Kappa Boötis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| κ1 Boötis | |
| Right ascension | 14h 13m 27.824s |
| Declination | +51° 47′ 16.62″ |
| Apparent magnitude (V) | +6.69 |
| κ2 Boötis | |
| Right ascension | 14h 13m 29.008s |
| Declination | +51° 47′ 23.88″ |
| Apparent magnitude (V) | +4.50 to +4.58 |
| Characteristics | |
| κ1 Boötis | |
| Spectral type | F2V |
| B−V color index | 0.394±0.005 |
| κ2 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 | |
| κ1 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) | +3.29 |
| κ2 Boötis | |
| Radial velocity (Rv) | −15.60 km/s |
| Proper motion (μ) | RA: 61.899 mas/yr Dec.: −9.615 mas/yr |
| Parallax (π) | 20.1530 ± 0.0943 mas |
| Distance | 161.8 ± 0.8 ly (49.6 ± 0.2 pc) |
| Details | |
| κ1 Boötis A | |
| Mass | 1.40±0.02 M☉ |
| Radius | 1.43+0.05 −0.10 R☉ |
| Luminosity | 3.801+0.083 −0.082 L☉ |
| Surface gravity (log g) | 4.32 cgs |
| Temperature | 6,744+254 −108 K |
| Metallicity [Fe/H] | −0.09 dex |
| Rotational velocity (v sin i) | 38 km/s |
| Age | 900 Myr |
| κ2 Boötis | |
| Mass | 2.12 M☉ |
| Radius | 2.78 R☉ |
| Luminosity | 28 L☉ |
| Surface gravity (log g) | 3.66 cgs |
| Temperature | 7,760 K |
| Metallicity [Fe/H] | −0.29 dex |
| Rotational velocity (v sin i) | 128 km/s |
| Other designations | |
| Asellus Tertius, κ Boo, 17 Boötis, BD+52 1782, HR 5328, WDS J14135+5147 | |
| κ1 Boötis: GC 19204, HD 124674, HIP 69481, SAO 29045, PPM 34402 | |
| κ2 Boötis: GC 19207, HD 124675, HIP 69483, SAO 29046, PPM 34403 | |
| Database references | |
| SIMBAD | data |
| κ1 | |
| κ2 | |
Kappa Boötis is a double star in the constellation Boötes. Its name is a Bayer designation that is Latinized from κ Boötis, and abbreviated Kappa Boo or κ Boo. This star has the traditional name Asellus Tertius, which is pronouced /əˈsɛləs ˈtɜːrʃiəs/ and is Latin for "third donkey colt". The components have an angular separation of 13.5 arcsec; viewable in a small telescope. Kappa Boötis is approximately 162 light-years (50 pc) from Earth.