Ks=3.50 Teff(K8V) = 3966 K ; Boyajian12 calib for V-Ks=3.48 Teff(K8V) = 3979 K ; diBenedetto98 Teff calibration for V-Ks=3.50 Teff(K8V) = 3970 K ; mean photometric Teff Teff(K8V) = 3984 K ; smooth Teff(SpT) trend Teff(K8V) = 3990 K ; interp K7V(V-Ks=3.35,4100K) and M0V(V-Ks=3.65,3900K) Teff(K8V) = 4034 K ; Ramirez05 Teff calibration for B-V=1.363 Teff(K8V) = 4027 K ; Morrell19 Teff for stars w/i +-0.1 mag of M_Ks=4.91 Teff(K8V) = 4039 +- 23 K ; Pecaut13 (GJ 380) Teff(K8V) = 4304 K ; Biazzo07 Teff calibration for B-V=1.363 => adopt Teff(K8V) = 3990 K (logT = 3.601) [updated 12/23/2020] BCv(K8V) = -1.261 mag ; Masana06(Teff=4030K, set so BCv(5772K)=-0.085) BCv(K8V) = -1.139 mag ; Flower96(Teff=3990K, set so BCv(5772K)=-0.085) BCv(K8V) = -1.071 mag ; Casagrande18(Teff=3990K,logg=4.5, set so BCv(5772K)=-0.085) BCv(K8V) = -1.056 +- 0.02 ; non-standard GJ 380 (Pecaut13) BCv(K8V) = -1.040 mag ; Mann15(V-J=2.676) BCv(K8V) = -1.03 mag ; BC_K=2.47, V-Ks=3.48 BCv(K8V) = -1.028 mag ; Bessell98(ATLAS9,logg=4.5,Teff=3990K, set so BCv(5772K)=-0.085) BCv(K8V) = -1.021 mag ; Morrell19(G-Ks=2.85) w/ V-Ks=3.48 BCv(K8V) = -0.996 mag ; EEM fit to Casagrande06/08/10 (Teff=3990K, set so BCv(5772K)=-0.085) BCv(K8V) = -0.976 mag ; Bertone04(ATLAS,Teff=3990K, set so BCv(5772K)=-0.085) => adopt BCv(K8V) = -1.03 mag [updated 12/23/2020, set so BCv(5772K)=-0.085) BC_Ks(K8V) = 2.478 mag ; Mann15(V-J=2.676) BC_Ks(K8V) = 2.47 mag ; BCv=-1.03, V-Ks=3.48 BC_Ks(K8V) = 2.459 mag ; Morrell19(G-Ks=2.85) => adopt BC_Ks(K8V) = 2.47 mag [updated 12/23/2020] logL(K8V) = -1.064 dex ; Mv=8.43, BCv=-1.03 => Mbol = 7.400 => adopt logL(K8V) = -1.064 dex [updated 3/2/2021] => adopt Mbol(K8V) = 7.400 mag [updated 3/2/2021] Mass(K8V) = 0.600 Msun ; Mann18 calib. for M_Ks=4.95 Mass(K8V) = 0.610 Msun ; Eker15 calibration for logL=-1.064 Mass(K8V) = 0.616 Msun ; Eker18 calibration for logL=-1.064 Mass(K8V) = 0.620 Msun ; HenryMcCarthy93 calibration for Mv=8.43 Mass(K8V) = 0.634 Msun ; EEM logL vs. Mass fit for binaries (logL=-1.064) Mass(K8V) = 0.635 Msun ; EEM Mv vs. Mass fit for binaries (Mv=8.43) Mass(K8V) = 0.679 Msun ; Delfosse00 calibration for M_K=4.90 Mass(K8V) = 0.699 Msun ; Benedict16 (Mv=8.43) => adopt Mass(K8V) = 0.62 Msun [updated 3/2/2021] Rad(K8V) = 0.6148 Rsun ; logL=-1.064, Teff=3990K Rad(K8V) = 0.6184 Rsun ; Mann15 calib for M_Ks=4.95 => adopt Rad(K8V) = 0.615 Rsun [updated 3/2/2021] # Standard HIP 111288 = StKM 2-1622 = LP 876-76 = TYC 6391-1169-1 (J2232-2059) K7V: Stephenson86,Gaidos14 *K8Vk: Gray06,Pecaut13(stan) There appear to be no K8V standard stars before 2013. Reid04 lists the star, but does not give a SpT. V=11.01(HIP), B-V=1.373+-0.009(HIP), V-Ic=1.61+-0.02(HIP), Ks=7.491+-0.017 (2MASS), (V-Ks) = 3.519 (I find (K8V) ~ 3.55, so its (V-Ks) is indistinguishable from the K8V mean). In PecautMamajek13, we show that its red optical spectrum is intermediate between a K7V and M0V standards (clearly closer to the K7V standard GJ 673), and adopt HIP 111288 as a K8V standard. GaiaDR2 adopts spectral template of 4000K, logg=3.0, and [Fe/H]=0.0. GaiaDR2: plx=29.7063+-0.0454mas, G=10.3586+-0.0006, E(BR/RP)=1.295, Bp-Rp=1.7860, Bp-G=0.8906, G-Rp=0.8954. Mv=8.37 (Wright04 MS for B-V=1.373 is Mv=8.52, so delta(Mv) = -0.15), M_G=7.723+-0.003, M_Ks=4.855+-0.017. # Exemplars [EEM 12/23/2020: note that as there are few K8Vs in literature, I've pointed out some stars classified as K8V by Gray, that appears to have multiple classification near that type] GJ 836.8 = HIP 107346 = BD+40 4631 = PM J21444+4135 = MCC 71 K5: Lee47,Reid95 K6V: Joy47 K7: Bidelman85 *K8V: Vyssotsky43,Gray03 G/K: Lurie13 V=9.63(Mermilliod91,Hauck90), V=9.65(HIP), V=9.71(Tycho), B-V=1.334+-0.005(HIP), B-V=1.34(Mermilliod91), B-V=1.353(Just08), V-Ic=1.55+-0.01(HIP), V-Rc=0.923(Just08), Rc-Ic=0.755(Just08), U-B=1.20(Mermilliod91). Ks=6.289+-0.021(2MASS), V-Ks = 9.65 - 6.289 = 3.361. GaiaDR2: plx =50.4206+-0.0281mas, G=9.0389+-0.0004, E(BR/RP)=1.280, Bp-Rp=1.6885, Bp-G=0.8307, G-Rp=0.8579. Mv=8.16, M_G=7.552+-0.001, M_Ks=4.802+-0.021. GJ 1217 = HIP 85026 = LTT 6914 = LP 747-25 = BD-14 4622 K5V: Bidelman73 K7V: Stephenson86,Ried95(K7) *K8V(k): Gray06 M0.5V: Joy74 M1:Gaidos14 V=10.89(HIP), B-V=1.363+-0.011(HIP), V-I=1.59+-0.02(HIP). J=8.245+-0.021(2M), H=7.633+-0.016(2M), Ks=7.435+-0.018(2M). V-Ks = 10.89 - 7.435 = 3.455. GaiaDR2: G=10.2647. GaiaEDR3: plx=32.6879+-0.0147mas => Mv = 8.46, M_Ks=5.01, M_G=7.84. G-V = 10.2647 - 10.89 = -0.625. GJ 571.1 = HD 132683 = StKM 2-1103 = UGP 367 K7V: Upgren72,Bidelman85(K7),Stephenson86,Reid95,Gaidos14(K7) *K8Vk: Gray06 M0V: Adams26 M0.5V: Joy74 M2V: Vyssotsky43 Appears as K8V in Gray, but K7V in several other sources. V=9.49(HIP), B-V=1.372+-0.008(HIP), V-Ic=1.66(HIP). Ks=5.988+-0.017. V-Ks= 9.49 - 5.988 = 3.502. GaiaDR2: G=8.8441. GaiaEDR3: plx=56.0678+-0.0258mas => Mv=8.23, M_Ks=4.73, M_G=7.59. G-V = 8.8441 - 9.49 = -0.646. GJ 576 = LHS 3020 = HIP 73786 = StKM 2-1110 = LTT 14482 = BD+06 2986 = G 15-5 = G 66-61 K5V: Bidelman85(K5),Stephenson86,Reid95(K5) *K8V: Gray03 M0V: Vyssotsky46,Joy74 V=9.83(HIP), B-V=1.300+-0.015(HIP), V-I=1.57+-0.01(HIP), Ks=6.468+-0.020(2MASS), V-Ks = 9.83 - 6.468 = 3.362. GaiaDR2: G=9.2357. G-V = 9.2357 - 9.83 = -0.594. GaiaEDR3: plx=52.5048+-0.0235mas => Mv=8.43, M_Ks=5.07, M_G=7.84. GJ 757 = LHS 5347 = HIP 95417 = CD-22 13916 = StKM 2-1407 K4: Bidelman85 K5V: Stephenson86 K7V: Reid95 *K8V(k): Gray06 M1: 1983nssl.conf..365M,Gaidos14 V=10.89(vanAltena95,Mermilliod91,Hauck90), V=10.91(HIP,TYC,SPM4), V=10.929(Rufner88), B-V=1.391+-0.019(HIP), B-V=1.41(vanAltena95,Mermilliod91), U-B=1.15(vanAltena95,Mermilliod91), V-I=1.69+-0.02(HIP), J=8.246+-0.021(2MASS), H=7.613+-0.029(2MASS), Ks=7.433+-0.017(2MASS). V-Ks = 10.91 - 7.433 = 3.477. GaiaEDR3: plx=36.1521+-0.0192mas, G=10.271364+-0.002773, E(BP/RP)=1.300, Bp-Rp=1.775863, Bp-G=0.865976, G-Rp=0.909886. Mv=8.70, M_Ks=5.224+-0.017, M_G=8.06. G-V = 10.271364 - 10.91 = -0.639. HIP 112843 = Smethells 118 = NLTT 55019 = L 358-32 = CD-47 14363 = 2MASS J22510202-4713363 K7: SpencerJones39 *K8Vk: Gray06 M0V: Smethells74 M1: Gaidos14 V=11.61(HIP,TYC,SPM4,Mermilliod91), B-V=1.390+-0.015(HIP), B-V=1.390(Mermilliod91), V-Ic=1.36+-0.02(HHIP), J=8.847+-0.021(2MASS), H=8.199+-0.044(2MASS), Ks=8.016+-0.029(2MASS). V-Ks = 11.61 - 8.061 = 3.549. GaiaEDR3: plx=23.3613+-0.0185mas, G=10.945192+-0.002783, E(Bp/Rp)=1.313, Bp-Rp=1.827334, Bp-G=0.893380, G-Rp=0.933954. G-V = 10.945192 - 11.61 = -0.6648. Mv=8.45, M_Ks=4.86, M_G=7.79. # Other Stars GJ 240 = WDS J06373-5002A K0: SpencerJones39 K7.0: Reid95 *K8V(k): Gray06 M1: Gaidos14 WDS binary 2.3" sep mag1=9.90, mag2=12.43, and component C 27" away (visual component, not sharing motion of A and B). HIP CCDM delta(Hp)=2.664. Hp(A)=9.767. V=9.597+-0.012(Koen02), V=9.61(HIP), V=9.614(Hauck90), V=9.62(Gliese91), B-V=1.445+-0.003(Koen02), B-V=1.46(Gliese91), U-B=1.209+-0.014(Koen02), V-R=0.925+-0.004(Koen02), V-I=1.898+-0.007(Koen02). Assuming del(Hp) ~ del(V), then V(A)=9.69, V(B)=12.35. J=6.610+-0.023(2MASS), H=5.977+-0.027(2MASS), Ks=5.769+-0.020(2MASS). V-Ks(unresolved) = 9.61 - 5.769 = 3.841. HIP 23309 = RBS 608 = CD-57 1054 = TYC 8513-572-1 K7Ve: Upgren72(K7V),Gray01 *K8Vkee: Gray06,Pecaut13(K8Ve) M0Ve: Torres06 M1: Gaidos14 Very active Pre-MS member of Beta Pic Moving Group (~23 Myr-old). Pre-MS and low surface gravity may lend to hotter type in blue (e.g. K7 from Upgren) and redder type in near-IR (e.g. M1 from Gaidos14), and note redder V-Ks below (3.832). So the star's colors and absolute magnitudes are not representative of main sequence stars. VSX reports variable parameters from Kiraga02: period P=8.729day, Vamplitude 0.106 mag. V=9.977+-0.042(Kiraga02,ASAS), V=10.02(HIP), V=10.076(Pickles10,SEDfit), V=10.08(Tycho), V=10.135+-0.054(APASS/DR9),B-V=1.296+-0.092(HIP), V-Ic=1.26+-0.09(HIP), Ks=6.244+-0.024(2MASS), V-Ks = 10.076 - 6.244 = 3.832. GJ 380 = HD 88230 = HIP 49908 = LHS 280 K6Ve Fe-1: Keenan89 *K7V: Popper56,Wilson62,Boeshaar76,Sato90,Kirkpatrick91(pri),Henry02 K8V: Gray03 M0V: Adams26,Joy74 K9Ve: Jaschek78(Cowley67) K5V: Cannon(K5),Hawley97 Too many investigators have classified this as K7V, with only Gray03 calling it K8V. I got with the Boeshaar/Kirkpatrick/Henry classification. HD 16157 = GJ 103 = CC Eri = HIP 11964 = UGP 39 K6V: Joy49,Upgren72(K6Ve) K7Ve: Evans59,Bidelman85(K7) K7V+M4V: Slee04 *K8Vkee: Gray06 M0Ve: Houk78 M1e: Gaidos14 One of only two stars classified K6V by Upgren72. Evans59 wrote entire paper just on this binary (https://ui.adsabs.harvard.edu/?#abs/1959MNRAS.119..526E). Period = 1.56d. Multiple papers on X-ray flares. Probably not a good exemplar given the variability and lack of agreement on classification. Wolf 397 = LHS 305 K5: Bidelman85 sdK5.3: Houdebine19 K8V: Luyten23(K8),Vyssotksy46 M0V: Joy74,Luyten79(M0) Note that a lot of Vyssotsky46's K8V stars end up being ~K5 or even hotter. CD-31 16041 = 2MASS J18504448-3147472 K8Ve: Torres06(Li rich) *K8IVe: Pecaut13 M0: Gaidos13 Pre-MS star, might be TW Hya Association (TWA) member, but unnumbered as such.