Back Tau1 Eridani French Tau1 Eridani ID Tau1 Eridani Dutch Tau1 Eridani Portuguese Тау¹ Эридана Russian Tau1 Eridani Slovak Tau1 Eridani Swedish Tau1 Eridani Turkish 波江座τ Chinese

Tau1 Eridani

For other star systems with this Bayer designation, see Tau Eridani.
τ1 Eridani
Observation data
Epoch J2000      Equinox J2000
Constellation Eridanus
Right ascension 02h 45m 06.18710s[1]
Declination −18° 34′ 21.2149″[1]
Apparent magnitude (V) 4.46[2]
Characteristics
Spectral type F7V[3]
U−B color index +0.00[2]
B−V color index +0.48[2]
Astrometry
Radial velocity (Rv)+25.9[4] km/s
Proper motion (μ) RA: +334.20[1] mas/yr
Dec.: +37.19[1] mas/yr
Parallax (π)70.32±1.83 mas[1]
Distance46 ± 1 ly
(14.2 ± 0.4 pc)
Absolute magnitude (MV)+3.68[5]
Orbit[6]
Period (P)958 d
Eccentricity (e)0.45
Periastron epoch (T)39391.9
Argument of periastron (ω)
(secondary)		180°
Details
Mass1.15[7] M☉
Radius1.325[8] R☉
Luminosity2.572[8] L☉
Surface gravity (log g)4.34[9] cgs
Temperature6,357[8] K
Metallicity [Fe/H]−0.08 ± 0.06[9] dex
Rotation3.847 d[10]
Rotational velocity (v sin i)28.02[11] km/s
Other designations
1 Eri, BD−19°518, FK5 2075, GJ 111, HD 17206, HIP 12843, HR 818, SAO 11557[12]
Database references
SIMBADdata

Tau1 Eridani, Latinized from τ1 Eridani, is a binary star[6] system in the constellation Eridanus. It has an apparent magnitude of 4.46, making it visible to the naked eye in suitably dark conditions. This is a spectroscopic binary with an orbital period of 958 days.[6] It is located about 46 light years from the Earth.[1] At present, the system is moving away from the Sun with a radial velocity of +26 km/s.[4] About 305,000 years ago, perihelion passage was made at an estimated distance of 30.5 ly (9.35 pc).[13]

Tau1 Eridani was a latter designation of 90 Ceti.[14]

  1. ^ a b c d e f Cite error: The named reference aa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference MERMILLIOD was invoked but never defined (see the help page).
  3. ^ Abt, H. A. (2009). "MK Classifications of Spectroscopic Binaries". The Astrophysical Journal Supplement Series. 180 (1): 117–118. Bibcode:2009ApJS..180..117A. doi:10.1088/0067-0049/180/1/117. S2CID 122811461.
  4. ^ a b Cite error: The named reference paas21_2_129 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Reiners2006 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference pdaov15_121 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference aj144_1_7 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference schofield was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference aaa420_183 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference rot_rate was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference aaa520_A79 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics, 575: 13, arXiv:1412.3648, Bibcode:2015A&A...575A..35B, doi:10.1051/0004-6361/201425221, S2CID 59039482, A35.
  14. ^ Wagman, M. (August 1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy. 18 (3): 215. Bibcode:1987JHA....18..209W. doi:10.1177/002182868701800305. S2CID 118445625.
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