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. This pair isviewable in small telescope, with components separated by an angular distance of 13.4. Kappa Boötis is approximately 155 light years from Earth.
This star, along with the other Asselus (θ Boo and ι Boo) and λ Boo, were Al Aulād al Dhiʼbah (ألعولد ألذعب - al aulād al dhiʼb), "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, θ Boötis itself is known as 天槍一 (Tiān Qiāng yī, English: the First Star of Celestial Spear.)[4]
Contents |
[edit] 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.
[edit] 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.
[edit] 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 0486210790. http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Bootes*.html. Retrieved 2010-12-12.
- ^ (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 9789867332257.
- ^ (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.
- ^ a b c d 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
[edit] External links
|
||||||||||||||
 |
This binary or multiple star system-related article is a stub. You can help Wikipedia by expanding it. |
