  We have measured radial velocities and metallicities of 16 RR Lyrae stars,
from the QUEST survey, in the Sagittarius tidal stream at 50 kpc from the
galactic center. The distribution of velocities is quite narrow (std dev=25
km/s) indicating that the structure is coherent also in velocity space. The
mean heliocentric velocity in this part of the stream is 32 km/s. The mean
metallicity of the RR Lyrae stars is [Fe/H]=-1.7. Both results are consistent
with previous studies of red giant stars in this part of the stream. The
velocities also agree with a theoretical model of the disruption of the
Sagittarius galaxy.
