Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Taurus |
Right ascension | 04h 13m 56.38482s [1] |
Declination | +09° 15′ 49.7729″ [1] |
Apparent magnitude (V) | 4.89
[2] (5.05 + 7.32) [3] |
Characteristics | |
Spectral type | G5III + A7V: [4] |
U−B color index | +0.46 [5] |
B−V color index | +0.82 [5] |
Astrometry | |
Radial velocity (Rv) | -8.2 ± 0.4 [6] km/s |
Proper motion (μ) |
RA: -10.31
[1]
mas/
yr Dec.: -30.01 [1] mas/ yr |
Parallax (π) | 9.83 ± 0.64 mas [1] |
Distance | 330 ± 20
ly (102 ± 7 pc) |
Orbit [3] | |
Period (P) | 479 yr |
Semi-major axis (a) | 1.053″ |
Eccentricity (e) | 0.910 |
Inclination (i) | 128.6° |
Longitude of the node (Ω) | 52.9° |
Periastron epoch (T) | B 1816.6 |
Argument of periastron (ω) (secondary) | 263.0° |
Details | |
47 Tau A | |
Radius | 12.9 [7] R☉ |
Surface gravity (log g) | 2.67 ± 0.11 [6] cgs |
Temperature | 5117 ± 58 [6] K |
Metallicity [Fe/H] | -0.10 ± 0.08 [6] dex |
Other designations | |
Database references | |
SIMBAD | 47 Tau |
47 Tau A | |
47 Tau B |
47 Tauri (abbreviated to 47 Tau) is a binary star in the zodiac constellation of Taurus. Parallax measurements made by the Hipparcos spacecraft put it at a distance of about 330 light-years (102 parsecs) from Earth. The system has a combined apparent magnitude of about 4.89, [2] meaning it can be faintly seen with the naked eye, according to the Bortle scale.
47 Tauri is a visual binary, meaning that the two components can be resolved, and the orbit is derived from the positions of the two stars. The primary component is a G-type giant. Its radius is about 13 times that of the Sun. [7] The companion is likely a white-colored A-type main-sequence star that is fainter. The two stars are separated about 1.3 arcseconds away, [2] and because of their large separation, the two stars take some 479 years to complete an orbit. [3]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Taurus |
Right ascension | 04h 13m 56.38482s [1] |
Declination | +09° 15′ 49.7729″ [1] |
Apparent magnitude (V) | 4.89
[2] (5.05 + 7.32) [3] |
Characteristics | |
Spectral type | G5III + A7V: [4] |
U−B color index | +0.46 [5] |
B−V color index | +0.82 [5] |
Astrometry | |
Radial velocity (Rv) | -8.2 ± 0.4 [6] km/s |
Proper motion (μ) |
RA: -10.31
[1]
mas/
yr Dec.: -30.01 [1] mas/ yr |
Parallax (π) | 9.83 ± 0.64 mas [1] |
Distance | 330 ± 20
ly (102 ± 7 pc) |
Orbit [3] | |
Period (P) | 479 yr |
Semi-major axis (a) | 1.053″ |
Eccentricity (e) | 0.910 |
Inclination (i) | 128.6° |
Longitude of the node (Ω) | 52.9° |
Periastron epoch (T) | B 1816.6 |
Argument of periastron (ω) (secondary) | 263.0° |
Details | |
47 Tau A | |
Radius | 12.9 [7] R☉ |
Surface gravity (log g) | 2.67 ± 0.11 [6] cgs |
Temperature | 5117 ± 58 [6] K |
Metallicity [Fe/H] | -0.10 ± 0.08 [6] dex |
Other designations | |
Database references | |
SIMBAD | 47 Tau |
47 Tau A | |
47 Tau B |
47 Tauri (abbreviated to 47 Tau) is a binary star in the zodiac constellation of Taurus. Parallax measurements made by the Hipparcos spacecraft put it at a distance of about 330 light-years (102 parsecs) from Earth. The system has a combined apparent magnitude of about 4.89, [2] meaning it can be faintly seen with the naked eye, according to the Bortle scale.
47 Tauri is a visual binary, meaning that the two components can be resolved, and the orbit is derived from the positions of the two stars. The primary component is a G-type giant. Its radius is about 13 times that of the Sun. [7] The companion is likely a white-colored A-type main-sequence star that is fainter. The two stars are separated about 1.3 arcseconds away, [2] and because of their large separation, the two stars take some 479 years to complete an orbit. [3]