Lambda Sagittarii
Lambda Sagittarii (Latinized from λ Sagittarii), formally named Kaus Borealis /ˈkɔːs bɒriˈælɪs/, is a star in the southern constellation of Sagittarius. The star marks the top of the Archer's bow.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 27m 58.24072s |
| Declination | −25° 25′ 18.1146″ |
| Apparent magnitude (V) | +2.82 |
| Characteristics | |
| Spectral type | K0 IV |
| U−B color index | +0.903 |
| B−V color index | +1.045 |
| Astrometry | |
| Radial velocity (Rv) | −43.5 km/s |
| Proper motion (μ) | RA: −44.76 mas/yr Dec.: −185.66 mas/yr |
| Parallax (π) | 41.72 ± 0.16 mas |
| Distance | 78.2 ± 0.3 ly (23.97 ± 0.09 pc) |
| Absolute magnitude (MV) | 1.07±0.008 |
| Details | |
| Mass | 2.6 M☉ |
| Radius | 11.234±0.181 R☉ |
| Luminosity | 58.79±2.61 L☉ |
| Surface gravity (log g) | 2.66±0.10 cgs |
| Temperature | 4,768±36 K |
| Metallicity [Fe/H] | −0.11±0.03 dex |
| Rotational velocity (v sin i) | 3.81 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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