Delta Boötis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| A | |
| Right ascension | 15h 15m 30.16282s |
| Declination | +33° 18′ 53.3925″ |
| Apparent magnitude (V) | 3.482 |
| B | |
| Right ascension | 15h 15m 38.34898s |
| Declination | +33° 19′ 15.3187″ |
| Apparent magnitude (V) | 7.81 |
| Characteristics | |
| A | |
| Spectral type | G8 III |
| U−B color index | +0.656 |
| B−V color index | +0.951 |
| B | |
| Spectral type | G0 V |
| U−B color index | +0.02 |
| B−V color index | +0.59 |
| Astrometry | |
| A | |
| Radial velocity (Rv) | −12.29±0.16 km/s |
| Proper motion (μ) | RA: +84.383 mas/yr Dec.: −111.591 mas/yr |
| Parallax (π) | 27.0746±0.1256 mas |
| Distance | 120.5 ± 0.6 ly (36.9 ± 0.2 pc) |
| Absolute magnitude (MV) | +0.700 |
| B | |
| Radial velocity (Rv) | −11.83±0.18 km/s |
| Proper motion (μ) | RA: +82.918 mas/yr Dec.: −110.075 mas/yr |
| Parallax (π) | 27.1573 ± 0.0178 mas |
| Distance | 120.10 ± 0.08 ly (36.82 ± 0.02 pc) |
| Absolute magnitude (MV) | +4.96 |
| Details | |
| A | |
| Mass | 1.5 M☉ |
| Radius | 11.43±0.07 R☉ |
| Luminosity | 58.1 L☉ |
| Surface gravity (log g) | 2.38±0.09 cgs |
| Temperature | 4,810±30 K |
| Metallicity [Fe/H] | −0.35±0.03 dex |
| Rotational velocity (v sin i) | 3.6 km/s |
| B | |
| Mass | 0.98 M☉ |
| Radius | 0.91±0.02 R☉ |
| Luminosity | 0.87 L☉ |
| Temperature | 5,812±67 K |
| Age | 3.09 Gyr |
| Other designations | |
| STF 4027, ADS 9559, WDS 15155+3319 | |
| A: δ Boo, 49 Boötis, BD+33 2561, FK5 563, HD 135722, HIP 74666, HR 5681, SAO 64589 | |
| B: BD+33 2562, HIP 74674, SAO 64591 | |
| Database references | |
| SIMBAD | A |
| B | |
Delta Boötis is a double star in the northern constellation of Boötes, forming the easternmost member of the constellation's kite-shaped asterism of brighter stars. Its name is a Bayer designation that is Latinized from δ Boötis, and abbreviated Delta Boo or δ Boo. Based upon parallax measurements, it is located at a distance of approximately 120.5 light-years (36.9 parsecs) from the Earth. The apparent visual magnitude of this star is 3.5, making it visible to the naked eye even during a Full Moon. The magnitude 7.81 companion can be viewed in binoculars or a small telescope.