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Star in the constellation Boötes From Wikipedia, the free encyclopedia
39 Boötis is a triple star[3] system located around 224[1] light years away from the Sun in the northern constellation of Boötes.[10] It is visible to the naked eye as a faint, yellow-white hued star with a combined apparent magnitude of 5.68.[2] The system is moving closer to the Earth with a heliocentric radial velocity of −31 km/s.[5]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 14h 49m 41.29265s[1] |
Declination | +48° 43′ 14.9077″[1] |
Apparent magnitude (V) | 5.68[2] (6.36 + 6.72)[3] |
Characteristics | |
Spectral type | F8V + F7V[4] |
Astrometry | |
Radial velocity (Rv) | −30.9±0.3[5] km/s |
Proper motion (μ) | RA: −77.94[1] mas/yr Dec.: 100.83[1] mas/yr |
Parallax (π) | 14.58 ± 0.51 mas[1] |
Distance | 224 ± 8 ly (69 ± 2 pc) |
Absolute magnitude (MV) | 2.53[6] |
Orbit[7] | |
Period (P) | 12.822 d |
Eccentricity (e) | 0.39 |
Periastron epoch (T) | 2,422,379.49 JD |
Argument of periastron (ω) (secondary) | 97.1° |
Semi-amplitude (K1) (primary) | 58.3 km/s |
Semi-amplitude (K2) (secondary) | 72.2 km/s |
Details | |
39 Boo A | |
Mass | 1.29/1.05[8] M☉ |
Metallicity [Fe/H] | 0.06[9] dex |
Rotational velocity (v sin i) | 161.0[6] km/s |
Age | 1.30[9] Gyr |
39 Boo B | |
Mass | 1.25[8] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
The magnitude 6.36[3] primary, component A, is actually a double-lined spectroscopic binary system with an orbital period of 12.822 days, an eccentricity of 0.39,[7] and an angular separation of 2.021 mas. It has a combined stellar classification of F8V,[4] matching an F-type main-sequence star, with individual massed of 1.29 and 1.05[8] times the mass of the Sun. Component B is of magnitude 6.72[3] with a class of F7V[4] and 1.25[8] solar masses. The A–B pair have a separation of 2.9″ and a period of 1,347.653 years.[8] This system is a source of X-ray emission with a luminosity of 41.4×1028 erg s−1.[11]
It was a transferred by Jérôme Lalande from Boötes to Quadrans Muralis.[12] Later when the International Astronomical Union officially recognised constellations, Quadrans Muralis became obsolete, so this star was moved back to Boötes.
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