Zeta Boötis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| ζ Boo | |
| Right ascension | 14h 41m 08.95158s |
| Declination | +13° 43′ 41.8967″ |
| Apparent magnitude (V) | 3.78 (4.46 + 4.55) |
| HIP 71759 | |
| Right ascension | 14h 40m 42.39288s |
| Declination | +13° 32′ 03.5621″ |
| Apparent magnitude (V) | 5.925 |
| Characteristics | |
| ζ Boo | |
| Spectral type | A1V |
| U−B color index | +0.05 |
| B−V color index | +0.05 |
| HIP 71759 | |
| Spectral type | F0V |
| B−V color index | 0.227 |
| Variable type | δ Scuti |
| Astrometry | |
| ζ Boo | |
| Radial velocity (Rv) | −8.5±0.6 km/s |
| Proper motion (μ) | RA: +51.95 mas/yr Dec.: −11.08 mas/yr |
| Parallax (π) | 18.56±0.76 mas |
| Distance | 176 ± 7 ly (54 ± 2 pc) |
| Absolute magnitude (MV) | +0.13 |
| HIP 71759 | |
| Proper motion (μ) | RA: +54.399 mas/yr Dec.: −15.481 mas/yr |
| Parallax (π) | 19.3257 ± 0.0511 mas |
| Distance | 168.8 ± 0.4 ly (51.7 ± 0.1 pc) |
| Absolute magnitude (MV) | 2.37 |
| Orbit | |
| Primary | ζ Boo A |
| Companion | ζ Boo B |
| Period (P) | 125.04+0.24 −0.21 years |
| Semi-major axis (a) | 41.84+0.46 −0.44 au |
| Eccentricity (e) | 0.98045 |
| Inclination (i) | 125.88±0.16° |
| Longitude of the node (Ω) | 176.63±0.16° |
| Periastron epoch (T) | 2023.9548 |
| Argument of periastron (ω) (secondary) | 62.08+0.13 −0.14° |
| Details | |
| ζ Boo A | |
| Mass | 2.21+0.14 −0.05 M☉ |
| Radius | 2.6+0.3 −0.4 R☉ |
| Temperature | 8,800+1,000 −600 K |
| Age | 560+150 −240 Myr |
| ζ Boo B | |
| Mass | 2.15+0.10 −0.03 M☉ |
| Radius | 2.4±0.3 R☉ |
| Temperature | 8,750+800 −550 K |
| Age | 560+150 −240 Myr |
| HIP 71759 | |
| Mass | 1.79±0.29 M☉ |
| Radius | 1.70±0.05 R☉ |
| Luminosity | 9.01±0.22 L☉ |
| Surface gravity (log g) | 4.23±0.08 cgs |
| Temperature | 7,660±107 K |
| Other designations | |
| ζ Boo, 30 Boötis, BD+14°2770, GC 19777, HIP 71795, SAO 101145, ADS 9343, CCDM 14411+1344, WDS J14411+1344 | |
| A: HD 129247, HR 5478 | |
| B: HD 129246, HR 5477 | |
| HIP 71759: BD+14 2769, HD 129153, HR 5473, SAO 101137, TIC 119613557, TYC 917-1472-1 | |
| Database references | |
| SIMBAD | data |
| HIP 71759 | |
| SIMBAD | data |
Zeta Boötis is a binary star system in the constellation of Boötes that forms a triple star system with HIP 71759. Its name is a Bayer designation that is Latinized from ζ Boötis, and abbreviated Zeta Boo or ζ Boo. They have the Flamsteed designation 30 Boötis. This system is visible to the naked eye as a point of light with an apparent visual magnitude of +3.78. The individual magnitudes of the components differ slightly, with component A having a magnitude of 4.46 and component B at the slightly dimmer magnitude 4.55. The system is located at a distance of approximately 180 light years based on parallax, but is drifting closer to the Sun with a radial velocity of −9 km/s.