| 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 | |
| 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]
- ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752, Bibcode: 2007A&A...474..653V, doi: 10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society, 133 (4): 475–493, Bibcode: 1966MNRAS.133..475A, doi: 10.1093/mnras/133.4.475.
- ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode: 1989ApJS...71..245K, doi: 10.1086/191373.
- ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv: 1208.3048, Bibcode: 2012A&A...546A..61D, doi: 10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ a b c d e f g Takeda, Yoichi; et al. (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan, 60 (4): 781–802, arXiv: 0805.2434, Bibcode: 2008PASJ...60..781T, doi: 10.1093/pasj/60.4.781.
- ^
a
b Lang, Kenneth R. (2006),
Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.),
Birkhäuser,
ISBN
3-540-29692-1. The radius (R*) is given by:
- ^ a b c McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv: 1208.2037, Bibcode: 2012MNRAS.427..343M, doi: 10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ "pi Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-30.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv: 0806.2878, Bibcode: 2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode: 2005A&A...431..773R, doi: 10.1051/0004-6361:20042039.
| 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 | |
| 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]
- ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752, Bibcode: 2007A&A...474..653V, doi: 10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society, 133 (4): 475–493, Bibcode: 1966MNRAS.133..475A, doi: 10.1093/mnras/133.4.475.
- ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode: 1989ApJS...71..245K, doi: 10.1086/191373.
- ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv: 1208.3048, Bibcode: 2012A&A...546A..61D, doi: 10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ a b c d e f g Takeda, Yoichi; et al. (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan, 60 (4): 781–802, arXiv: 0805.2434, Bibcode: 2008PASJ...60..781T, doi: 10.1093/pasj/60.4.781.
- ^
a
b Lang, Kenneth R. (2006),
Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.),
Birkhäuser,
ISBN
3-540-29692-1. The radius (R*) is given by:
- ^ a b c McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv: 1208.2037, Bibcode: 2012MNRAS.427..343M, doi: 10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ "pi Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-30.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv: 0806.2878, Bibcode: 2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode: 2005A&A...431..773R, doi: 10.1051/0004-6361:20042039.
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