Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquarius |
Right ascension | 22h 06m 26.22742s [1] |
Declination | –13° 52′ 10.8615″ [1] |
Apparent magnitude (V) | 4.279 [2] |
Characteristics | |
Spectral type | B8 V [3] |
U−B color index | –0.288 [2] |
B−V color index | –0.062 [2] |
Variable type | constant [4] |
Astrometry | |
Radial velocity (Rv) | –10.0 [5] km/s |
Proper motion (μ) |
RA: +36.89
[1]
mas/
yr Dec.: –58.99 [1] mas/ yr |
Parallax (π) | 18.62 ± 0.22 mas [1] |
Distance | 175 ± 2
ly (53.7 ± 0.6 pc) |
Absolute magnitude (MV) | +0.64 [6] |
Details [7] | |
A | |
Mass | 3.20+0.20 −0.16 M☉ |
Radius | 2.7 [8] R☉ |
Luminosity | 74 [6] L☉ |
Surface gravity (log g) | 4.09±0.08 [9] cgs |
Temperature | 11,284±284 [8] K |
Metallicity [Fe/H] | −0.08±0.12 [9] dex |
Rotational velocity (v sin i) | 135 [10] km/s |
Age | 124+37 −62 Myr |
B | |
Mass | 1.00±0.03 M☉ |
Temperature | 5,710±112 K |
Metallicity [Fe/H] | −0.5 dex |
Rotational velocity (v sin i) | 20 km/s |
Other designations | |
Database references | |
SIMBAD | data |
Iota Aquarii, Latinised from ι Aquarii, is the Bayer designation for a binary star [7] system in the equatorial constellation of Aquarius. It is visible to the naked eye with an apparent magnitude of +4.279. [2] Based upon parallax measurements made during the Hipparcos mission, the distance to this star is around 175 light-years (54 parsecs). [2] The system is drifting closer to the Sun with a radial velocity of −10 km/s. [5]
The binary nature of this system was reported in 2009 following a radial velocity survey using the HARPS instrument. [4] A 2010 infrared search for companions around this star was unsuccessful. [12] 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. [7]
The spectrum of the primary, component A, fits a stellar classification of B8 V, [3] showing that this is a B-type main-sequence star. It is roughly 124 [7] million years old and is spinning rapidly with a projected rotational velocity of 135 km/s. [10] The star has 3.2 [7] times the mass of the Sun and 2.7 [8] times the Sun's radius. It is radiating 74 [6] times the luminosity of the Sun from its photosphere at an effective temperature of ~11,284 km/s. [8] The secondary, component B, has a spectrum of a solar-mass star. [7] The system is a source for X-ray emission. [13]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquarius |
Right ascension | 22h 06m 26.22742s [1] |
Declination | –13° 52′ 10.8615″ [1] |
Apparent magnitude (V) | 4.279 [2] |
Characteristics | |
Spectral type | B8 V [3] |
U−B color index | –0.288 [2] |
B−V color index | –0.062 [2] |
Variable type | constant [4] |
Astrometry | |
Radial velocity (Rv) | –10.0 [5] km/s |
Proper motion (μ) |
RA: +36.89
[1]
mas/
yr Dec.: –58.99 [1] mas/ yr |
Parallax (π) | 18.62 ± 0.22 mas [1] |
Distance | 175 ± 2
ly (53.7 ± 0.6 pc) |
Absolute magnitude (MV) | +0.64 [6] |
Details [7] | |
A | |
Mass | 3.20+0.20 −0.16 M☉ |
Radius | 2.7 [8] R☉ |
Luminosity | 74 [6] L☉ |
Surface gravity (log g) | 4.09±0.08 [9] cgs |
Temperature | 11,284±284 [8] K |
Metallicity [Fe/H] | −0.08±0.12 [9] dex |
Rotational velocity (v sin i) | 135 [10] km/s |
Age | 124+37 −62 Myr |
B | |
Mass | 1.00±0.03 M☉ |
Temperature | 5,710±112 K |
Metallicity [Fe/H] | −0.5 dex |
Rotational velocity (v sin i) | 20 km/s |
Other designations | |
Database references | |
SIMBAD | data |
Iota Aquarii, Latinised from ι Aquarii, is the Bayer designation for a binary star [7] system in the equatorial constellation of Aquarius. It is visible to the naked eye with an apparent magnitude of +4.279. [2] Based upon parallax measurements made during the Hipparcos mission, the distance to this star is around 175 light-years (54 parsecs). [2] The system is drifting closer to the Sun with a radial velocity of −10 km/s. [5]
The binary nature of this system was reported in 2009 following a radial velocity survey using the HARPS instrument. [4] A 2010 infrared search for companions around this star was unsuccessful. [12] 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. [7]
The spectrum of the primary, component A, fits a stellar classification of B8 V, [3] showing that this is a B-type main-sequence star. It is roughly 124 [7] million years old and is spinning rapidly with a projected rotational velocity of 135 km/s. [10] The star has 3.2 [7] times the mass of the Sun and 2.7 [8] times the Sun's radius. It is radiating 74 [6] times the luminosity of the Sun from its photosphere at an effective temperature of ~11,284 km/s. [8] The secondary, component B, has a spectrum of a solar-mass star. [7] The system is a source for X-ray emission. [13]