Location of κ Boötis (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| κ Boötis | |
| Right ascension | 14 13 27.824 |
| Declination | +51° 47′ 16.62″ |
| Apparent magnitude (V) | +6.69 |
| κ Boötis | |
| Right ascension | 14 13 29.009 |
| Declination | +51° 47′ 23.88″ |
| Apparent magnitude (V) | +4.50 to +4.58 |
| Characteristics | |
| κ Boötis | |
| Spectral type | F2V |
| κ Boötis | |
| 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 | |
| κ Boötis | |
| Radial velocity (Rv) | −22.09 km/s |
| Proper motion (μ) | RA: 44.094 mas/yr Dec.: −39.325 mas/yr |
| Parallax (π) | 20.3067 ± 0.2221 mas |
| Distance | 161 ± 2 ly (49.2 ± 0.5 pc) |
| Absolute magnitude (MV) | +3.34 |
| κ Boötis | |
| Radial velocity (Rv) | −15.60 km/s |
| Proper motion (μ) | RA: 44.094 mas/yr Dec.: −39.325 mas/yr |
| Parallax (π) | 21.1980 ± 0.4118 mas |
| Distance | 154 ± 3 ly (47.2 ± 0.9 pc) |
| Details | |
| κ Boötis | |
| Mass | 1.40 M☉ |
| Radius | 1.43 R☉ |
| Luminosity | 3.801 L☉ |
| Surface gravity (log g) | 4.32 cgs |
| Temperature | 6,699 K |
| Metallicity | −0.09 dex |
| Rotational velocity (v sin i) | 38 km/s |
| Age | 900 Myr |
| κ Boötis | |
| Mass | 2.12 M☉ |
| Radius | 2.78 R☉ |
| Luminosity | 28 L☉ |
| Surface gravity (log g) | 3.66 cgs |
| Temperature | 7,760 K |
| Metallicity | −0.29 dex |
| Rotational velocity (v sin i) | 128 km/s |
| Other designations | |
| Asellus Tertius, κ Boo, 17 Boötis, BD+52 1782, HR 5328 | |
| κ Boötis: HD 124674, HIP 69481, SAO 29045 | |
| κ Boötis: HD 124675, HIP 69483, SAO 29046 | |
| Database references | |
| SIMBAD | data |
| κ | |
| κ | |
Kappa Boötis (κ Boo, κ Boötis) is a double star in the constellation Boötes. It has the traditional name Asellus Tertius /əˈsɛləs ˈtɜːrʃiəs/ (Latin for "third donkey colt") and the Flamsteed designation 17 Boötis. The components are separated by an angular distance of 13.5 arcsec, viewable in a small telescope. Kappa Boötis is approximately 155 light years from Earth.
Nomenclature
κ Boötis, the brighter star of the pair, is also designated HD 124675, while κ Boötis is HD 124674. The two stars share the Bright Star Catalogue designation HR 5328, but they have separate entries in the Hipparcos catalogue: HIP 69483 and HIP 69481 respectively.
Properties
κ Boötis is a spectroscopic binary star system. The visible primary is an F2 main sequence star, while the secondary is half the mass and much fainter.
κ 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. It is a slightly evolved A8 subgiant.
A 17th-magnitude star nearly two arc-minutes away has been identified as a member of the multiple system with an estimated orbital period of 177,000 years. It is itself a close binary with two similar low-mass stars in a 234-year orbit.
Etymology
This star, along with the other Aselli (θ Boo and ι Boo) and λ Boo, were Aulād al Dhiʼbah (أولاد الضّباع - awlād al-ḍibā‘), "the Whelps of the Hyenas".
In Chinese, 天槍 (Tiān Qiāng), meaning Celestial Spear, refers to an asterism consisting of κ (actually κ) Boötis, ι Boötis and θ Boötis. Consequently, the Chinese name for κ Boötis itself is 天槍一 (Tiān Qiāng yī, English: the First Star of Celestial Spear.)
References
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