Tau6 Eridani

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τ6 Eridani
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Eridanus
Right ascension 03h 46m 50.88819s[1]
Declination −23° 14′ 59.0046″[1]
Apparent magnitude (V) 4.22[2]
Spectral type F5IV-V[3]
U−B color index −0.03[2]
B−V color index +0.43[2]
Radial velocity (Rv) 8.0±0.8[4] km/s
Proper motion (μ) RA: −158.84[1] mas/yr
Dec.: −528.95[1] mas/yr
Parallax (π) 56.73 ± 0.19[1] mas
Distance 57.5 ± 0.2 ly
(17.63 ± 0.06 pc)
Absolute magnitude (MV) 2.98[5]
Mass 1.35[4] M
Radius 1.6[6] R
Surface gravity (log g) 4.21±0.13[4] cgs
Temperature 6,508±82[4] K
Metallicity [Fe/H] −0.03±0.11[4] dex
Rotational velocity (v sin i) 16.25[7] km/s
Age 2.0[4] Gyr
Other designations
τ6 Eridani, τ6 Eri, 27 Eridani, CD−23° 1565, FK5 140, GJ 155, HD 23754, HIP 17651, HR 1173, SAO 168827.[8]
Database references

Tau6 Eridani (τ6 Eri) is a star in the constellation Eridanus. It has an apparent visual magnitude of 4.22,[2] which is bright enough to be seen with the naked eye. Based upon parallax measurements, the distance to this star is around 57.5 light years.[1]

The spectrum of Tau6 Eridani matches a stellar classification of F5IV-V,[3] indicating it is an F-type star that shows traits of both a main sequence star and a subgiant. It has an estimated 135%[4] of the Sun's mass and about 1.6 time the radius of the Sun.[6] The effective temperature of the outer atmosphere is 6,508 K[4] and it does not display any surface magnetic activity.[7] The star has been examined for infrared excess emission that could indicate the presence of circumstellar matter, but none has been detected.[9]


  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Mermilliod, J.-C. (1986), Compilation of Eggen's UBV data, transformed to UBV (unpublished), SIMBAD, Bibcode:1986EgUBV........0M. 
  3. ^ a b Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770Freely accessible, doi:10.1086/504637. 
  4. ^ a b c d e f g h Kordopatis, G.; Gilmore, G.; Steinmetz, M.; Boeche, C.; Seabroke, G. M.; Siebert, A.; Zwitter, T.; Binney, J.; et al. (November 2013), "The Radial Velocity Experiment (RAVE): Fourth Data Release", The Astronomical Journal, 146 (5): 36, Bibcode:2013AJ....146..134K, arXiv:1309.4284Freely accessible, doi:10.1088/0004-6256/146/5/134, 134. 
  5. ^ Reiners, A. (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics, 446 (1): 267–277, Bibcode:2006A&A...446..267R, arXiv:astro-ph/0509399Freely accessible, doi:10.1051/0004-6361:20053911. 
  6. ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics, 367 (2): 521–524, Bibcode:2001A&A...367..521P, arXiv:astro-ph/0012289Freely accessible, doi:10.1051/0004-6361:20000451. 
  7. ^ a b Martínez-Arnáiz, R.; et al. (September 2010), "Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter", Astronomy and Astrophysics, 520: A79, Bibcode:2010A&A...520A..79M, arXiv:1002.4391Freely accessible, doi:10.1051/0004-6361/200913725. 
  8. ^ "* tau06 Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-10-13. 
  9. ^ Weinberger, Alycia J.; Bryden, Geoff; Kennedy, Grant M.; Roberge, Aki; Defrère, Denis; Hinz, Philip M.; Millan-Gabet, Rafael; Rieke, George; et al. (February 2015), "Target Selection for the LBTI Exozodi Key Science Program", The Astrophysical Journal Supplement Series, 216 (2): 8, Bibcode:2015ApJS..216...24W, arXiv:1501.01319Freely accessible, doi:10.1088/0067-0049/216/2/24, 24.