Beta Piscis Austrini

Beta Piscis Austrini
Location of β Piscis Austrini (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Piscis Austrinus
Right ascension 22h 31m 30.33038s[1]
Declination −32° 20′ 45.8653″[1]
Apparent magnitude (V) +4.29[2] (4.29 + 6.22)[3]
Characteristics
Spectral type A1 V[4] + A2 V[5][6]
U−B color index +0.02[2]
B−V color index +0.01[2]
Astrometry
Radial velocity (Rv)5.5±0.5[7] km/s
Proper motion (μ) RA: +59.12[1] mas/yr
Dec.: −18.83[1] mas/yr
Parallax (π)22.84 ± 0.21 mas[1]
Distance143 ± 1 ly
(43.8 ± 0.4 pc)
Absolute magnitude (MV)1.00[8]
Details
Mass2.33±0.07[8] M☉
Radius2.10[9] R☉
Luminosity37[8] L☉
Surface gravity (log g)4.12±0.03[8] cgs
Temperature9,638[9] K
Rotational velocity (v sin i)30[4] km/s
Age339[8] Myr
Other designations
β PsA, 17 Piscis Austrini, CPD−32° 6506, FK5 1592, HD 213398, HIP 111188, HR 8576, SAO 213883, WDS J22315-3221A[10]
Database references
SIMBADdata

Beta Piscis Austrini, Latinized from β Piscis Austrini, is catalogued as a binary star[5][6] system in the southern constellation of Piscis Austrinus. It is visible to the naked eye with an apparent visual magnitude of +4.29.[2] Based upon an annual parallax shift of 22.84 mas as seen from the Earth,[1] the star is located 143 light years from the Sun. These coordinates are a source of X-ray emission with a luminosity of 88.5×1020 W, which is most likely coming from a source other than the A-type stars.[11]

Oblak (1978) identified this as a triple star system,[3] although subsequent sources list it as a binary.[5][6] The magnitude 4.29[3] primary, component A, is a white-hued A-type main sequence star with a stellar classification of A1 V.[4] It has an estimated 2.3[8] times the mass of the Sun and 2.1[9] times the Sun's radius. The star is radiating 37[8] times the solar luminosity from its photosphere at an effective temperature of 9,638 K.[9] There is evidence for an infrared excess, indicating the presence of an orbiting debris disk. This has an estimated temperature of 188 K, indicating an orbital distance of 12 AU from the host star.[9] The magnitude 7.8 secondary, component B, has a class of A2 V and lies at an angular separation of 30.3 arc seconds.[5][6]

Beta Piscis Austrini is moving through the Galaxy at a speed of 14.4 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,901 and 28,366 light-years from the center of the Galaxy.[12]

With Delta and Zeta it constituted Tien Kang ("heavenly rope") in China.[13][14]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Nicolet1978 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Oblak1978 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Royer2007 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Rodriguez2015 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  8. ^ a b c d e f g Cite error: The named reference Gerbaldi1999 was invoked but never defined (see the help page).
  9. ^ a b c d e Cite error: The named reference Patel2014 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Schroeder2007 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Allen1963 was invoked but never defined (see the help page).
  14. ^ Tien Kang was possibly derived from 天綱 (Tiān Gāng) meaning Materials for Making Tents. AEEA opinion is, δ Piscis Austrini marking itself and stand alone in this asterism. See (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 6 日.