We present an updated version of the Multicolor Light Curve Shape method to measure distances to type Ia supernovae ( SN Ia ) , incorporating new procedures for K -correction and extinction corrections .
We also develop a simple model to disentangle intrinsic color variations and reddening by dust , and expand the method to incorporate U -band light curves and to more easily accommodate prior constraints on any of the model parameters .
We apply this method to 133 nearby SN Ia , including 95 objects in the Hubble flow ( cz \geq 2500 { km s ^ { -1 } } ) , which give an intrinsic dispersion of less than 7 % in distance .
The Hubble flow sample , which is of critical importance to all cosmological uses of SN Ia , is the largest ever presented with homogeneous distances .
We find the Hubble flow supernovae with H _ { 0 } d _ { SN } \geq 7400 { km s ^ { -1 } } yield an expansion rate that is 6.5 \pm 1.8 % lower than the rate determined from supernovae within that distance , and this can have a large effect on measurements of the dark energy equation of state with SN Ia .
Peculiar velocities of SN Ia host galaxies in the rest frame of the Local Group are consistent with the dipole measured in the Cosmic Microwave Background .
Direct fits of SN Ia that are significantly reddened by dust in their host galaxies suggest their mean extinction law may be described by R _ { V } \simeq 2.7 , but optical colors alone provide weak constraints on R _ { V } .