Abstract: | The physical and orbital elements of the binary star ADS 1538 = Σ 168 (α1900 = 01h50m.7, δ1900 = +01°21'; α2000 = 01h55m·8, δ2000 = +01°51') are determined. The absolute visual magnitudes of the two components are 4m.04 resp. 4m.17, the masses 1.34 M⊙ resp. 1.29 M⊙. |