| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 02 45 06.18710 |
| Declination | −18° 34′ 21.2149″ |
| Apparent magnitude (V) | 4.46 |
| Characteristics | |
| Spectral type | F7V |
| U−B color index | +0.00 |
| B−V color index | +0.48 |
| Astrometry | |
| Radial velocity (Rv) | +25.9 km/s |
| Proper motion (μ) | RA: +334.20 mas/yr Dec.: +37.19 mas/yr |
| Parallax (π) | 70.32 ± 1.83 mas |
| Distance | 46 ± 1 ly (14.2 ± 0.4 pc) |
| Absolute magnitude (MV) | +3.68 |
| Orbit | |
| Period (P) | 958 d |
| Eccentricity (e) | 0.45 |
| Periastron epoch (T) | 39391.9 |
| Argument of periastron (ω) (secondary) | 180° |
| Details | |
| Mass | 1.15 M☉ |
| Radius | 1.325 R☉ |
| Luminosity | 2.572 L☉ |
| Surface gravity (log g) | 4.34 cgs |
| Temperature | 6,357 K |
| Metallicity | −0.08 ± 0.06 dex |
| Rotation | 3.847 d |
| Rotational velocity (v sin i) | 28.02 km/s |
| Other designations | |
| 1 Eri, BD−19°518, FK5 2075, GJ 111, HD 17206, HIP 12843, HR 818, SAO 11557 | |
| Database references | |
| SIMBAD | data |
Tau Eridani, Latinized from τ Eridani, is a binary star 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. It is located about 46 light years from the Earth. At present, the system is moving away from the Sun with a radial velocity of +26 km/s. About 305,000 years ago, perihelion passage was made at an estimated distance of 30.5 ly (9.35 pc).
Tau Eridani was a latter designation of 90 Ceti.
Debris disk
A moderate far-infrared excess was observed for this star system, in the 12μm, 25μm, 60μm and 100μm wavelengths, by the Infrared Astronomical Satellite (IRAS), and published in 1993. This discovery was subsequently interpreted as indicating a debris disk with a radius near 500 AU. It was further speculated that, if the star system had been observed at longer wavelengths, it was likely the debris disk would have been seen to have a radius considerably wider than 500 AU.
Later observations made by the Spitzer Space Telescope, published in 2004, detected no substantial infrared excess around the stars, within the 14-35μm range of wavelengths.
References
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- ^ Nordström, B.; et al. (2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ~14000 F and G dwarfs", Publications of the Astronomical Society of Australia, 21 (2): 129–133, Bibcode:2004PASA...21..129N, doi:10.1071/AS04013.
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- ^ Batten, A. H.; et al. (1978), "Seventh catalogue of the orbital elements of spectroscopic binary systems", Publications of the Dominion Astrophysical Observatory Victoria, 15: 121–295, 150–151, Bibcode:1978PDAO...15..121B.
- Tokovinin, Andrei; et al. (July 2012), "Revealing Companions to Nearby Stars with Astrometric Acceleration", The Astronomical Journal, 144 (1): 10, arXiv:1204.4206, Bibcode:2012AJ....144....7T, doi:10.1088/0004-6256/144/1/7, S2CID 30955275, 7.
- ^ Schofield, Mathew; Chaplin, William J.; Huber, Daniel; Campante, Tiago L.; Davies, Guy R.; Miglio, Andrea; Ball, Warrick H.; Appourchaux, Thierry; Basu, Sarbani; Bedding, Timothy R.; Christensen-Dalsgaard, Jørgen; Creevey, Orlagh; García, Rafael A.; Handberg, Rasmus; Kawaler, Steven D. (2019-03-01), "The Asteroseismic Target List for Solar-like Oscillators Observed in 2 minute Cadence with the Transiting Exoplanet Survey Satellite", The Astrophysical Journal Supplement Series, 241 (1): 12, arXiv:1901.10148, Bibcode:2019ApJS..241...12S, doi:10.3847/1538-4365/ab04f5, ISSN 0067-0049 tau1 Eridani's database entry at VizieR.
- ^ Allende Prieto, C.; et al. (June 2004), "SN: A spectroscopic survey of stars in the solar neighborhood. The Nearest 15 pc", Astronomy and Astrophysics, 420: 183–205, arXiv:astro-ph/0403108, Bibcode:2004A&A...420..183A, doi:10.1051/0004-6361:20035801, S2CID 14393039. Vizier catalog entry
- Hempelmann, A.; et al. (February 2016), "Measuring rotation periods of solar-like stars using TIGRE. A study of periodic CaII H+K S-index variability", Astronomy and Astrophysics, 586: A14, Bibcode:2016A&A...586A..14H, doi:10.1051/0004-6361/201526972
- 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" (PDF), Astronomy and Astrophysics, 520: A79, arXiv:1002.4391, Bibcode:2010A&A...520A..79M, doi:10.1051/0004-6361/200913725, S2CID 43455849, archived from the original (PDF) on 2017-09-22, retrieved 2018-11-04.
- "* tau01 Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-04-15.
{{cite web}}: CS1 maint: postscript (link) - 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.
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