Epsilon Piscis Austrini

Epsilon Piscis Austrini, also known as ε Piscis Austrini, is a blue-white star in the constellation of Piscis Austrinus. It can be seen with the naked eye and has an apparent visual magnitude of +4.17.[1] The system is located about 400 light years from the Sun and has an annual parallax shift of 8.0981 ± 0.3582 mas as seen from the GAIA satellite.[2]

Epsilon Piscis Austrini
Piscis Austrinus IAU.svg
 <div style="position: relative; z-index: 3; line-height: 0; text-align: center;
 width: px;
 left: -Expression error: Unexpected / operator.px;
top: -Expression error: Unexpected / operator.px;">[[File:|px||link=]]
Location of ε Piscis Austrini (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Piscis Austrinus
Right ascension 22h 40m 39.34075s[3]
Declination −27° 02′ 37.0157″[3]
Apparent magnitude (V) +4.17[1]
Characteristics
Spectral type B8 Ve[4] or B8 IVe[5]
U−B color index −0.31[1]
B−V color index −0.11[1]
Astrometry
Radial velocity (Rv)+1.1±2.8 km/s
Proper motion (μ) RA: +23.22[3] mas/yr
Dec.: −0.16[3] mas/yr
Parallax (π)8.0981 ± 0.3582[2] mas
Distance400 ± 20 ly
(123 ± 5 pc)
Absolute magnitude (MV)−1.66[5]
Details
Mass4.10±0.19[6] M
Radius3.2[7] R
Luminosity661[6] L
Surface gravity (log g)3.93[8] cgs
Temperature11,066[6] K
Rotational velocity (v sin i)216[6] km/s
Other designations
ε PsA, 18 Piscis Austrini, CPD−27° 7442, FK5 854, HD 214748, HIP 111954, HR 8628, SAO 191318[9]
Database references
SIMBADdata

References

  1. 1.0 1.1 1.2 1.3 Feinstein, A.; Marraco, H. G. (November 1979), "The photometric behavior of Be Stars", Astronomical Journal, 84: 1713–1725, Bibcode:1979AJ.....84.1713F, doi:10.1086/112600.
  2. 2.0 2.1 Template:Cite DR2
  3. 3.0 3.1 3.2 3.3 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  4. Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
  5. 5.0 5.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  6. 6.0 6.1 6.2 6.3 Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
  7. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (3rd ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  8. Chauville, J.; et al. (November 2001), "High and intermediate-resolution spectroscopy of Be stars 4481 lines", Astronomy and Astrophysics, 378: 8618–82, Bibcode:2001A&A...378..861C, doi:10.1051/0004-6361:20011202.
  9. "eps PsA -- Be Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-05-18.