T2V

Standards:
Burgasser06 stans: SDSS J125453.90-012247.4 T2 (primary standard)

SIMBAD lists only one T2 within 10pc: SIMP J013656.5+093347.3 

Teff(T2V) = 1184 K ; Filipazzo15 M6V-T9V field calibration 
Teff(T2V) = 1189 K ; Dupuy17(SaumonMarley08 model scale)
Teff(T2V) = 1218 K ; Kirkpatrick20 (Table 13 polynomial)
Teff(T2V) = 1232 K ; Dupuy17(Lyon model scale)
=> adopt Teff(T2V) = 1200 K (logT = 3.079) [updated 12/30/2020]

SIMP_0136+0933 appears to be near middle of group for the J & K colors
M_J(T2V) =  14.36  ; SDSS_1254-0122 calc using Kirkpatrick20 (plx=78.34mas)
M_J(T2V) =  14.39  ; 2MASS_1122-3512 calc using Kirkpatrick20 (plx=74.8605mas)
M_J(T2V) = 14.400  ; EEM fit to L/T dwarfs d<25pc
M_J(T2V) =  14.47  ; WISE_0457-0207 calc using Kirkpatrick20 (plx=82.0mas)
M_J(T2V) = 14.51   ; exemplar SIMP_0136+0933 calc using Kirkpatrick20 (plx=162.13mas)
M_J(T2V) = 14.52   ; M_J(MKO)=14.30, J(MKO)-J=-0.22
M_J(T2V) =  14.67  ; WISE_1755+1803 calc using Kirkpatrick20 (plx=53.6mas)
M_J(T2V) =  14.80  ; WISE_2121-6239 calc using Kirkpatrick20 (plx=74.9mas)
M_J(T2V) =  14.84  ; PSO_1629+0335 calc using Kirkpatrick20 (plx=81.2mas)
M_J(T2V) =   15.59 ; 2MASS_1324+6358 calc using Kirkpatrick20 (plx=99.7mas)
=> adopt M_J(T2V) = 14.52 [update 12/5/2020] (M_J(MKO)=14.30, J(MKO)-J=-0.22)

M_J(MKO)(T2V) =  14.14 ; SDSS_1254-0122 calc using Kirkpatrick20 (plx=78.34mas)
M_J(MKO)(T2V) =  14.20 ; 2MASS_1122-3512 calc using Kirkpatrick20 (plx=74.8605mas)
M_J(MKO)(T2V) =  14.24 ; WISE_0457-0207 calc using Kirkpatrick20 (plx=82.0mas)
M_J(MKO)(T2V) = 14.30  ; exemplar SIMP_0136+0933 calc using Kirkpatrick20 (plx=162.13mas)
M_J(MKO)(T2V) =  14.43 ; WISE_1755+1803 calc using Kirkpatrick20 (plx=53.6mas)
M_J(MKO)(T2V) =  14.53 ; WISE_2121-6239 calc using Kirkpatrick20 (plx=74.9mas)
M_J(MKO)(T2V) =  14.61 ; PSO_1629+0335 calc using Kirkpatrick20 (plx=81.2mas)
=> adopt M_J(MKO)(T2V) = 14.30 [updated 12/5/2020] (M_J=14.52, J(MKO)-J=-0.22)

(J(MKO)-J)(T2V) =  -0.27 +- 0.05 ; WISE_2121-6239 
(J(MKO)-J)(T2V) =  -0.24 +- 0.09 ; WISE_1755+1803 
(J(MKO)-J)(T2V) =  -0.23 +- 0.04 ; WISE_0457-0207 
(J(MKO)-J)(T2V) = -0.22 +- 0.04  ; PSO_1629+0335 
(J(MKO)-J)(T2V) =  -0.22 +- 0.04 ; SDSS_1254-0122 
(J(MKO)-J)(T2V) = -0.21 +- 0.03 ; exemplar SIMP_0136+0933 
(J(MKO)-J)(T2V) =  -0.19 +- 0.04 ; 2MASS_1122-3512
=> adopt (J(MKO)-J)(T2V) = -0.22 [updated 12/5/2020]

M_K(MKO)(T2V) =  13.36 ; SDSS_1254-0122 calc using Kirkpatrick20 (plx=78.34mas)
M_K(MKO)(T2V) = 13.54  ; M_Ks=13.5, K(MKO)-Ks=0.04 
M_K(MKO)(T2V) = 13.64  ; exemplar SIMP_J0136+0933 calc using Kirkpatrick20 (plx=162.13mas)
=> adopt M_K(MKO)(T2V) = 13.49 [updated 12/5/2020] (M_Ks=13.60, K(MKO)-Ks=0.04)

M_Ks(T2V) =  13.31 ; SDSS_1254-0122 calc using Kirkpatrick20 (plx=78.34mas)
M_Ks(T2V) =  13.33 ; WISE_1755+1803 calc using Kirkpatrick20 (plx=53.6mas)
M_Ks(T2V) = 13.45 ; fit to Kirkpatrick20 L7-T3 dwarfs
M_Ks(T2V) = 13.48 ; trend to L/T dwarfs in notes (1/2021)
M_Ks(T2V) =  13.51 ; WISE_0457-0207 calc using Kirkpatrick20 (plx=82.0mas)
M_Ks(T2V) =  13.59 ; PSO_1629+0335 calc using Kirkpatrick20 (plx=81.2mas)
M_Ks(T2V) = 13.61 ; SIMP_J0136+0933 calc using Kirkpatrick20 (plx=162.13mas)
M_Ks(T2V) =  13.71 ; WISE_2121-6239 calc using Kirkpatrick20 (plx=74.9mas)
M_Ks(T2V) =  13.72 ; 2MASS_1122-3512 calc using Kirkpatrick20 (plx=74.8605mas)
M_Ks(T2V) =  14.05 ; 2MASS_1324+6358 calc using Kirkpatrick20 (plx=99.7mas)
=> adopt M_Ks(T2V) = 13.5 [updated 12/30/2020] (M_K(MKO)=13.54, K(MKO)-Ks=0.04)

(K(MKO)-Ks)(T2V) = 0.03 +- 0.02 ; SIMP_0136+0933
(K(MKO)-Ks)(T2V) = 0.05 +- 0.05 ; SDSS_1254-0122
=> adopt (K(MKO)-Ks)(T2V) = 0.04 [updated 12/5/2020]

M_G(T2V) = 20.55 ; exemplar SIMP_J0136+0933
=> adopt M_G(T2V) = 20.55 [updated 1/15/2021]

BC_Ks(T2V) = 2.991 ; Filipazzo15 (field) [denser trend through L/T]
BC_Ks(T2V) = 2.770 ; Looper08
=> adopt BC_Ks(T2V) = 2.99 [updated 11/1/2019]

(Ks-W1)(T2V) = 0.532 ; Dupuy12 #1
=> adopt (Ks-W1)(T2V) = 0.53 [updated 12/28/2019]

logL(T2V) = 

# Exemplar

SIMP J013656.5+093347.3 = 2MASS J01365662+0933473 = WISEP J013657.45+093347.0
 *T2.0: Burgasser10(SpeX,near-IR),Best18(T2,opt),Kirkpatrick20(both opt. & near-IR)
  T2.5: Looper07(near-IR),Burgasser10(near-IR),Kirkpatrick11,Kirkpatrick12

  Very nearby T dwarf (6pc).  J=13.455+-0.030(2M, H=12.771+-0.032(2M),
  Ks=12.562+-0.024(2M).  GaiaEDR3: plx=163.4478+-0.4629mas,
  G=19.486692+-0.007034, E(BP/RP)=2.467, Bp-Rp=3.466303,
  Bp-G=1.620592, G-Rp=1.845711.  G-Ks = 19.487 - 12.562 = 6.925.
  M_J= 14.522+-0.031, M_Ks=13.629+-0.025, M_G=20.55.
  Teffs: 1051+-198K(Kirkpatrick20,"yng")