Psi Eridani

Psi Eridani, Latinized from ψ Eridani, is a star in the constellation Eridanus. With an apparent visual magnitude is 4.81,[2] it can be seen with the naked eye on a clear, dark night. Based upon an annual parallax shift of 4.41 milliarcseconds,[1] it is located roughly 740 light years away from the Sun.

ψ Eridani
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Eridanus
Right ascension  05h 01m 26.34599s[1]
Declination −07° 10′ 26.2662″[1]
Apparent magnitude (V) 4.81[2]
Characteristics
Spectral type B3 V[3] or B3 IV[4]
U−B color index −0.75[2]
B−V color index −0.19[2]
Astrometry
Radial velocity (Rv)20.7±1.1[5] km/s
Proper motion (μ) RA: +1.71[1] mas/yr
Dec.: +6.29[1] mas/yr
Parallax (π)4.41 ± 0.23[1] mas
Distance740 ± 40 ly
(230 ± 10 pc)
Absolute magnitude (MV)−1.97[6]
Details
Mass7.00±0.43[7] M☉
Radius4.5[8] R☉
Luminosity2,878[7] L☉
Surface gravity (log g)3.859±0.025[9] cgs
Temperature18,700[7] K
Rotational velocity (v sin i)52±8[3] km/s
Age31.6±0.6[10] Myr
Other designations
ψ Eri, BD−07° 948, 65 Eridani, HD 32249, HIP 23364, HR 1617, SAO 131700.[11]
Database references
SIMBADdata

This is a B-type main sequence star with a stellar classification of B3 V.[3] However, Houk and Swift (1999) classed it as a more evolved subgiant star. It is about 32[10] million years old and has a projected rotational velocity of 52 km/s.[3] The estimated mass is seven times that of the Sun,[7] and it has around 4.5 times the Sun's radius.[8] Psi Eridani shines with 2,878[7] times the solar luminosity from its outer atmosphere at an effective temperature of 18,700 K.[7]

References
  1. 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.
  2. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. Bragança, G. A.; et al. (November 2012), "Projected Rotational Velocities and Stellar Characterization of 350 B Stars in the Nearby Galactic Disk", The Astronomical Journal, 144 (5): 10, arXiv:1208.1674, Bibcode:2012AJ....144..130B, doi:10.1088/0004-6256/144/5/130, 130.
  4. Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 05, Bibcode:1999MSS...C05....0H.
  5. Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  6. 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.
  7. Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349–360, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355.
  8. Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy & Astrophysics, 367: 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  9. Huang, Wenjin; et al. (October 2010), "A Stellar Rotation Census of B Stars: From ZAMS to TAMS", The Astrophysical Journal, 722 (1): 605–619, arXiv:1008.1761, Bibcode:2010ApJ...722..605H, doi:10.1088/0004-637X/722/1/605.
  10. Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x
  11. "psi Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-11-03.
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