| Abstract | The distance modulus of the Hercules supercluster of galaxies is determined anew by two independent methods: (1) the maximum apparent luminosities of presumed Type I supernovae, >mpg< = 17.0, give a mean corrected modulus μ0 = 35.22±0.28; and (2) the mean apparent magnitudes and diameters of seven Sbc spirals of luminosity classes I to II, corrected for extinction, give a mean corrected modulus μ0 = 35.27±0.15. This leads to a value of the Hubble ratio, >H*< = 99±7 km s-1Mpc-1, which should be free of both Malmquist bias and the effect of local perturbations. The corresponding value of the Hubble constant, H0, depends slightly on cosmological model and corrections. |
