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Location of δ Boötis, left of center |
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | Boötes |
| Right ascension | 15h 15m 30.163s |
| Declination | +33° 18′ 53.401″ |
| Apparent magnitude (V) | 3.47 |
| Characteristics | |
| Spectral type | G8IIIFe-1 |
| U−B color index | 0.66 |
| B−V color index | 0.95 |
| R−I color index | 0.51 |
| Variable type | Variable star |
| Astrometry | |
| Radial velocity (Rv) | -12.3 km/s |
| Proper motion (μ) | RA: 84.84 mas/yr Dec.: -110.57 mas/yr |
| Parallax (π) | 27.94 ± 0.61 mas |
| Distance | 117 ± 3 ly (35.8 ± 0.8 pc) |
| Absolute magnitude (MV) | 4.42 |
| Details | |
| Mass | 1.1 M☉ |
| Radius | 1.1 R☉ |
| Luminosity | 1.2 L☉ |
| Temperature | 5,000–6,000 K |
| Rotation | < 19 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
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| Database references | |
| SIMBAD | data |
Delta Boötis (δ Boo, δ Boötis) is a binary star in the constellation Boötes. It is approximately 117 light years from Earth. The primary component is a yellow G-type giant with an apparent magnitude of +3.46. Its companion is a yellow G-type main sequence dwarf with an apparent magnitude of +8.7.
Sometimes, this star is called by the name Princeps, meaning prince or prime in Latin[1].
In Chinese, 七公 (Qī Gōng), meaning Seven Excellencies, refers to an asterism consisting of δ Boötis, 42 Herculis, τ Herculis, φ Herculis, χ Herculis, ν1 Boötis and μ1 Boötis.[2] Consequently, δ Boötis itself is known as 七公七 (Qī Gōng qī, English: the Seventh Star of Seven Excellencies.)[3]
About 3800 AU apart, the two take about 120,000 years to orbit each other.
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