The Hubble diagram in V for supernovae of Type IA and the value of H(0) therefrom

The Hubble diagram for supernovae of Type Ia is derived in V and is summarized from the literature in mₚg_ and in B. The ridge line equation of the diagram in V is log v₂20_ = 0. 2 mᵥ_ + (0. 653 +/- 0. 012) from 34 SNe Ia. The dispersion of a single point about the ridge line is 0. 36 mag. We argue from external evidence that the intrinsic dispersion is likely to be as small or smaller than σ) v_ (max) = 0. 2 mag. The intrinsic (B - V) color at B maximum light is 0. 09 +/- 0. 04 mag. The calibration of the absolute magnitudes at maximum from four concordant methods, including the determination for SN 1937C via Cepheids in IC 4182, is = - 19. 55 +/- 0. 14 and M_V_ (max) = - 19. 71 +/- 0. 13. These values lead to the long distance scale with between 45 and 52 km s^-1^ Mpc^-1^. This range depends on whether we use (1) the SN Hubble diagrams in the mₚg_, B, and V bands themselves from Figure 1, or (2) the derived virgo Cluster distance of 23. 9 +/- 2. 4 Mpc found from the SN 1937C calibration alone at MV_ (max) = - 19. 76, applied to the six SNe Ia with adequate V photometry that have appeared in the cluster with = 12. 13 +/- 0. 14. By the precepts previously developed for the Virgo velocity relative to the cosmic frame (Sandage Jerjen & Tammann 1992), this Virgo distance gives the cosmic value of the Hubble constant to be H₀_ = 47 +/- 5 km s^-1^ Mpc^-1^.