Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
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Constellation | Piscis Austrinus |
Right ascension | 22h 52m 31.52285s[1] |
Declination | −32° 52′ 31.7041″[1] |
Apparent magnitude (V) | +4.448[2] (4.59 + 8.20)[3] |
Characteristics | |
γ PsA A | |
Spectral type | A0 Vp(SrCrEu)[4] |
U−B color index | −0.038[2] |
B−V color index | −0.046[2] |
γ PsA B | |
Spectral type | F5 V[5] |
U−B color index | −0.08[5] |
B−V color index | +0.44[5] |
Astrometry | |
Radial velocity (Rv) | 16.5±2.7[6] km/s |
Proper motion (μ) | RA: −25.039[1] mas/yr Dec.: −30.933[1] mas/yr |
Parallax (π) | 16.0365 ± 0.4505 mas[1] |
Distance | 203 ± 6 ly (62 ± 2 pc) |
Absolute magnitude (MV) | −0.20/3.50[5] |
Details[7] | |
γ PsA A | |
Mass | 2.63 M☉ |
Surface gravity (log g) | 3.92 cgs |
Temperature | 10,776±366 K |
Rotational velocity (v sin i) | 47 km/s |
Age | 214 Myr |
Other designations | |
Database references | |
SIMBAD | γ PsA |
γ PsA A | |
γ PsA B |
Gamma Piscis Austrini, Latinized from γ Piscis Austrini, is binary star[3] system in the southern constellation of Piscis Austrinus. It is visible to the naked eye with a combined apparent visual magnitude of +4.448.[2] As of 2010, the pair had an angular separation of 4 arc seconds along a position angle of 255°.[9] Based upon an annual parallax shift of 16.0 mas as seen from the Earth,[1] the system is located about 203 light years from the Sun.
The magnitude 4.59[3] primary, component A, is a white-hued, chemically peculiar A-type main sequence star with a stellar classification of A0 Vp(SrCrEu).[4] It is an estimated 214 million years old with 2.63 times the mass of the Sun. The fainter magnitude 8.20[3] companion, component B, is an F-type main sequence star with a class of F5 V.[5]
Gamma Piscis Austrini is moving through the Galaxy at a speed of 24.1 km/s relative to the Sun. Its projected Galactic orbit carries it between 21,605 and 30,903 light-years from the center of the Galaxy. It came closest to the Sun 1.8 million years ago at a distance of 157 light-years.[10]
In Chinese, 敗臼 (Bài Jiù), meaning Decayed Mortar, refers to an asterism consisting of refers to an asterism consisting of γ Piscis Austrini, γ Gruis, λ Gruis and 19 Piscis Austrini. Consequently, the Chinese name for γ Piscis Austrini itself is 敗臼三 (Bài Jiù sān, English: the Third Star of Decayed Mortar.)[11]
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