Upsilon2 Eridani
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Eridanus |
| Right ascension | 04h 35m 33.0385s[1] |
| Declination | −30° 33′ 44.429″[1] |
| Apparent magnitude (V) | 3.817[1] |
| Characteristics | |
| Spectral type | G8IIIa[1] |
| U−B color index | +0.72[2] |
| B−V color index | +0.98[2] |
| R−I color index | +0.49[2] |
| Astrometry | |
| Radial velocity (Rv) | −4.0 ± 0.9[1] km/s |
| Proper motion (μ) | RA: −48.92[1] mas/yr Dec.: −12.75[1] mas/yr |
| Parallax (π) | 15.62 ± 0.63[1] mas |
| Distance | 209 ± 8 ly (64 ± 3 pc) |
| Absolute magnitude (MV) | 0.91 ± 0.07[3] |
| Details | |
| Mass | 1.38 ± 0.19[3] M☉ |
| Radius | 11.4 ± 0.6[3] R☉ |
| Surface gravity (log g) | 2.43 ± 0.09[3] cgs |
| Temperature | 4522[3] K |
| Metallicity [Fe/H] | +0.24[3] dex |
| Age | 3.12 ± 1.15[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Upsilon2 Eridani (Upsilon2 Eri, υ2 Eridani, υ2 Eri) is a G-type giant star in the constellation of Eridanus.[1] It has an apparent visual magnitude of approximately 3.817 and is approximately 209 light-years from the Earth.[1] It also has the names Theemim (also Theemin) and Beemin.[2][4]
In Chinese, 天園 (Tiān Yuán), meaning Celestial Orchard, refers to an asterism consisting of υ2 Eridani, χ Eridani, φ Eridani, κ Eridani, HD 16754, HD 23319, θ Eridani, HD 24072, HD 24160, υ4 Eridani, 43 Eridani and υ1 Eridani.[5] Consequently, υ2 Eridani itself is known as 天園十二 (Tiān Yuán shíèr, English: the Twelfth Star of Celestial Orchard.)[6]
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 * 52 Eri -- Star, database entry, SIMBAD. Accessed on line September 25, 2008.
- ↑ 2.0 2.1 2.2 2.3 2.4 HR 1464, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 25, 2008.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 p. 123, The Cambridge Guide to the Constellations, Michael E. Bakich, Cambridge University Press, 1995, ISBN 0-521-44921-9.
- ↑ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
- ↑ (Chinese) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.
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