AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 39. Results from the HST Key Project on the Extragalactic Distance Scale
Topical, Oral, Tuesday, June 1, 1999, 8:30-10:00am, 10:45am-12:30pm, 2:30-4:00pm, International Ballroom South

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[39.09] Summary of Results: The HST H0 Key Project

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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