  We present a revised and expanded catalog of satellite galaxies of a set of
isolated spiral galaxies similar in luminosity to the Milky Way. This sample of
115 satellites, 69 of which were discovered in our multifiber redshift survey,
is used to further probe the results obtained from the original sample
(Zaritsky et al. 1993). The satellites are, by definition, at projected
separations <~ 500 kpc, have absolute recessional velocity differences with
respect to the parent spiral of less than 500 km/s and are at least 2.2 mag
fainter than their associated primary galaxy. A key characteristic of this
survey is the strict isolation of these systems, which simplifies any dynamical
analysis.
  We find no evidence for a decrease in the velocity dispersion of the
satellite system as a function of radius out to galactocentric radii of 400
kpc, suggesting that the halo extends well beyond 200 kpc. Furthermore, the new
sample affirms our previous conclusions (Zaritsky et al. 1993) that (1) the
velocity difference between a satellite and its primary is not strongly
correlated with the rotation speed of the primary, (2) the system of satellites
has a slight net rotation (34 \pm 14 km\s) in the same sense as the primary's
disk, and (3) that the halo mass of an ~ L* spiral galaxy is in excess of 2 x
10^{12} solar masses.
