Rho Boötis
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 31m 49.7899s |
| Declination | +30° 22′ 17.174″ |
| Apparent magnitude (V) | 3.583 |
| Characteristics | |
| Spectral type | K3 III |
| U−B color index | 1.44 |
| B−V color index | 1.3 |
| R−I color index | 0.65 |
| Astrometry | |
| Radial velocity (Rv) | –13.7 km/s |
| Proper motion (μ) | RA: –100.44 mas/yr Dec.: +120.22 mas/yr |
| Parallax (π) | 21.92 ± 0.81 mas |
| Distance | 149 ± 5 ly (46 ± 2 pc) |
| Details | |
| Mass | 1.0–1.4[1] M☉ |
| Radius | 21.57 ± 0.25[1] R☉ |
| Luminosity | 131.9 ± 6.8[1] L☉ |
| Temperature | 4,298 ± 56[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
Rho Boötis (ρ Boo, ρ Boötis) is a star in the northern constellation Boötes. Based upon parallax measurements, it is located at a distance of approximately 149 light-years (46 parsecs) from Earth.
This is an orange K-type giant with an apparent magnitude of +3.57. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.[2] There is an optical companion, an eleventh magnitude star, located 42 arcseconds away.
In Chinese, 梗河 (Gěng Hé), meaning Celestial Lance, refers to an asterism consisting of ρ Boötis, ε Boötis and σ Boötis.[3] Consequently, ρ Boötis itself is known as 梗河三 (Gěng Hé sān, English: the Third Star of Celestial Lance.)[4]
References
- ↑ 1.0 1.1 1.2 1.3 Berio, P. et al. (November 2011), "Chromosphere of K giant stars. Geometrical extent and spatial structure detection", Astronomy & Astrophysics 535: A59, arXiv:1109.5476, Bibcode:2011A&A...535A..59B, doi:10.1051/0004-6361/201117479
- ↑ Garrison, R. F. (December 1993), "Anchor Points for the MK System of Spectral Classification", Bulletin of the American Astronomical Society 25: 1319, Bibcode:1993AAS...183.1710G, retrieved 2012-02-04
- ↑ (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) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 29 日
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