Rho Tucanae

Rho Tucanae (ρ Tuc, ρ Tucanae) is a binary star system in the southern constellation of Tucana. It is visible to the naked eye with a combined apparent visual magnitude of +5.38.[2] Based upon an annual parallax shift of 24.37 mas as seen from Earth, it is located 131 light years from the Sun.

Rho Tucanae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Tucana
Right ascension  00h 42m 28.37166s[1]
Declination −65° 28′ 04.9100″[1]
Apparent magnitude (V) +5.38[2]
Characteristics
Spectral type F6 V[3]
U−B color index +0.00[2]
B−V color index +0.50[2]
Astrometry
Radial velocity (Rv)33.962±0.796[4] km/s
Proper motion (μ) RA: +53.07[1] mas/yr
Dec.: +40.94[1] mas/yr
Parallax (π)24.37 ± 0.27[1] mas
Distance134 ± 1 ly
(41.0 ± 0.5 pc)
Absolute magnitude (MV)+2.75[5]
Orbit[6]
Period (P)4.8202 d
Eccentricity (e)0.02
Periastron epoch (T)2419299.11 JD
Semi-amplitude (K1)
(primary)		26.1 km/s
Details
ρ Tuc A
Mass1.66[7] M☉
Luminosity9.7[8] L☉
Surface gravity (log g)3.64±0.11[4] cgs
Temperature6,034±54[4] K
Metallicity [Fe/H]−0.26[4] dex
Rotational velocity (v sin i)23.5±1.2[5] km/s
Age2.64[3] Gyr
ρ Tuc B
Mass0.33[7] M☉
Other designations
ρ Tuc, CP−66° 47, FK5 2047, HD 4089, HIP 3330, HR 187, SAO 248237[9]
Database references
SIMBADdata

This is a single-lined spectroscopic binary with a close, nearly circular orbit having a period of 4.82 days and an eccentricity of 0.02.[6] The primary member, component A, is a yellow-white hued F-type main sequence star with a stellar classification of F6 V.[3] It is around 2.6 billion years old and a member of the thin disk population.[3] The primary has about 1.66 times the mass of the Sun while the secondary is just 0.33 times the Sun's mass.[7]

References
  1. 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.
  2. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
  3. Ibukiyama, A.; Arimoto, N. (November 2002), "HIPPARCOS age-metallicity relation of the solar neighbourhood disc stars", Astronomy and Astrophysics, 394: 927–941, arXiv:astro-ph/0207108, Bibcode:2002A&A...394..927I, doi:10.1051/0004-6361:20021157.
  4. Kunder, Andrea; et al. (February 2017), "The Radial Velocity Experiment (RAVE): Fifth Data Release", The Astronomical Journal, 153 (2): 30, arXiv:1609.03210, Bibcode:2017AJ....153...75K, doi:10.3847/1538-3881/153/2/75, 75.CS1 maint: multiple names: authors list (link)
  5. Reiners, A. (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics, 446 (1): 267–277, arXiv:astro-ph/0509399, Bibcode:2006A&A...446..267R, doi:10.1051/0004-6361:20053911.
  6. Pourbaix, D.; et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy and Astrophysics, 424 (2): 727, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213.
  7. Tokovinin, Andrei (April 2014), "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs", The Astronomical Journal, 147 (4): 14, arXiv:1401.6827, Bibcode:2014AJ....147...87T, doi:10.1088/0004-6256/147/4/87, 87.
  8. 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.
  9. "rho Tuc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-04-18.
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