  We calculate the limits of the quasi-local angular momentum and
center-of-mass defined by Chen-Wang-Yau \cite{CWY} for a family of spacelike
two-spheres approaching future null infinity in an asymptotically flat
spacetime admitting a Bondi-Sachs expansion. Our result complements earlier
work of Chen-Wang-Yau \cite{CWY2}, where the authors calculate the limits of
the quasi-local energy and linear momentum at null infinity. Finiteness of the
center-of-mass limit requires that the spacetime be in the so-called
center-of-mass frame, a mild assumption on the mass aspect function amounting
to vanishing of linear momentum at null infinity. With this condition and the
assumption that the Bondi mass is non-trivial, we obtain explicit expressions
for the angular momentum and center-of-mass at future null infinity in terms of
the observables appearing in the Bondi-Sachs expansion of the spacetime metric.
