Tau Boötis
Star in the constellation of Boötes / From Wikipedia, the free encyclopedia
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Not to be confused with T Boötis.
Tau Boötis, Latinised from τ Boötis, is an F-type main-sequence star approximately 51 light-years away[1] in the constellation of Boötes. It is a binary star system, with the secondary star being a red dwarf. In 1999, an extrasolar planet was detected orbiting the primary star. In December 2020, astronomers may have observed, for the first time, radio emissions from a planet beyond the Solar System. According to the researchers: "The signal is from the Tau Boötis system, which contains a binary star and an exoplanet. We make the case for an emission by the planet itself."[8][9]
Quick Facts Observation data Epoch J2000.0 Equinox J2000.0, Constellation ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Boötes |
Right ascension | 13h 47m 15.7382s[1] |
Declination | +17° 27′ 24.810″[1] |
Apparent magnitude (V) | 4.50[2] (4.46 to 4.52)[3] |
Characteristics | |
Spectral type | F6V + M2[4] |
B−V color index | 0.48[2] |
Variable type | Suspected[3] |
Astrometry | |
Proper motion (μ) | RA: −468.923(95) mas/yr[1] Dec.: +63.469(74) mas/yr[1] |
Parallax (π) | 64.0470 ± 0.1093 mas[1] |
Distance | 50.92 ± 0.09 ly (15.61 ± 0.03 pc) |
Absolute magnitude (MV) | 3.38[5] |
Orbit[4] | |
Primary | τ Boo A |
Companion | τ Boo B |
Period (P) | 2,420+2,587 −947 yr |
Semi-major axis (a) | 14.1+8.8 −3.9″ |
Eccentricity (e) | 0.87±0.04 |
Inclination (i) | 47.2+2.7 −3.7° |
Longitude of the node (Ω) | 191.8+3.3 −4.7° |
Argument of periastron (ω) (secondary) | 290.7+13 −10° |
Details | |
τ Boo A | |
Mass | 1.35±0.03[4] M☉ |
Radius | 1.42±0.02[4] R☉ |
Luminosity | 3.06±0.16[6] L☉ |
Surface gravity (log g) | 4.26±0.06[4] cgs |
Temperature | 6,387±44[4] K |
Metallicity [Fe/H] | 0.25±0.03[4] dex |
Rotation | 3.2±0.2 days[4] |
Rotational velocity (v sin i) | 14.27±0.06[6] km/s |
Age | 1.3+0.4 −0.6[4] Gyr |
τ Boo B | |
Mass | 0.49±0.02[4] M☉ |
Radius | 0.48±0.05[4] R☉ |
Surface gravity (log g) | 4.90[7] cgs |
Temperature | 3,580±90[4] K |
Metallicity [Fe/H] | +0.21[7] dex |
Rotational velocity (v sin i) | 5.0[7] km/s |
Other designations | |
Database references | |
SIMBAD | data |
A | |
B |
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