Alpha Aquarii
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 05m 47.03555s |
| Declination | −00° 19′ 11.4634″ |
| Apparent magnitude (V) | 2.942 |
| Characteristics | |
| Evolutionary stage | Yellow supergiant |
| Spectral type | G2 Ib |
| U−B color index | +0.699 |
| B−V color index | +0.971 |
| R−I color index | +0.49 |
| Astrometry | |
| Radial velocity (Rv) | 7.5 km/s |
| Proper motion (μ) | RA: +18.59 mas/yr Dec.: −10.45 mas/yr |
| Parallax (π) | 4.9451±0.4296 mas |
| Distance | 691.1+37.8 −56.1 ly (211.9+11.6 −17.2 pc) |
| Absolute magnitude (MV) | −3.882 |
| Details | |
| Mass | 6.31 M☉ |
| Radius | 70 R☉ |
| Luminosity | 3,917 L☉ |
| Surface gravity (log g) | 1.4 cgs |
| Temperature | 5,190±50 K |
| Metallicity [Fe/H] | +0.17 dex |
| Rotational velocity (v sin i) | 6.7±1.5 km/s |
| Age | 53 Myr |
| Other designations | |
| El Melik, Rucbah, Saad el Melik, Sadalmelek, Sadalmelik, Sadlamulk, α Aqr, Alpha Aquarii, Alpha Aqr, 34 Aquarii, 34 Aqr, BD−01 4246, FK5 827, HD 209750, HIP 109074, HR 8414, SAO 145862 | |
| Database references | |
| SIMBAD | data |
Alpha Aquarii is a yellow supergiant star in the constellation of Aquarius. Its identifier is a Bayer designation that is Latinized from α Aquarii, and is abbreviated Alf Aqr or α Aqr, respectively. This star has the official name Sadalmelik, pronounced /ˌsædəlˈmɛlɪk/. At an apparent visual magnitude of 2.94, it is the second-brightest star in Aquarius, just marginally fainter than Beta Aquarii. Based upon parallax measurements made by the Gaia spacecraft, it is located at a distance of roughly 690 light-years (210 parsecs). It is drifting further away from the Sun with a radial velocity of 7.5 km/s.