Pi Tauri

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]
Distance420 ± 10 ly
(128 ± 4 pc)
Absolute magnitude (MV)−1.27[5]
Details
Mass3.94[5] M☉
Radius21[6] R☉
Luminosity229[7] L☉
Surface gravity (log g)2.54[5] cgs
Temperature5,086[7] K
Metallicity [Fe/H]−0.08[5] dex
Age17[5] Myr
Other designations
π Tau, 73 Tau, BD+14° 697, HD 28100, HIP 20732, HR 1396, SAO 93935[8]
Database references
SIMBADdata

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]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Argue1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Keenan1989 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ a b c d e f g Cite error: The named reference Takeda2008 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference lang2006 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Richichi2005 was invoked but never defined (see the help page).