EK Trianguli Australis
... that the stars of the binary system EK Trianguli Australis orbit around a common centre of gravity every 1.5 hours?
... that the stars of the binary system <b id="mwATQ"><a href="./EK_Trianguli_Australis" id="mwATU" rel="mw:WikiLink" title="EK Trianguli Australis">EK Trianguli Australis</a></b> orbit around a common centre of gravity every 1.5 hours?