47 Tauri

47 Tauri
Observation data; Epoch J2000 Equinox J2000
Constellation	Taurus
Right ascension	04h 13m 56.38482s
Declination	+09° 15′ 49.7729″
Apparent magnitude (V)	4.89; (5.05 + 7.32)
Characteristics
Spectral type	G5III + A7V:
U−B color index	+0.46
B−V color index	+0.82
Astrometry
Radial velocity (Rv)	-8.2 ± 0.4 km/s
Proper motion (μ)	RA: -10.31 mas/yr ; Dec.: -30.01 mas/yr
Parallax (π)	9.83 ± 0.64 mas
Distance	330 ± 20 ly ; (102 ± 7 pc)
Orbit
Period (P)	479 yr
Semi-major axis (a)	1.053″
Eccentricity (e)	0.910
Inclination (i)	128.6°
Longitude of the node (Ω)	52.9°
Periastron epoch (T)	B 1816.6
Argument of periastron (ω); (secondary)	263.0°
Details
47 Tau A
Radius	12.9 R☉
Surface gravity (log g)	2.67 ± 0.11 cgs
Temperature	5117 ± 58 K
Metallicity [Fe/H]	-0.10 ± 0.08 dex
Other designations
	BD+08° 652, HD 26722, HIP 19740, HR 1311, SAO 111674
Database references
SIMBAD	47 Tau
	47 Tau A
	47 Tau B

47 Tauri (abbreviated to 47 Tau) is a binary star in the zodiac constellation of Taurus. Parallax measurements made by the Hipparcos spacecraft put it at a distance of about 330 light-years (102 parsecs) from Earth. The system has a combined apparent magnitude of about 4.89,^[2] meaning it can be faintly seen with the naked eye, according to the Bortle scale.

47 Tauri is a visual binary, meaning that the two components can be resolved, and the orbit is derived from the positions of the two stars. The primary component is a G-type giant. Its radius is about 13 times that of the Sun.^[7] The companion is likely a white-colored A-type main-sequence star that is fainter. The two stars are separated about 1.3 arcseconds away,^[2] and because of their large separation, the two stars take some 479 years to complete an orbit.^[3]

References

^ ^a ^b ^c ^d ^e van Leeuwen, F.; et al. (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 "* 47 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2 May 2017.
^ ^a ^b ^c "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 2 May 2017.
^ Stephenson, C. B.; Sanwal, N. B. (1969). "The masses of stars above the main sequence". The Astronomical Journal. 74: 689. Bibcode:1969AJ.....74..689S. doi:10.1086/110845.
^ ^a ^b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
^ ^a ^b ^c ^d Kang, Wonseok; Lee, Sang-Gak; Kim, Kang-Min (2011). "Abundances of Refractory Elements for G-Type Stars with Extrasolar Planets". The Astrophysical Journal. 736 (2): 87. arXiv:1105.3083. Bibcode:2011ApJ...736...87K. doi:10.1088/0004-637X/736/2/87. S2CID 118382154.
^ ^a ^b Pasinetti Fracassini, L. E.; et al. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy & Astrophysics. 367 (2): 521–24. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID 425754.

[HIP-1] van Leeuwen, F.; et al. (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.

[SIMBAD-2] "* 47 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2 May 2017.

[ORB6-3] "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 2 May 2017.

[4] Stephenson, C. B.; Sanwal, N. B. (1969). "The masses of stars above the main sequence". The Astronomical Journal. 74: 689. Bibcode:1969AJ.....74..689S. doi:10.1086/110845.

[EgUBV-5] Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.

[Kang-6] Kang, Wonseok; Lee, Sang-Gak; Kim, Kang-Min (2011). "Abundances of Refractory Elements for G-Type Stars with Extrasolar Planets". The Astrophysical Journal. 736 (2): 87. arXiv:1105.3083. Bibcode:2011ApJ...736...87K. doi:10.1088/0004-637X/736/2/87. S2CID 118382154.

[CADARS-7] Pasinetti Fracassini, L. E.; et al. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy & Astrophysics. 367 (2): 521–24. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID 425754.

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47 Tauri

References

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