flags40width=560,height=300,toolbar=no,scrollbars=yes,resizable=yes 1 Earth-crossing asteroid (ECA) 2 Perihelium q<=1.0167AU, but is not ECA 4 Amors (1.0167 < q < 1.3 AU) 8 Mars crossers (1.3 < q < 1.6660 AU) 16 Outer-planet crossers (excluding Jupiter Trojans)