Tau1 Eridani: Difference between revisions

τ¹ Eridani
Observation data; Epoch J2000 Equinox J2000
Constellation	Eridanus
Right ascension	02h 45m 06.18710s
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☉
Surface gravity (log g)	4.34 cgs
Temperature	6,231 K
Metallicity [Fe/H]	−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

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Revision as of 11:56, 25 September 2023

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 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, it made perihelion passage at an estimated distance of 30.5 ly (9.35 pc).^[12]

Tau¹ Eridani was a latter designation of 90 Ceti.^[13]

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.^[14] This discovery was subsequently interpreted as indicating a debris disk with a radius near to 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.^[15]

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.^[16]

References

^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (November 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 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
^ 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.
^ ^a ^b 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.
^ Reiners, Ansgar (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, S2CID 8642707
^ ^a ^b ^c 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.
^ ^a ^b ^c Allende Prieto, C.; et al. (June 2004), "S⁴N: 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.
^ 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.
^ Backman, Dana E; et al. (1993), "Main-sequence stars with circumstellar solid material - The VEGA phenomenon", Protostars and planets III (A93-42937 17-90): 1253–1304, Bibcode:1993prpl.conf.1253B.
^ Weintraub, D. A.; et al. (1994). "A reinterpretation of millimeter observations of nearby IRAS excess stars". The Astronomical Journal. 108: 701. Bibcode:1994AJ....108..701W. doi:10.1086/117107.
^ Jura, M.; et al. (2004). "Mid‐Infrared Spectra of Dust Debris around Main‐Sequence Stars". The Astrophysical Journal Supplement Series. 154 (1): 453–457. arXiv:astro-ph/0405632. Bibcode:2004ApJS..154..453J. doi:10.1086/422975. S2CID 396660.

[aa474_2_653-1] ^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (November 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.

[MERMILLIOD-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.

[Abt-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.

[paas21_2_129-4] 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.

[Reiners2006-5] Reiners, Ansgar (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, S2CID 8642707

[pdaov15_121-6] 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.

[aj144_1_7-7] 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.

[aaa420_183-8] Allende Prieto, C.; et al. (June 2004), "S⁴N: 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

[rot_rate-9] 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

[aaa520_A79-10] 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.

[SIMBAD-11] "* tau01 Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-04-15.{{cite web}}: CS1 maint: postscript (link)

[aa575_A35-12] 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.

[13] 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.

[Backman1993-14] Backman, Dana E; et al. (1993), "Main-sequence stars with circumstellar solid material - The VEGA phenomenon", Protostars and planets III (A93-42937 17-90): 1253–1304, Bibcode:1993prpl.conf.1253B.

[Backman1994-15] Weintraub, D. A.; et al. (1994). "A reinterpretation of millimeter observations of nearby IRAS excess stars". The Astronomical Journal. 108: 701. Bibcode:1994AJ....108..701W. doi:10.1086/117107.

[Jura2004-16] Jura, M.; et al. (2004). "Mid‐Infrared Spectra of Dust Debris around Main‐Sequence Stars". The Astrophysical Journal Supplement Series. 154 (1): 453–457. arXiv:astro-ph/0405632. Bibcode:2004ApJS..154..453J. doi:10.1086/422975. S2CID 396660.

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@@ Line 1: / Line 1: @@
+{{short description|Binary star system in the constellation Eridanus}}
 {{DISPLAYTITLE:Tau<sup>1</sup> Eridani}}
 {{For|other star systems with this [[Bayer designation]]|Tau Eridani}}
 {{Starbox begin
- | name=HR 818
+ | name=τ<sup>1</sup> Eridani
 }}
 {{Starbox observe
- | epoch=2000
+ | epoch=J2000
  | constell=[[Eridanus (constellation)|Eridanus]]
  | ra={{RA|02|45|06.18710}}<ref name=aa474_2_653/>
@@ Line 12: / Line 13: @@
 }}
 {{Starbox character
- | class=F7V<ref name="Abt">{{Cite journal | doi = 10.1088/0067-0049/180/1/117| title = MK Classifications of Spectroscopic Binaries| journal = The Astrophysical Journal Supplement Series| volume = 180| pages = 117–118| year = 2009| last1 = Abt | first1 = H. A. | bibcode = 2009ApJS..180..117A}}</ref>
+ | class=F7V<ref name="Abt">{{Cite journal | doi = 10.1088/0067-0049/180/1/117| title = MK Classifications of Spectroscopic Binaries| journal = The Astrophysical Journal Supplement Series| volume = 180| issue = 1| pages = 117–118| year = 2009| last1 = Abt | first1 = H. A. | bibcode = 2009ApJS..180..117A| s2cid = 122811461}}</ref>
  | b-v=+0.48<ref name="MERMILLIOD"/>
  | u-b=+0.00<ref name="MERMILLIOD"/>
@@ Line 51: / Line 52: @@
  | metal_fe={{nowrap|−0.08 ± 0.06}}<ref name=aaa420_183/><!-- The Sun's absolute Metallicity is estimated by some to be between logǫFe ≈ 7.5 - 7.7, so the metallicity given of 7.59 for HR 818, in the paper, is nearly the same as the Sun's. The relative to the Sun -0.08 figure is calculated from this paper, by VizieR, see - http://vizier.cfa.harvard.edu/viz-bin/VizieR-5?-out.add=.&-source=J/A%2bA/420/183/table%5b235%5d&HIP=12843 -->
  | age_gyr=
+ | rotation = {{val|3.847|ul=days}}<ref name=rot_rate/>
  | rotational_velocity=28.02<ref name=aaa520_A79/>
-}}
-{{Starbox reference
-| Simbad = Tau1+Eridani
-| NSTED = <!--Exoplanet Archive name-->
-| ARICNS = <!--Code-->
-| EPE = <!--Name-->
-| KIC = <!--KIC identifier-->
 }}
 {{Starbox catalog
- | names=[[Flamsteed designation|1]]&nbsp;Eridani, [[Bonner Durchmusterung|BD]]−19&nbsp;518, GJ 111, [[Henry Draper Catalogue|HD]]&nbsp;17206, [[Hipparcos catalogue|HIP]]&nbsp;12843, HR&nbsp;818, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;11557.<ref name=SIMBAD/>
+ | names={{odlist | F=1&nbsp;Eri | BD=−19°518 | FK5=2075 | GJ=111 | HD=17206 | HIP=12843 | HR=818 | SAO=11557 }}<ref name=SIMBAD/>
+}}
+{{Starbox reference
+ | Simbad=tau01+Eri
 }}
 {{Starbox end}}
-'''Tau<sup>1</sup> Eridani''' ('''τ<sup>1</sup> Eri''') is a [[binary star]] in the [[constellation]] [[Eridanus (constellation)|Eridanus]]. It has an [[apparent magnitude]] of 4.46, making it visible to the naked eye in suitably dark conditions. This a [[spectroscopic binary]] with an orbital period of 958 days.<ref name=pdaov15_121/> It is located about 46&nbsp;[[light year]]s from the Earth.<ref name=aa474_2_653/>
+'''Tau<sup>1</sup> Eridani''', [[Latinisation of names|Latinized]] from τ<sup>1</sup> Eridani, is a [[binary star]]<ref name=pdaov15_121/> system in the [[constellation]] [[Eridanus (constellation)|Eridanus]]. It has an [[apparent magnitude]] of 4.46, making it visible to the naked eye in suitably dark conditions. This a [[spectroscopic binary]] with an orbital period of 958 days.<ref name=pdaov15_121/> It is located about 46&nbsp;[[light year]]s from the Earth.<ref name=aa474_2_653/> At present, the system is moving away from the Sun with a [[radial velocity]] of +26&nbsp;km/s.<ref name=paas21_2_129/> About 305,000 years ago, it made [[perihelion]] passage at an estimated distance of {{Convert|9.35|pc|ly|order=flip|abbr=on}}.<ref name=aa575_A35>{{citation
+ | last1=Bailer-Jones | first1=C. A. L.
+ | title=Close encounters of the stellar kind
+ | journal=Astronomy & Astrophysics
+ | volume=575 | id=A35 | pages=13 | date=March 2015
+ | doi=10.1051/0004-6361/201425221 | bibcode=2015A&A...575A..35B
+ | postscript=. |arxiv = 1412.3648 | s2cid=59039482
+ }}</ref>
 Tau<sup>1</sup> Eridani was a latter designation of '''90 Ceti'''.<ref>{{cite journal
  | last=Wagman | first=M.
  | title=Flamsteed's Missing Stars
- | journal=Journal for the History of Astronomy, Vol.18, NO. 3/AUG, P.209, 1987
+ | journal=Journal for the History of Astronomy |issue=3 | volume=18 | page=215 |date=August 1987
+ | bibcode=1987JHA....18..209W | doi=10.1177/002182868701800305| s2cid=118445625
- | volume=18 | page=215 |date=August 1987
+ }}</ref>
- | bibcode=1987JHA....18..209W | doi=10.1177/002182868701800305}}</ref>
 == Debris disk ==
@@ Line 82: / Line 87: @@
 {{reflist|refs=
+<ref name=Reiners2006>{{citation | last1=Reiners | first1=Ansgar | title=Rotation- and temperature-dependence of stellar latitudinal differential rotation | journal=Astronomy and Astrophysics | volume=446 | issue=1 |date=January 2006 | pages=267–277 | doi=10.1051/0004-6361:20053911 | bibcode=2006A&A...446..267R |arxiv = astro-ph/0509399 | s2cid=8642707 }}</ref>
-<ref name=Reiners2006>{{citation
- | title=Rotation- and temperature-dependence of stellar latitudinal differential rotation
- | last=Reiners | first=A. | journal=Astronomy and Astrophysics
- | volume=446 | issue=1 | pages=267–277  | date=January  2006
- | doi=10.1051/0004-6361:20053911 | bibcode=2006A&A...446..267R
- | arxiv=astro-ph/0509399 | postscript=. }}</ref>
-<ref name="SIMBAD">{{citation
+<ref name="SIMBAD">{{cite simbad
- | title=tau01 Eri  -- Spectroscopic binary
+ | title=* tau01 Eri
- | work=SIMBAD Astronomical Database
- | publisher=Centre de Données astronomiques de Strasbourg
- | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Tau1+Eridani
  | accessdate=2015-04-15
  | postscript=.
@@ Line 107: / Line 104: @@
  | doi=10.1051/0004-6361:20078357
  | arxiv=0708.1752
+ | s2cid=18759600
  | postscript=.
 }}</ref>
@@ Line 120: / Line 118: @@
  | volume=420 | pages=183–205 | date=June 2004
  | doi=10.1051/0004-6361:20035801 | bibcode=2004A&A...420..183A
- | arxiv = astro-ph/0403108 | postscript=.
+ | arxiv = astro-ph/0403108 | s2cid=14393039 | postscript=.
 }}
 [http://vizier.cfa.harvard.edu/viz-bin/VizieR-5?-out.add=.&-source=J/A%2bA/420/183/table%5b235%5d&HIP=12843 Vizier catalog entry ]</ref>
@@ Line 136: / Line 134: @@
  | volume=21 | issue=2 | pages=129–133
  | doi=10.1071/AS04013 | bibcode=2004PASA...21..129N | postscript=.
-}}</ref>
+| doi-access=free}}</ref>
 <ref name=aaa520_A79>{{citation
  | display-authors=1
- | last1=Martínez-Arnáiz | first1=R.
+ | last1=Martínez-Arnáiz
+ | first1=R.
- | last2=Maldonado | first2=J.
+ | last2=Maldonado
+ | first2=J.
- | last3=Montes | first3=D.
+ | last3=Montes
+ | first3=D.
- | last4=Eiroa | first4=C.
+ | last4=Eiroa
+ | first4=C.
- | last5=Montesinos | first5=B.
+ | last5=Montesinos
+ | first5=B.
  | title=Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter
  | journal=Astronomy and Astrophysics
- | volume=520 | page=A79 | date=September 2010
+ | volume=520
+ | page=A79
+ | date=September 2010
  | doi=10.1051/0004-6361/200913725
  | bibcode=2010A&A...520A..79M
- | arxiv=1002.4391 | postscript=.
+ | arxiv=1002.4391
+ | s2cid=43455849
+ | postscript=.
+ | url=http://eprints.ucm.es/37826/1/davidmontes17libre.pdf
-}}</ref>
+ | access-date=2018-11-04
+ | archive-date=2017-09-22
+ | archive-url=https://web.archive.org/web/20170922031257/http://eprints.ucm.es/37826/1/davidmontes17libre.pdf
+ | url-status=dead
+ }}</ref>
 <ref name="MERMILLIOD">{{citation
  | last=Mermilliod | first=J.-C.
  | title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)
- | journal=Catalogue of Eggen's UBV data
+ | journal=Catalogue of Eggen's UBV Data
  | date=1986
  | publisher=SIMBAD
@@ Line 184: / Line 196: @@
  | volume=144 | issue=1 | id=7 | pages=10 | date=July 2012
  | bibcode=2012AJ....144....7T | doi=10.1088/0004-6256/144/1/7
- | arxiv=1204.4206 | postscript=.
+ | arxiv=1204.4206 | s2cid=30955275 | postscript=.
 }}</ref>
@@ Line 199: / Line 211: @@
 }}</ref>
-<ref name="Backman1994">{{Cite journal | doi = 10.1086/117107| title = A reinterpretation of millimeter observations of nearby IRAS excess stars| journal = The Astronomical Journal| volume = 108| pages = 701| year = 1994| last1 = Weintraub | first1 = D. A. | last2 = Stern | first2 = S. A.| display-authors=1 |bibcode = 1994AJ....108..701W }}</ref>
+<ref name="Backman1994">{{Cite journal | doi = 10.1086/117107| title = A reinterpretation of millimeter observations of nearby IRAS excess stars| journal = The Astronomical Journal| volume = 108| pages = 701| year = 1994| last1 = Weintraub | first1 = D. A. | last2 = Stern | first2 = S. A.| display-authors=1 |bibcode = 1994AJ....108..701W | doi-access = free}}</ref>
+<ref name="Jura2004">{{Cite journal | doi = 10.1086/422975| title = Mid‐Infrared Spectra of Dust Debris around Main‐Sequence Stars| journal = The Astrophysical Journal Supplement Series| volume = 154| issue = 1| pages = 453–457| year = 2004| last1 = Jura | first1 = M.| last2 = Chen | first2 = C. H.| last3 = Furlan | first3 = E.| last4 = Green | first4 = J.| last5 = Sargent | first5 = B.| last6 = Forrest | first6 = W. J.| last7 = Watson | first7 = D. M.| last8 = Barry | first8 = D. J.| last9 = Hall | first9 = P.| last10 = Herter | first10 = T. L.| last11 = Houck | first11 = J. R.| last12 = Sloan | first12 = G. C.| last13 = Uchida | first13 = K.| last14 = d’Alessio | first14 = P.| last15 = Brandl | first15 = B. R.| last16 = Keller | first16 = L. D.| last17 = Kemper | first17 = F.| last18 = Morris | first18 = P.| last19 = Najita | first19 = J.| last20 = Calvet | first20 = N.| last21 = Hartmann | first21 = L.| last22 = Myers | first22 = P. C.| display-authors=1|arxiv = astro-ph/0405632 |bibcode = 2004ApJS..154..453J | s2cid = 396660}}</ref>
+<ref name=rot_rate>{{citation
+ | display-authors=1
+ | last1=Hempelmann | first1=A.
+ | last2=Mittag| first2=M.
+ | last3=Gonzalez-Perez| first3=J.
+ | last4=Schmitt| first4=J.
+ | last5=Schroder| first5=K.
+ | title=Measuring rotation periods of solar-like stars using TIGRE. A study of periodic CaII H+K S-index variability
+ | journal=Astronomy and Astrophysics
+ | volume=586 | page=A14 | date=February 2016
+ | doi=10.1051/0004-6361/201526972| bibcode=2016A&A...586A..14H | doi-access=free
+ }}</ref>
-<ref name="Jura2004">{{Cite journal | doi = 10.1086/422975| title = Mid‐Infrared Spectra of Dust Debris around Main‐Sequence Stars| journal = The Astrophysical Journal Supplement Series| volume = 154| pages = 453–457| year = 2004| last1 = Jura | first1 = M.| last2 = Chen | first2 = C. H.| last3 = Furlan | first3 = E.| last4 = Green | first4 = J.| last5 = Sargent | first5 = B.| last6 = Forrest | first6 = W. J.| last7 = Watson | first7 = D. M.| last8 = Barry | first8 = D. J.| last9 = Hall | first9 = P.| last10 = Herter | first10 = T. L.| last11 = Houck | first11 = J. R.| last12 = Sloan | first12 = G. C.| last13 = Uchida | first13 = K.| last14 = d’Alessio | first14 = P.| last15 = Brandl | first15 = B. R.| last16 = Keller | first16 = L. D.| last17 = Kemper | first17 = F.| last18 = Morris | first18 = P.| last19 = Najita | first19 = J.| last20 = Calvet | first20 = N.| last21 = Hartmann | first21 = L.| last22 = Myers | first22 = P. C.| display-authors=1|arxiv = astro-ph/0405632 |bibcode = 2004ApJS..154..453J }}</ref>
 }}
@@ Line 207: / Line 234: @@
 {{Stars of Eridanus|stat=collapsed}}
+{{DEFAULTSORT:Tau1 Eridani}}
-[[Category:Eridanus (constellation)]]
 [[Category:F-type main-sequence stars]]
+[[Category:Spectroscopic binaries]]
+[[Category:Eridanus (constellation)]]
 [[Category:Bayer objects|Eridani, Tau1]]
-[[Category:Gliese and GJ objects|0111]]
+[[Category:Durchmusterung objects]]
-[[Category:Binary stars]]
-[[Category:Hipparcos objects|012843]]
 [[Category:Flamsteed objects|Eridani, 01]]
-[[Category:HR objects|0818]]
+[[Category:Gliese and GJ objects|0111]]
 [[Category:Henry Draper Catalogue objects|017206]]
+[[Category:Hipparcos objects|012843]]
+[[Category:Bright Star Catalogue objects|0818]]
-{{main-star-stub}}
-{{multi-star-stub}}

Observation data Epoch J2000 Equinox J2000
Constellation	Eridanus
Right ascension	02^h 45^m 06.18710^s^[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 (R_v)	+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]
Distance	46 ± 1 ly (14.2 ± 0.4 pc)
Absolute magnitude (M_V)	+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

Mass	1.15^[7] `M`_☉
Surface gravity (log g)	4.34^[8] cgs
Temperature	6,231^[8] K
Metallicity [Fe/H]	−0.08 ± 0.06^[8] dex
Rotation	3.847 d^[9]
Rotational velocity (v sin i)	28.02^[10] km/s

Other designations
1 Eri, BD−19°518, FK5 2075, GJ 111, HD 17206, HIP 12843, HR 818, SAO 11557^[11]
Database references
SIMBAD	data