71 Tauri
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 26m 20.77082s |
| Declination | +15° 37′ 05.8841″ |
| Apparent magnitude (V) | +4.48 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | F0 V |
| U−B color index | +0.13 |
| B−V color index | +0.25 |
| Variable type | δ Sct |
| Astrometry | |
| Radial velocity (Rv) | +38.3 km/s |
| Proper motion (μ) | RA: +87.435 mas/yr Dec.: −20.978 mas/yr |
| Parallax (π) | 21.3957±0.2511 mas |
| Distance | 152 ± 2 ly (46.7 ± 0.5 pc) |
| Absolute magnitude (MV) | 1.10 |
| Details | |
| Mass | 1.94 M☉ |
| Radius | 3.34 R☉ |
| Surface gravity (log g) | 3.73 cgs |
| Temperature | 7,543 K |
| Rotation | 14.2 d |
| Rotational velocity (v sin i) | 192 km/s |
| Age | 966 Myr |
| Other designations | |
| 71 Tau, V777 Tau, BD+15°625, GC 5375, HD 28052, HIP 20713, HR 1394, SAO 93932 | |
| Database references | |
| SIMBAD | data |
71 Tauri is a suspected triple star system in the zodiac constellation Taurus, located 152 light years from the Sun. It is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of +4.48. The star is moving further away from the Earth with a heliocentric radial velocity of +38 km/s. It is a member of the Hyades open cluster.
The primary component is an F-type main-sequence star with a stellar classification of F0 V. In 1979, Stephen Horan discovered that 71 Tauri is a variable star. It was given its variable star designation, V777 Tauri, in 1981. It is a Delta Scuti variable with an amplitude of 0.02 in magnitude and a frequency of 0.16 d−1. This star has about 1.94 times the mass of the Sun and 3.34 times the Sun's radius. It has a projected rotational velocity of 192 km s−1, for an estimated rotation period of 14.2 days. Extreme ultraviolet flares have been observed coming from this star's hot corona, and it is the second brightest X-ray source in the Hyades.