Kappa 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 |
| 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 |
| 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 L☉ |
| Temperature | 7,760 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
|
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
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") 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".
In Chinese, 梗河 (Tiān Qiāng), meaning Celestial Spear, refers to an asterism consisting of κ (actually κ2) Boötis, ι Boötis and θ Boötis. Consequently, κ Boötis itself is known as 天槍一 (Tiān Qiāng yī, English: the First Star of Celestial Spear.)
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 is classified as a Delta Scuti type variable star with a period of 1.08 hours Its brightness varies from magnitude +4.50 to +4.58. HR 5328
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