Pi Tauri
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (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−B color index | +0.72[2] |
| B−V color 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-hued star in the zodiac constellation of Taurus. With an apparent 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 the Hyades 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 annual parallax 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 an extinction factor of 0.24 due to interstellar dust.[5]
This is an evolved G-type giant star with a stellar classification of G7 IIIa Fe-1,[3] where the suffix notation indicates an underabundance of iron in the spectrum. The measured angular diameter is 1.55±0.06 mas.[10] At the estimated distance of Pi Tauri, this yields a physical size of about 21 times the radius of the Sun.[6] It possesses nearly four[5] times the mass of the Sun and is radiating 229 times the Sun's luminosity at an effective temperature of 5,086 K.[7]
References
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