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Beta Aquarii
Double star in the constellation Aquarius / From Wikipedia, the free encyclopedia
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Beta Aquarii is a single[14] star in the constellation of Aquarius. It has the official name Sadalsuud (/ˌsædəlˈsuːəd/)[15] and the Bayer designation β Aquarii, abbreviated Beta Aqr or β Aqr. Based upon parallax measurements obtained during the Hipparcos mission, this component is located at a distance of approximately 540 light years (165 parsecs) from the Sun.[1] It is drifting further away with a radial velocity of 6.5 km/s.[4] The star serves as an IAU radial velocity standard.[16]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquarius |
Right ascension | 21h 31m 33.53171s[1] |
Declination | –05° 34′ 16.2320″[1] |
Apparent magnitude (V) | 2.87[2] |
Characteristics | |
Spectral type | G0 Ib[3] |
U−B color index | +0.58[2] |
B−V color index | +0.84[2] |
Astrometry | |
Radial velocity (Rv) | 6.451±0.0627[4] km/s |
Proper motion (μ) | RA: +18.77[1] mas/yr Dec.: −8.21[1] mas/yr |
Parallax (π) | 5.9728 ± 0.2147 mas[5] |
Distance | 541.55+18.39 −15.49 ly (166.12+5.64 −4.75 pc)[6] |
Absolute magnitude (MV) | −3.04[7] |
Details[8] | |
Mass | 4.97±0.10 – 6.3[9] M☉ |
Radius | 47.88+1.68 −1.81 R☉ |
Luminosity | 2046±180 L☉ |
Surface gravity (log g) | 2.05[10] cgs |
Temperature | 5608±71 K |
Metallicity [Fe/H] | –0.03[11] dex |
Rotational velocity (v sin i) | 6.3±1.3[12] km/s |
Age | 56[9] – 110±10 Myr |
Other designations | |
Database references | |
SIMBAD | data |
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