Sigma Boötis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 34m 40.817s |
| Declination | +29° 44′ 42.48″ |
| Apparent magnitude (V) | 4.46 |
| Characteristics | |
| Spectral type | F4VkF2mF1 |
| U−B color index | −0.084 |
| B−V color index | +0.366 |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | +0.37±0.09 km/s |
| Proper motion (μ) | RA: +188.574 mas/yr Dec.: +131.580 mas/yr |
| Parallax (π) | 63.4679±0.1173 mas |
| Distance | 51.39 ± 0.09 ly (15.76 ± 0.03 pc) |
| Absolute magnitude (MV) | 3.52 |
| Details | |
| Mass | 1.48 M☉ 1.18 M☉ |
| Radius | 1.431±0.023 R☉ |
| Luminosity | 3.461±0.042 L☉ |
| Surface gravity (log g) | 4.30 cgs |
| Temperature | 6,594±55 K |
| Metallicity [Fe/H] | −0.24 dex |
| Rotational velocity (v sin i) | 7.32 km/s |
| Age | 1.7 Gyr 2.42 Gyr 3.1 Gyr |
| Other designations | |
| σ Boo, 28 Boötis, BD+30°2536, GC 19659, GJ 557, HD 128167, HIP 71284, HR 5447, SAO 83416, PPM 103421, CCDM 14347+2945, WDS J14347+2945A | |
| Database references | |
| SIMBAD | data |
Sigma Boötis is a single, yellow-hued star in the northern constellation of Boötes. Its name is a Bayer designation that is Latinized from σ Boötis, and abbreviated Sigma Boo or σ Boo. This star is visible to the naked eye with an apparent visual magnitude of 4.46. Located to the southeast of Rho Boötis, the dwarf Sigma may at first appear as a naked-eye double, but the angular proximity with Rho is merely line-of-sight. Sigma Boötis is located at a distance of 51.4 light-years (16 pc) from the Sun based on parallax. The star has a relatively high proper motion and is traversing the sky at the rate of 0.230″ yr−1.