Alpha Piscium

α Piscium
Location of α Piscium (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pisces
Right ascension 02h 02m 02.81972s[1]
Declination +02° 45′ 49.5410″[1]
Apparent magnitude (V) 3.82 (4.33 + 5.23)[2]
Characteristics
Spectral type kA0hA7 Sr + kA2hF2mF2 (IV)[3]
Variable type α2 CVn[4]
Astrometry
Proper motion (μ) RA: +32.45[1] mas/yr
Dec.: +0.04[1] mas/yr
Parallax (π)21.66 ± 1.06 mas[1]
Distance151 ± 7 ly
(46 ± 2 pc)
Absolute magnitude (MV)+0.50[5]
Orbit[6]
Period (P)3267.4 yr
Semi-major axis (a)7.4″
Eccentricity (e)0.465
Inclination (i)113.4°
Longitude of the node (Ω)3.70°
Periastron epoch (T)2188.6
Argument of periastron (ω)
(secondary)		147.9°
Details
α Psc A
Mass2.55±0.11[7] M☉
Radius2.45[8] R☉
Luminosity55+14
−11[7] L☉
Surface gravity (log g)3.85[8] cgs
Temperature10,233+507
−483[7] K
Rotational velocity (v sin i)81[9] km/s
α Psc B
Mass2.64+0.21
−0.28[10] M☉
Radius2.66±0.45[10] R☉
Luminosity63+13
−11[10] L☉
Surface gravity (log g)4.01±0.14[10] cgs
Temperature10,000±710[10] K
Rotational velocity (v sin i)84[9] km/s
Age331+159
−153[10] Myr
Other designations
Alrischa, Kaitain, Okda, Okdah, Syndesmos, α Psc, 113 Piscium, BD+02°317, FK5 28, HIP 9487, SAO 110291, WDS J02020+0246AB[11][12]
α Psc A: HD 12447, HR 596[13]
α Psc B: HD 12446, HR 595[14]
Database references
SIMBADα Psc
α Psc A
α Psc B

Alpha Piscium (α Piscium) is a binary star[6] system in the equatorial constellation of Pisces. Based upon parallax measurements made by the Hipparcos spacecraft, it is about 151 light-years from the Solar System.

The two components are designated Alpha Piscium A (officially named Alrescha /ælˈriːʃə/, the traditional name of the system)[15][16] and B.

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Gray1989 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Hartkopf2006 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference netopil2017 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference glagolevskij2019 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Royer2002 was invoked but never defined (see the help page).
  10. ^ a b c d e f Cite error: The named reference sikora2019 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Peterson, Hannah Mary Bouvier (1856). Familiar Astronomy, Or, An Introduction to the Study of the Heavens. London: Princeton University. p. 434.
  13. ^ Cite error: The named reference SIMBAD_A was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference SIMBAD_B was invoked but never defined (see the help page).
  15. ^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
  16. ^ Cite error: The named reference IAU-LSN was invoked but never defined (see the help page).