| Observation data EpochJ2000.0 EquinoxJ2000.0 (ICRS) | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 26m 36.37093s[1] |
| Declination | +14° 42′ 49.6126″[1] |
| Apparent magnitude (V) | +4.69[2] |
| Characteristics | |
| Spectral type | G7 IIIa Fe-1[3] |
| U−Bcolor index | +0.72[2] |
| B−Vcolor index | +0.98[2] |
| Astrometry | |
| Radial velocity (Rv) | +31.4±0.3[4] km/s |
| Proper motion (μ) | RA: −9.52[1]mas/yr Dec.: −31.44[1]mas/yr |
| Parallax (π) | 7.83±0.22 mas[1] |
| Distance | 420 ± 10 ly (128 ± 4 pc) |
| Absolute magnitude (MV) | −1.27[5] |
| Details | |
| Mass | 3.94[5] M☉ |
| Radius | 21[6] R☉ |
| Luminosity | 229[7] L☉ |
| Surface gravity (log g) | 2.54[5] cgs |
| Temperature | 5,086[7] K |
| Metallicity [Fe/H] | −0.08[5] dex |
| Age | 17[5] Myr |
| Other designations | |
| π Tau,73 Tau,BD+14° 697,HD 28100,HIP 20732,HR 1396,SAO 93935[8] | |
| Database references | |
| SIMBAD | data |
Pi Tauri (π Tauri) is a solitary,[9] yellow-huedstar in thezodiacconstellation ofTaurus. With anapparent visual magnitude of +4.69,[2] it is bright enough to be visible to the naked eye. Although it appears to lie among the stars of theHyades cluster, it is not itself a member, being three times farther from Earth than the cluster. The distance to this star, as determined using an annualparallax shift of 7.83 mas as seen from the Earth,[1] is around 420 light years. At that range, the visual magnitude of the star is diminished by anextinction factor of 0.24 due tointerstellar dust.[5]
This is anevolvedG-typegiant star with astellar classification ofG7 IIIa Fe-1,[3] where the suffix notation indicates an underabundance of iron in thespectrum. The measuredangular diameter is1.55±0.06 mas.[10] At the estimated distance of Pi Tauri, this yields a physical size of about 21 times theradius of the Sun.[6] It possesses nearly four[5] times themass of the Sun and is radiating 229 times theSun's luminosity at aneffective temperature of 5,086 K.[7]
