Alpha Aquarii
Star in the constellation Aquarius / From Wikipedia, the free encyclopedia
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Alpha Aquarii, officially named Sadalmelik (/ˌsædəlˈmɛlɪk/),[12] is a single star in the constellation of Aquarius. The apparent visual magnitude of 2.94[2] makes this the second-brightest star in Aquarius. Based upon parallax measurements made during the Hipparcos mission, it is located at a distance of roughly 520 light-years (160 parsecs) from the Sun.[1] It is drifting further away from the Sun with a radial velocity of 7.5 km/s.[4]
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Aquarius |
Right ascension | 22h 05m 47.03593s[1] |
Declination | −00° 19′ 11.4568″[1] |
Apparent magnitude (V) | 2.942[2] |
Characteristics | |
Spectral type | G2 Ib[3] |
U−B color index | +0.699[2] |
B−V color index | +0.971[2] |
R−I color index | +0.49[2] |
Astrometry | |
Radial velocity (Rv) | 7.5[4] km/s |
Proper motion (μ) | RA: +18.25[1] mas/yr Dec.: −9.39[1] mas/yr |
Parallax (π) | 6.23 ± 0.19 mas[1] |
Distance | 520 ± 20 ly (161 ± 5 pc) |
Absolute magnitude (MV) | −3.882[5] |
Details | |
Mass | 5.13±0.06[6] M☉ |
Radius | 52.89+1.68 −1.78[6] R☉ |
Luminosity | 2,120±167[6] L☉ |
Surface gravity (log g) | 1.76±0.04[3] cgs |
Temperature | 5,383±74[6] K |
Metallicity [Fe/H] | +0.17[5] dex |
Rotational velocity (v sin i) | 6.7±1.5[7] km/s |
Age | 53[3] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Close
It forms the primary or 'A' component of a double star designated WDS J22058-0019; the secondary or 'B' component is UCAC2 31789179.[13]