Gamma Piscis Austrini

Gamma Piscis Austrini
Location of γ Piscis Austrini (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
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]
Distance203 ± 6 ly
(62 ± 2 pc)
Absolute magnitude (MV)−0.20/3.50[5]
Details[7]
γ PsA A
Mass2.63 M☉
Surface gravity (log g)3.92 cgs
Temperature10,776±366 K
Rotational velocity (v sin i)47 km/s
Age214 Myr
Other designations
γ PsA, 22 Piscis Austrini, CD−33° 16270, HD 216336, HIP 112948, HR 8695, SAO 214153, WDS J22525-3253AB[8]
Database references
SIMBADγ 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]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Rakos1982 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Abt1995 was invoked but never defined (see the help page).
  5. ^ a b c d e Cite error: The named reference corbally1984 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference David2015 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).