8 Persei
8 Persei is a single[8] star in the northern constellation of Perseus,[7] located 416 light years away from the Sun.[1] It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.757.[2] There is an estimated 52% chance that the star may be a member of the Hyades–Pleiades stream of co-moving stars.[9]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Perseus |
| Right ascension | 02h 17m 59.88750s[1] |
| Declination | +57° 53′ 59.3529″[1] |
| Apparent magnitude (V) | 5.757[2] |
| Characteristics | |
| Spectral type | K3 III[3] |
| B−V color index | 1.203[2] |
| Astrometry | |
| Radial velocity (Rv) | 0.72[2] km/s |
| Proper motion (μ) | RA: +60.568[1] mas/yr Dec.: +5.812[1] mas/yr |
| Parallax (π) | 7.8492 ± 0.1017[1] mas |
| Distance | 416 ± 5 ly (127 ± 2 pc) |
| Absolute magnitude (MV) | 0.26[4] |
| Details | |
| Mass | 1.83[2] M☉ |
| Radius | 15.85±0.99[5] R☉ |
| Luminosity | 107.95±1.69[1] L☉ |
| Surface gravity (log g) | 2.3[5] cgs |
| Temperature | 4,560+92 −86[1] K |
| Metallicity [Fe/H] | −0.07[5] dex |
| Rotational velocity (v sin i) | 1.0[6] km/s |
| Age | 2.36[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
With an age of over two billion years,[2] this is an aging red giant of spectral type K3 III,[3] a star that has used up its core hydrogen and is expanding. It has 1.83[2] times the mass of the Sun and has reached nearly 16[5] times the Sun's size. The star is radiating 108[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,560 K.[1]
References
- 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.
- Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88.
- Appenzeller, Immo (April 1967), "MK Spectral Types for 185 Bright Stars", Publications of the Astronomical Society of the Pacific, 79 (467): 102, Bibcode:1967PASP...79..102A, doi:10.1086/128449
- 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.
- Baines, Ellyn K.; et al. (September 2016), "Spectroscopic and Interferometric Measurements of Nine K Giant Stars", The Astronomical Journal, 152 (3): 8, arXiv:1609.02379, Bibcode:2016AJ....152...66B, doi:10.3847/0004-6256/152/3/66, 66.
- De Medeiros, J. R.; et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics, 363: 239–243, arXiv:astro-ph/0010273, Bibcode:2000A&A...363..239D.
- "8 Per". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-28.
- Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
- Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272.
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