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W. L. Freedman (Carnegie Obs.)
One of the "Key Projects" designated for the Hubble Space Telescope was to measure the value of the Hubble constant to an accuracy of 10%. Our group proposed to carry out this measurement by providing Cepheid distances to a sample of nearby galaxies useful for calibrating numerous secondary distance indicators. Our database of galaxies with new Cepheid distances will shortly be complete (http://www.ipac.caltech.edu/H0kp/H0KeyProj.html) and available to the entire astronomical community. In this review talk, I will focus on combining the results obtained from the Key Project, yielding a value of H0 based on our Cepheid calibration for type Ia supernovae, the Tully Fisher relation, the fundamental plane, and surface brightness fluctuations. The largest remaining uncertainties will be discussed.
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