  We consider the top quark charge asymmetry in the process $pp \to
t\bar{t}+\gamma$ at the 13 TeV LHC. The genuine tree level asymmetry in the
$q\bar{q}$ channel is large with about -12%. However, the symmetric $gg$
channel, photon radiation off top quark decay products, and higher order
corrections wash out the asymmetry and obscure its observability. In this work,
we investigate these effects at next-to-leading order QCD and check the
robustness of theoretical predictions. We find a sizable perturbative
correction and discuss its origins and implications. We also study dedicated
cuts for enhancing the asymmetry and show that a measurement is possible with
an integrated luminosity of 150 fb$^{-1}$.
