We present new kinematic data for the Ophiuchus stellar stream .
Spectra have been taken of member candidates at the MMT telescope using Hectospec , Hectochelle and Binospec , which provide more than 1800 new velocities .
Combined with proper motion measurements of stars in the field by the Gaia - DR2 catalog , we have derived stream membership probabilities , resulting in the detection of more than 200 likely members .
These data show the stream extends to more than three times the length shown in the discovery data .
A spur to the main stream is also detected .
The high resolution spectra allow us to resolve the stellar velocity dispersion , found to be 1.6 \pm 0.3 km s ^ { -1 } .