Gamma Aquarii
 Location of γ Aquarii (circled) |
|
| 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 km/s |
| Proper motion (μ) |
RA: +129.53 mas/yr Dec.: +7.77 mas/yr |
| Parallax (π) | 19.92 ± 1.04mas |
| Distance | 164 ± 9 ly (50 ± 3 pc) |
| Details | |
| Surface gravity (log g) | 4.0 cgs |
| Temperature | 10,500 K |
| Metallicity [Fe/H] | +0.30 dex |
| Rotational velocity (v sin i) | 80 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Gamma Aquarii (γ Aquarii, abbreviated Gamma Aqr, γ Aqr), also named Sadachbia, is a binary star 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 roughly 164 light-years (50 parsecs) from the Sun, with an error margin of 5%. The star is a spectroscopic binary with a period of 58.1 days.
γ Aquarii (Latinised to Gamma Aquarii) is the system's Bayer designation.
It bore the traditional name Sadachbia, from an Arabic expression سعد الأخبية (sa‘d al-’axbiyah), meaning "luck of the homes (tents)". In Hindi it is also called Satabhishaj (a hundred physicians); it is called Sadhayam in Tamil. In the catalogue of stars in the Calendarium of Al Achsasi Al Mouakket, this star was designated Aoul al Achbiya (أول ألأجبية - awwil al ahbiyah), which was translated into Latin as Prima Tabernaculorum, meaning the first of luck of the homes (tents). In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. The WGSN approved the name Sadachbia for this star on 21 August 2016, and it is now so entered in the IAU Catalog of Star Names.
This star, along with Pi Aquarii (Seat), Zeta Aquarii (Sadaltager / Achr al Achbiya) and Eta Aquarii (Hydria), were al Aḣbiyah (الأخبية), "the Tent".
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