Clark and Stephenson argue that to be considered as a possible supernova, the new light should last at least forty days. The 5 BC appearance lasted more than seventy days. And unlike comets, supernovas do not move against the background of the fixed stars. The annals do not record any movement of the new light of 5 BC. Thus, according to the research of Clark and Stephenson published in 1977, the new light of 5 BC might be considered as a possible supernova.