  The exact metric of a moving Kerr black hole with an arbitrary constant
velocity is derived in Kerr-Schild coordinates. We then calculate the null
equatorial gravitational deflection caused by a radially moving Kerr source up
to the second post-Minkowskian order, acting as an application of the weak
field limit of the metric. The bending angle of light is found to be consistent
with the result given in the previous works.
