Epsilon Piscis Austrini

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

Epsilon Piscis Austrini, Latinized from ε Piscis Austrini, is a blue-white hued star in the southern constellation of Piscis Austrinus. It is visible to the naked eye with an apparent visual magnitude of +4.17.[2] Based upon an annual parallax shift of 8.0981 ± 0.3582 mas as seen from the Gaia satellite, the system is located roughly 400 light years from the Sun.[6]

This is a B-type main sequence star with a stellar classification of B8 Ve.[3] It is a Be star that is spinning rapidly with a projected rotational velocity of 216 km/s,[7] compared to an equatorial critical velocity of 301 km/s.[9] The star has 4.1 times the mass of the Sun and is radiating 661 times the solar luminosity from its photosphere at an effective temperature of 11,066 K.[7]

Epsilon Piscis Austrini is moving through the Galaxy at 18.7 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,917 and 28,138 light-years from the center of the Galaxy.[11]

  1. ^ a b c d 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 Feinstein1979 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Abt2002 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  7. ^ a b c d e f Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference PasinettiFracassini2001 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Chauville2001 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 Anderson_Francis_2012 was invoked but never defined (see the help page).