T1.5V SIMBAD lists only one T1.5V within 10pc: WISE J203042.79+074934.7 Teff(T1.5V) = 1200 K ; Filippazzo15 calibration (M6V-T9V) Teff(T1.5V) = 1227 K ; Kirkpatrick20 (Table 13 polynomial) M_J(T1.5V) = 14.11 ; PSO_1505-2853 calc using Kirkpatrick20 (plx=42.5mas) M_J(T1.5V) = 14.28 ; 2MASS_0949-1545 calc using Kirkpatrick20 (plx=42.22mas) M_J(T1.5V) = 14.31 ; exemplar WISE_2030+0749 calc using Kirkpatrick20 (plx=103.9664mas) M_J(T1.5V) = 14.517 ; EEM fit to L/T dwarfs d<25pc M_J(T1.5V) = 14.94 ; WISE_0111-5053 calc using Kirkpatrick20 (plx=57.3mas) M_J(T1.5V) = 15.06 ; SDSS_0909+6525 calc using Kirkpatrick20 (plx=63.9mas) M_J(T1.5V) = 15.29 ; 2MASS_2139+0220 calc using Kirkpatrick20 (plx=101.5mas) => adopt M_J(T1.5V) = 14.52 [updated 12/30/2020] M_J(MKO)(T1.5V) = 14.13 ; WISE_2030+0749 calc using Kirkpatrick20 (plx=103.9664mas) M_J(MKO)(T1.5V) = 14.56 ; WISE_0111-5053 calc using Kirkpatrick20 (plx=57.3mas) M_J(MKO)(T1.5V) = 14.68 ; 2MASS_2139+0220 calc using Kirkpatrick20 (plx=101.5mas) (J(MKO)-J)(T1.5V) = -0.61 +- 0.05 ; 2MASS_2139+0220 (J(MKO)-J)(T1.5V) = -0.38 +- 0.12 ; WISE__0111-5053 (J(MKO)-J)(T1.5V) = -0.36 +- 0.12 ; 2MASS_0949-1545 (J(MKO)-J)(T1.5V) = -0.27 +- 0.08 ; PSO___1505-2853 (J(MKO)-J)(T1.5V) = -0.18 +- 0.03 ; WISE__2030+0749 M_K(MKO)(T1.5V) = 13.20 ; PSO_1505-2853 calc using Kirkpatrick20 (plx=42.5mas) M_K(MKO)(T1.5V) = 13.33 ; 2MASS_0949-1545 calc using Kirkpatrick20 (plx=42.22mas) M_Ks(T1.5V) = 12.93 ; PSO_1505-2853 calc using Kirkpatrick20 (plx=42.5mas) M_Ks(T1.5V) = 13.22 ; 2MASS_0949-1545 calc using Kirkpatrick20 (plx=42.22mas) M_Ks(T1.5V) = 13.33 ; WISE_0111-5053 calc using Kirkpatrick20 (plx=57.3mas) M_Ks(T1.5V) = 13.37 ; fit to Kirkpatrick20 L7-T3 dwarfs M_Ks(T1.5V) = 13.38 ; trend to L/T dwarfs in notes (1/2021) M_Ks(T1.5V) = 13.40 ; exemplar WISE_2030+0749 calc using Kirkpatrick20 (plx=103.9664mas) M_Ks(T1.5V) = 13.61 ; 2MASS_2139+0220 calc using Kirkpatrick20 (plx=101.5mas) M_Ks(T1.5V) = 14.20 ; SDSS_0909+6525 calc using Kirkpatrick20 (plx=63.9mas) => adopt M_Ks(T1.5V) = 13.37 [updated 12/30/2020] (K(MKO)-Ks)(T1.5V) = 0.11 +- 0.17 ; 2MASS_0949-1545 11.5 (K(MKO)-Ks)(T1.5V) = 0.27 +- 0.13 ; PSO___1505-2853 11.5 => adopt (K(MKO)-Ks)(T1.5V) ~ 0.2 [updated 11/26/2020] M_G(T1.5V) = 20.22 ; exemplar WISE J203042.79+074934.7 (G-Ks)(T1.5V) = 6.842 ; exemplar WISE J203042.79+074934.7 BC_K(T1.5V) = 3.027 ; Filipazzo15 field M6V-T8V calibration # Exemplar WISE J203042.79+074934.7 = 2MASS J20304235+0749358 = PSO J307.6784+07.8263 *T1.5: Mace14(near-IR,Best18) Very nearby T dwarf (9.7pc) and only one with T1.5 as default type in SIMBAD within 10pc. J=14.227+-0.029(2M), H=13.435+-0.033(2M), Ks=13.319+-0.039(2M). GaiaEDR3: plx=102.7966+-0.8009mas, G=20.160710+-0.012496, E(BP/RP)=2.418, Bp-Rp=3.221901, Bp-G=1.416195, G-Rp=1.805706. => M_G=20.22+-0.02, M_J=14.287+-0.034, M_Ks=13.379+-0.043, G-Ks = 20.161 - 13.319 = 6.842.