Eta Persei
 
| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 02h 50m 41.80959s[1] |
| Declination | +55° 53′ 43.7876″[1] |
| Apparent magnitude (V) | 3.79[2] |
| Characteristics | |
| Spectral type | K3 Ib[3] |
| U−B color index | +1.90[2] |
| B−V color index | +1.69[2] |
| Astrometry | |
| Radial velocity (Rv) | −1.07 ± 0.27[4] km/s |
| Proper motion (μ) | RA: +16.23[1] mas/yr Dec.: −13.54[1] mas/yr |
| Parallax (π) | 3.71 ± 0.27[1] mas |
| Distance | 880 ± 60 ly (270 ± 20 pc) |
| Absolute magnitude (MV) | −4.29[5] |
| Details | |
| Radius | 44[6] R☉ |
| Luminosity | 5,135[7] L☉ |
| Temperature | 4,047[7] K |
| Rotational velocity (v sin i) | 5.8[3] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Eta Persei (Eta Per, η Persei, η Per) is a star in the constellation Perseus. It belongs to spectral class K3 and has an apparent magnitude of +3.76. It is approximately 1331 light years away from Earth. This star is radiating 35,000 times the luminosity of the Sun.[8]
Name and etymology
- This star, together with δ Per, ψ Per, σ Per, α Per and γ Per has been called the Segment of Perseus.[9]
- In Chinese, 天船 (Tiān Chuán), meaning Celestial Boat, refers to an asterism consisting of η Persei, γ Persei, α Persei, ψ Persei, δ Persei, 48 Persei, μ Persei and HD 27084. Consequently, η Persei itself is known as 天船一 (Tiān Chuán yī, English: the First Star of Celestial Boat.)[10]
References
- 1 2 3 4 5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- 1 2 3 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237. Bibcode:2002yCat.2237....0D.
- 1 2 De Medeiros, J. R.; Udry, S.; Burki, G.; Mayor, M. (2002). "A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars". Astronomy and Astrophysics 395: 97. Bibcode:2002A&A...395...97D. doi:10.1051/0004-6361:20021214.
- ↑ Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics 430: 165. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272.
- ↑ Ryon, Jenna; Shetrone, Matthew D.; Smith, Graeme H. (2009). "Comparing the Ca ii H and K Emission Lines in Red Giant Stars". Publications of the Astronomical Society of the Pacific 121 (882): 842. arXiv:0907.3346. Bibcode:2009PASP..121..842R. doi:10.1086/605456.
- ↑ Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy and Astrophysics 367 (2): 521. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451.
- 1 2 McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society 427: 343. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.
- ↑ Mallik, Sushma V. (December 1999), "Lithium abundance and mass", Astronomy and Astrophysics 352: 495–507, Bibcode:1999A&A...352..495M
- ↑ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York: Dover Publications Inc. p. 331. ISBN 0-486-21079-0. Retrieved 2012-09-04.
- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日
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