Iota Aquarii is a binary star[ system in the equatorial constellation of Aquarius. Its identifier is a Bayer designation that is Latinised from ι Aquarii, and abbreviated Iota Aqr or ι Aqr, respectively. This star is visible to the naked eye with an apparent magnitude of +4.279.][ Based upon stellar parallax measurements, the distance to this star is around .][ The system is drifting closer to the Sun with a radial velocity of −10 km/s.][
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The binary nature of this system was reported in 2009 following a radial velocity survey using the HARPS instrument.[ A 2010 infrared search for companions around this star was unsuccessful.][ The presence of a stellar companion was confirmed through direct spectral detection in 2016. The companion shows a significant velocity variation over a 77-day interval, suggesting a short orbital period.][
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The stellar spectrum of the primary, component A, fits a stellar classification of B8 V,[ showing that this is a B-type main-sequence star. It is roughly 124][ million years old and is spinning rapidly with a projected rotational velocity of 135 km/s.][ The star has 3.2][ times the mass of the Sun and 2.7][ times the Sun's radius. It is radiating 74][ times the luminosity of the Sun from its photosphere at an effective temperature of ~11,284 K.][ The secondary, component B, has a spectrum of a solar-mass star.][ The system is a source for X-ray emission.][
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