3 Boötis
Star in the constellation Boötes
From Wikipedia, the free encyclopedia
3 Boötis is a close binary star system in the northern constellation of Boötes,[6] located 310 light years away from the Sun based upon parallax.[2] It can be viewed with the naked eye in excellent seeing conditions as a dim star with an apparent visual magnitude of 5.97.[1] The system is moving further from the Earth with a heliocentric radial velocity of 12 km/s.[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes[1] |
| Right ascension | 13h 46m 43.32359s[2] |
| Declination | +25° 42′ 08.0548″[2] |
| Apparent magnitude (V) | 5.97[1] |
| Characteristics | |
| Evolutionary stage | HG + MS[3] |
| Spectral type | kA9hF6mF6[4] (A7 V: + G5 III:[5] or F2p + G0 IV[3]) |
| B−V color index | 0.523±0.004[1] |
| Astrometry | |
| Radial velocity (Rv) | 11.9±0.9[1] km/s |
| Proper motion (μ) | RA: −18.564[2] mas/yr Dec.: −59.093[2] mas/yr |
| Parallax (π) | 10.5064±0.0425 mas[2] |
| Distance | 310 ± 1 ly (95.2 ± 0.4 pc) |
| Absolute magnitude (MV) | 1.21[1] |
| Orbit[3] | |
| Period (P) | 36.006 d |
| Eccentricity (e) | 0.543±0.002 |
| Inclination (i) | 74.5±2.0° |
| Semi-amplitude (K1) (primary) | 52.30±0.19 km/s |
| Semi-amplitude (K2) (secondary) | 59.0±0.6 km/s |
| Details | |
| 3 Boo A | |
| Mass | 1.8[3] M☉ |
| Radius | 3.7[3] R☉ |
| Temperature | 5,848[3] K |
| 3 Boo A | |
| Mass | 1.6[3] M☉ |
| Radius | 2.6[3] R☉ |
| Temperature | 6,745[3] K |
| Age | 1.5[3] Gyr |
| Other designations | |
| 3 Boo, BD+26°2494, FK5 1358, HD 120064, HIP 67239, HR 5182, SAO 82993[6] | |
| Database references | |
| SIMBAD | data |
This is a double-lined spectroscopic binary system with an orbital period of 36 days and an eccentricity of 0.543. The orbital plane is inclined 74.5° and the system does not form an eclipsing binary. The primary component is an evolving star currently in the Hertzsprung gap. Its companion is a main sequence star. Both members have more mass than the Sun and they are around 1.5 billion years old.[3]