91 Aquarii
Triple star system in the constellation Aquarius / From Wikipedia, the free encyclopedia
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"ψ¹ Aquarii" redirects here. For other stars with this Bayer designation, see ψ Aquarii.
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.
Quick Facts Observation data Epoch J2000.0 Equinox J2000.0, Constellation ...
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] |
Distance | 150 ± 2 ly (45.9 ± 0.6 pc) |
Absolute magnitude (MV) | 0.919[6] |
Details | |
Mass | 1.38±0.29[3] M☉ |
Radius | 10.96±0.21[3] R☉ |
Luminosity | 54.3±3.1[3] L☉ |
Surface gravity (log g) | 2.6[5] cgs |
Temperature | 4730±68[3] K |
Metallicity [Fe/H] | –0.14[5] dex |
Rotational velocity (v sin i) | 2.9[5] km/s |
Age | 2.98±1.63[3] Gyr |
Other designations | |
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 | |
SIMBAD | A |
BC |
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