Magnitude 5.791 | Constellation Aquarius | |
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74 Aquarii (abbreviated 74 Aqr) is a triple star system in the constellation of Aquarius. 74 Aquarii is its Flamsteed designation and it also bears the variable star designation HI Aquarii. The combined apparent visual magnitude is 5.8 and it is located at a distance of 700 light-years (210 parsecs) from Earth.
The inner pair of stars form a double-lined spectroscopic binary, where the presence of both components is revealed from the Doppler shift of their spectral lines. They have an orbital period of 3.4298 days. A third component is orbiting the inner pair with an 18-year period at a typical angular separation of 0.078 arcseconds. In 2010, this component was at an angular separation of 0.069 arcseconds along a position angle of 285.9°. This is equivalent to a projected separation of 13.9 ± 2.4 AU.