Rho Boötis: Difference between revisions
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It is an orange [[stellar classification|K-type]] [[giant star|giant]] with an [[apparent magnitude]] of +3.57. There is an optical companion, an eleventh magnitude star, located 42 [[arcsecond]]s away. |
It is an orange [[stellar classification|K-type]] [[giant star|giant]] with an [[apparent magnitude]] of +3.57. There is an optical companion, an eleventh magnitude star, located 42 [[arcsecond]]s away. |
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Along with [[Sigma Bootis]], it shares the traditional name '''Al Hamalain''', from the Arabic الحملين ''al-ħamalayn'' "the two sheep (rams). Specifically, it is '''Hemelein Prima''' to Sigma's Hemelain Secunda, from Latin prīma'' "first"{{ |
Along with [[Sigma Bootis]], it shares the traditional name '''Al Hamalain''', from the Arabic الحملين ''al-ħamalayn'' "the two sheep (rams). Specifically, it is '''Hemelein Prima''' to Sigma's Hemelain Secunda, from Latin prīma'' "first"{{citation needed|date=December 2010}}. |
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In [[Chinese language|Chinese]], {{lang|zh|梗河}} ({{lang|zh-Latn|Gěng Hé}}), meaning ''[[Root (Chinese constellation)|Celestial Lance]]'', refers to an asterism consisting of ρ Boötis, [[Epsilon Boötis|ε Boötis]] and [[Sigma Boötis|σ Boötis]].<ref>{{zh icon}} ''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 9789867332257.</ref> Consequently, ρ Boötis itself is known as {{lang|zh|梗河三}} ({{lang|zh-Latn|Gěng Hé sān}}, {{lang-en|the Third Star of Celestial Lance}}.)<ref>{{zh icon}} [http://aeea.nmns.edu.tw/2006/0606/ap060629.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 29 日]</ref> |
In [[Chinese language|Chinese]], {{lang|zh|梗河}} ({{lang|zh-Latn|Gěng Hé}}), meaning ''[[Root (Chinese constellation)|Celestial Lance]]'', refers to an asterism consisting of ρ Boötis, [[Epsilon Boötis|ε Boötis]] and [[Sigma Boötis|σ Boötis]].<ref>{{zh icon}} ''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 9789867332257.</ref> Consequently, ρ Boötis itself is known as {{lang|zh|梗河三}} ({{lang|zh-Latn|Gěng Hé sān}}, {{lang-en|the Third Star of Celestial Lance}}.)<ref>{{zh icon}} [http://aeea.nmns.edu.tw/2006/0606/ap060629.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 29 日]</ref> |
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<references /> |
<references /> |
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{{Stars of Boötes}} |
{{Stars of Boötes}} |
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[[Category:Flamsteed objects| |
[[Category:Flamsteed objects|Bootis, 25]] |
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[[Category:Henry Draper Catalogue objects|127665]] |
[[Category:Henry Draper Catalogue objects|127665]] |
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[[Category:HIP objects|071053]] |
[[Category:HIP objects|071053]] |
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[[Category:K-type giants|Rho Bootis A]] |
[[Category:K-type giants|Rho Bootis A]] |
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[[Category:Stars with proper names]] |
[[Category:Stars with proper names]] |
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[[es:Rho Bootis]] |
[[es:Rho Bootis]] |
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Revision as of 18:42, 8 December 2010
| 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 | K3III |
| U−B color index | 1.44 |
| B−V color index | 1.3 |
| R−I color index | 0.65 |
| Variable type | Variable star |
| 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) |
| Absolute magnitude (MV) | 4.899 |
| Details | |
| Mass | 0.8 M☉ |
| Radius | 0.9 R☉ |
| Luminosity | 0.4 L☉ |
| Temperature | 3,500–5,000 K |
| Rotational velocity (v sin i) | < 17 km/s |
| 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 constellation Boötes. It is approximately 149 light years from Earth.
It is an orange K-type giant with an apparent magnitude of +3.57. There is an optical companion, an eleventh magnitude star, located 42 arcseconds away.
Along with Sigma Bootis, it shares the traditional name Al Hamalain, from the Arabic الحملين al-ħamalayn "the two sheep (rams). Specifically, it is Hemelein Prima to Sigma's Hemelain Secunda, from Latin prīma "first"[citation needed].
In Chinese, 梗河 (Gěng Hé), meaning Celestial Lance, refers to an asterism consisting of ρ Boötis, ε Boötis and σ Boötis.[1] Consequently, ρ Boötis itself is known as 梗河三 (Gěng Hé sān, English: the Third Star of Celestial Lance.)[2]
References
- ^ Template:Zh icon 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 9789867332257.
- ^ Template:Zh icon 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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