Top quark mass and properties at ATLAS

The measurements of the top quark mass and other top quark properties in the lepton+jets and dilepton channels at ATLAS are presented in this paper with emphasis on the current understanding of the systematic uncertainties. All results were obtained using the data taken during 2010 at a proton-proton center-of-mass energy of $sqrt{s}=7$~TeV and correspond to an integrated luminosity of about 35 pb$^{-1}$.