| 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 mas [1] |
| Distance | 740 ± 40
ly (230 ± 10 pc) |
| Absolute magnitude (MV) | −1.97 [6] |
| Details | |
| Mass | 7.00±0.43 [7] M☉ |
| Radius | 4.5 [8] R☉ |
| Luminosity | 2,878 [7] L☉ |
| Surface gravity (log g) | 3.859±0.025 [9] cgs |
| Temperature | 18,700 [7] K |
| Rotational velocity (v sin i) | 52±8 [3] km/s |
| Age | 31.6±0.6 [10] Myr |
| Other designations | |
| 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, [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.
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]
- ^ a b c d e f 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.
- ^ a b c d 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.
- ^ a b c d 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.
- ^ a b c d e f 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.
- ^ a b 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.
- ^ a b 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.
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| 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 mas [1] |
| Distance | 740 ± 40
ly (230 ± 10 pc) |
| Absolute magnitude (MV) | −1.97 [6] |
| Details | |
| Mass | 7.00±0.43 [7] M☉ |
| Radius | 4.5 [8] R☉ |
| Luminosity | 2,878 [7] L☉ |
| Surface gravity (log g) | 3.859±0.025 [9] cgs |
| Temperature | 18,700 [7] K |
| Rotational velocity (v sin i) | 52±8 [3] km/s |
| Age | 31.6±0.6 [10] Myr |
| Other designations | |
| 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, [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.
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]
- ^ a b c d e f 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.
- ^ a b c d 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.
- ^ a b c d 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.
- ^ a b c d e f 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.
- ^ a b 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.
- ^ a b 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.
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