Gamma Aquarii
Star in the constellation Aquarius / From Wikipedia, the free encyclopedia
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Gamma Aquarii, or γ Aquarii, is a suspected binary star system in the constellation of Aquarius. It has an apparent visual magnitude of 3.849,[2] making it one of the brighter members of the constellation. Based upon parallax measurements taken during the Hipparcos mission, this star is located at a distance of approximately 164 light-years (50 parsecs) from the Sun.[1] It is drifting closer to the Sun with a radial velocity of −16 km/s.[4] In 1998, Olin J. Eggen included this star as a candidate member of the Hyades Supercluster.[5]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquarius |
Right ascension | 22h 21m 39.37542s[1] |
Declination | –01° 23′ 14.4031″[1] |
Apparent magnitude (V) | 3.849[2] |
Characteristics | |
Spectral type | A0 V[3] |
U−B color index | –0.092[2] |
B−V color index | –0.060[2] |
Astrometry | |
Radial velocity (Rv) | −15.7±0.9[4] km/s |
Proper motion (μ) | RA: +129.53[1] mas/yr Dec.: +7.77[1] mas/yr |
Parallax (π) | 19.92 ± 1.04 mas[1] |
Distance | 164 ± 9 ly (50 ± 3 pc) |
Absolute magnitude (MV) | +0.10[5] |
Details | |
Mass | 2.49[6] M☉ |
Surface gravity (log g) | 3.99±0.14[6] cgs |
Temperature | 10,637±362[6] K |
Metallicity [Fe/H] | +0.30[7] dex |
Rotational velocity (v sin i) | 80[8] km/s |
Age | 158[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Gamma Aquarii is the primary or 'A' component of a double star designated WDS J22217-0123.[10] The secondary or 'B' component is UCAC2 31430071.[11] Gamma Aquarii A's two purported components are therefore designated WDS J22217-0123 Aa and Ab. Gamma Aquarii is traditionally also called Sadachbia /səˈdækbiə/,[12] a name now formally restricted to γ Aqr Aa.[13]