  The binary eta Carinae is the closest example of a very massive star, which
may have formed through a merger during its Great Eruption in the
mid-nineteenth century. We aimed to confirm and improve the kinematics using a
spectroscopic data set taken with the CTIO 1.5 m telescope over the time period
of 2008-2020, covering three periastron passages of the highly eccentric orbit.
We measure line variability of H-alpha and H-beta, where the radial velocity
and orbital kinematics of the primary star were measured from the H-beta
emission line using a bisector method. At phases away from periastron, we
observed the He II 4686 emission moving opposite the primary star, consistent
with a possible Wolf-Rayet companion, although with a seemingly narrow emission
line. This could represent the first detection of emission from the companion.
