The Hubble Constant from Infrared Surface Brightness Fluctuation Distances*

We present a measurement of the Hubble constant $H_0$ from surface brightness fluctuation (SBF) distances for 63 bright, mainly early-type galaxies out to 100 Mpc observed with Wide Field Camera 3 Infrared Channel (WFC3/IR) on Space Telescope (HST). The sample is drawn several independent HST imaging programs using F110W bandpass WFC3/IR. majority are in 50 80 range and come MASSIVE galaxy survey. median statistical uncertainty individual distance measurements 4%. construct diagram these IR SBF constrain {four} different treatments velocities. For zero point calibration, we use both existing tie Cepheid variables, updated consistency latest determination Large Magellanic Cloud detached eclipsing binaries, new tip red giant branch (TRGB) calibrated maser NGC4258. These two calibrations consistent each other theoretical predictions stellar population models. From weighted average TRGB calibrations, derive $H_0=73.3{\,\pm\,}0.7{\,\pm\,}2.4$ km/s/Mpc, where error bars reflect systematic uncertainties. This result accords well recent Type~Ia supernovae, time delays multiply lensed quasars, water masers. could be reduced below 2% by calibrating method precision massive Virgo cluster measured James Webb Telescope.