Kappa Boötis
Kappa Boötis (κ Boo, κ Boötis) is a double star in the constellation Boötes. It has the traditional name Asellus Tertius (Latin for "third donkey colt")[1] and the Flamsteed designation 17 Boötis. The components are separated by an angular distance of 13.4, viewable in a small telescope. Kappa Boötis is approximately 155 light years from Earth.
This star, along with the other Aselli (θ Boo and ι Boo) and λ Boo, were Aulād al Dhiʼbah (أولاد الضّباع - aulād al dhiʼba), "the Whelps of the Hyenas".[2]
In Chinese, 梗河 (Tiān Qiāng), meaning Celestial Spear, refers to an asterism consisting of κ (actually κ2) Boötis, ι Boötis and θ Boötis.[3] Consequently, κ Boötis itself is known as 天槍一 (Tiān Qiāng yī, English: the First Star of Celestial Spear.)[4]
κ1 Boötis
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 13m 27.7s |
| Declination | +51° 47′ 16″ |
| Apparent magnitude (V) | +4.53, +6.62 |
| Distance | 155 ± 6 ly (48 ± 2 pc) |
| Spectral type | F1V |
| Database references | |
| SIMBAD | data |
Kappa Boötis is a double star viewable in small telescope, with components separated by an angular distance of 13.4 arcseconds. The primary star, κ² Boötis, has apparent magnitude +4.54 and spectral class A8IV. HR 5329
κ2 Boötis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 13m 29.0078s |
| Declination | +51° 47′ 23.874″ |
| Apparent magnitude (V) | +4.50 to +4.58 |
| Characteristics | |
| Spectral type | A8IV[5] |
| U−B color index | 0.14 |
| B−V color index | 0.2 |
| R−I color index | 0.12 |
| Variable type | Delta Scuti variable |
| Astrometry | |
| Radial velocity (Rv) | -17.4 km/s |
| Proper motion (μ) | RA: 61.39 mas/yr Dec.: -10.57 mas/yr |
| Parallax (π) | 21.03 ± 0.83 mas |
| Distance | 155 ± 6 ly (48 ± 2 pc) |
| Details | |
| Luminosity | 28[5] L☉ |
| Temperature | 7,760[5] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
κ2 Boötis is classified as a Delta Scuti type variable star with a period of 1.08 hours[5] Its brightness varies from magnitude +4.50 to +4.58. HR 5328
References
- ↑ Star Name - R.H.Allen p.105
- ↑ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York: Dover Publications Inc. p. 105. ISBN 0-486-21079-0. Retrieved 2010-12-12.
- ↑ (in 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.
- ↑ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived 2010-08-11 at the Wayback Machine., Hong Kong Space Museum. Accessed on line November 23, 2010.
- 1 2 3 4 Balona, L. A.; Dziembowski, W. A. (October 1999), "Excitation and visibility of high-degree modes in stars", Monthly Notices of the Royal Astronomical Society, 309 (1): 221–232, Bibcode:1999MNRAS.309..221B, doi:10.1046/j.1365-8711.1999.02821.x