Gamma Aquarii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 21m 39.37542s |
| Declination | −01° 23′ 14.4031″ |
| Apparent magnitude (V) | 3.849 |
| Characteristics | |
| Spectral type | A0 V |
| U−B color index | −0.092 |
| B−V color index | −0.060 |
| Astrometry | |
| Radial velocity (Rv) | −15.7±0.9 km/s |
| Proper motion (μ) | RA: +129.53 mas/yr Dec.: +7.77 mas/yr |
| Parallax (π) | 19.92±1.04 mas |
| Distance | 164 ± 9 ly (50 ± 3 pc) |
| Absolute magnitude (MV) | +0.10 |
| Details | |
| Aa | |
| Mass | 2.72±0.04 M☉ |
| Radius | 2.7 R☉ |
| Surface gravity (log g) | 3.99±0.14 cgs |
| Temperature | 10,637±362 K |
| Metallicity [Fe/H] | +0.30 dex |
| Rotational velocity (v sin i) | 80 km/s |
| Age | 280±20 Myr |
| Ab | |
| Mass | 0.56 M☉ |
| Radius | 0.5 R☉ |
| Temperature | 3,900 K |
| Other designations | |
| Sadalachbia, Sadachbia, Gamma Aqr, γ Aqr, 48 Aquarii, BD−02°5741, FK5 842, HD 212061, HIP 110395, HR 8518, SAO 146044, ADS 15864, WDS J22217-0123A | |
| Database references | |
| SIMBAD | data |
Gamma Aquarii, or γ Aquarii, is a binary star system in the constellation of Aquarius. It has an apparent visual magnitude of 3.849, making it one of the brighter members of the constellation. Based upon parallax measurements, this star is located at a distance of 164 light-years (50 parsecs). It is drifting closer to Earth with a radial velocity of −16 km/s. It is a candidate member of the Hyades Supercluster.
The two components are designated Gamma Aquarii Aa, formally called Sadachbia /səˈdækbiə/, and Ab.