| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 05 01 26.34599 |
| Declination | −07° 10′ 26.2662″ |
| Apparent magnitude (V) | 4.81 |
| Characteristics | |
| Spectral type | B3 V or B3 IV |
| U−B color index | −0.75 |
| B−V color index | −0.19 |
| Astrometry | |
| Radial velocity (Rv) | 20.7±1.1 km/s |
| Proper motion (μ) | RA: +1.71 mas/yr Dec.: +6.29 mas/yr |
| Parallax (π) | 4.41 ± 0.23 mas |
| Distance | 740 ± 40 ly (230 ± 10 pc) |
| Absolute magnitude (MV) | −1.97 |
| Details | |
| Mass | 7.00±0.43 M☉ |
| Radius | 4.5 R☉ |
| Luminosity | 2,878 L☉ |
| Surface gravity (log g) | 3.859±0.025 cgs |
| Temperature | 18,700 K |
| Rotational velocity (v sin i) | 52±8 km/s |
| Age | 31.6±0.6 Myr |
| Other designations | |
| ψ Eri, BD−07° 948, 65 Eridani, HD 32249, HIP 23364, HR 1617, SAO 131700 | |
| Database references | |
| SIMBAD | data |
Psi Eridani, Latinized from ψ Eridani, is a star in the constellation Eridanus. With an apparent visual magnitude is 4.81, it can be seen with the naked eye on a clear, dark night. Based upon an annual parallax shift of 4.41 milliarcseconds, it is located roughly 740 light-years away from the Sun.
This is a B-type main-sequence star with a stellar classification of B3 V. However, Houk and Swift (1999) classed it as a more evolved subgiant star. It is about 32 million years old and has a projected rotational velocity of 52 km/s. The estimated mass is seven times that of the Sun, and it has around 4.5 times the Sun's radius. Psi Eridani shines with 2,878 times the solar luminosity from its outer atmosphere at an effective temperature of 18,700 K.
References
- ^ 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.
- ^ Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
- ^ 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, S2CID 118868235, 130.
- Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 05, Bibcode:1999MSS...C05....0H.
- 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, S2CID 119231169.
- 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.
- ^ 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, S2CID 111387483.
- ^ 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 (2): 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- 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, S2CID 118532653.
- ^ 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, S2CID 118629873
- "psi Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-11-03.
