91 Aquarii

"ψ¹ Aquarii" redirects here. For other stars with this Bayer designation, see ψ Aquarii.
91 Aquarii
Location of ψ1 Aquarii (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Aquarius
Right ascension 23h 15m 53.49482s[1]
Declination –9° 05′ 15.8546″[1]
Apparent magnitude (V) +4.248[2]
Characteristics
Spectral type K1 III[3]
U−B color index +1.035[2]
B−V color index +1.104[2]
R−I color index 0.56[4]
Astrometry
Radial velocity (Rv)−25.49±0.74[5] km/s
Proper motion (μ) RA: +368.78[1] mas/yr
Dec.: –17.16[1] mas/yr
Parallax (π)21.77 ± 0.29 mas[1]
Distance150 ± 2 ly
(45.9 ± 0.6 pc)
Absolute magnitude (MV)0.919[6]
Details
Mass1.38±0.29[3] M☉
Radius10.96±0.21[3] R☉
Luminosity54.3±3.1[3] L☉
Surface gravity (log g)2.6[5] cgs
Temperature4730±68[3] K
Metallicity [Fe/H]–0.14[5] dex
Rotational velocity (v sin i)2.9[5] km/s
Age2.98±1.63[3] Gyr
Other designations
Psi1 Aquarii, ADS 16633, Gl 893.2, WDS J23159-0905
A: BD–09 6156, FK5 1608, HD 219449, HIP 114855, HR 8841, LTT 9437, SAO 146598
BC: BD–09 6155, HD 219430, LTT 9434, SAO 146596
Database references
SIMBADA
BC

91 Aquarii is the Flamsteed designation for a triple star[7] system in the equatorial constellation of Aquarius. It also bears the Bayer designation Psi1 Aquarii (ψ1 Aqr, ψ1 Aquarii). It is visible to the naked eye with an apparent visual magnitude of +4.248.[2] Parallax measurements yield an estimated distance of around 150 light-years (46 parsecs) from Earth.[1] An extrasolar planet is known to orbit the main star.

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