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{{Starbox begin
{{starbox short
⚫
| name = ε Hydri
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|constell= [[Hydrus (constellation)|Hydrus]]
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|name= Epsilon Hydri
|type= B9III <ref name=SIMBAD> SIMBAD, [http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Epsilon+Hydri&submit=SIMBAD+search Epsilon Hydri] (accessed 2 October 2012) </ref>
|ra= {{RA|02|39|35.36121}} <ref name=SIMBAD/>
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|dec= {{DEC|&minus;68|16|01.0103}} <ref name=SIMBAD/>
}}
}}
{{Starbox image
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'''Epsilon Hydri''' ('''ε Hyi''') is a [[star]] in the [[constellation]] [[Hydrus (constellation)|Hydrus]]. Its [[apparent magnitude]] is 4.06.
|image=
{{Location mark
|image=Hydrus constellation map.svg|alt=|float=center|width=280
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=Epsilon Hydri
|x=466|y=510
}}
|caption=Location of ε Hydri (circled)
}}
{{Starbox observe
| epoch = J2000
⚫
| constell = [[Hydrus (constellation)|Hydrus]]
| ra = {{RA|02|39|35.36121}}<ref name=vanLeeuwen2007>{{cite journal | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653 | year=2007 | last1=Van Leeuwen | first1=F. }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-S?HIP%2012394 Vizier catalog entry]</ref>
⚫
| dec = {{DEC|-68|16|01.0103}}<ref name=vanLeeuwen2007/>
| appmag_v = 4.12<ref name=XHIP>{{cite journal | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | title=XHIP: An extended hipparcos compilation | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | last1=Anderson | first1=E. | last2=Francis | first2=Ch. }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=V/137D/XHIP&HIP=12394 Vizier catalog entry]</ref>
}}
{{Starbox character
| class = B9Va<ref name=XHIP/>
| b-v = -0.06<ref name=Mallama2014>{{cite journal | bibcode=2014JAVSO..42..443M | title=Sloan Magnitudes for the Brightest Stars | journal=The Journal of the American Association of Variable Star Observers | volume=42 | pages=443 | author1=Mallama | first1=A. | year=2014 }}[http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/other/JAVSO/42.443/ugriz&HD=016978 Vizier catalog entry]</ref>
| u-b = -0.14<ref name=Mallama2014/>
}}
{{Starbox astrometry
| radial_v = +13.60<ref name=Gontcharov2006>{{Cite journal | doi=10.1134/S1063773706110065 | bibcode=2006AstL...32..759G| title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system| journal=Astronomy Letters| volume=32| issue=11| pages=759| year=2006| last1=Gontcharov| first1=G. A.}}</ref>
| prop_mo_ra = +87.30<ref name=vanLeeuwen2007/>
| prop_mo_dec = +0.09<ref name=vanLeeuwen2007/>
| parallax = 21.48
| p_error = 0.09
| parallax_footnote = <ref name=vanLeeuwen2007/>
| absmag_v = 0.78<ref name=XHIP/>
}}
{{Starbox detail
| mass = 2.64<ref name=Zorec2012>{{cite journal | arxiv=1201.2052 | bibcode=2012A&A...537A.120Z | doi=10.1051/0004-6361/201117691 | title=Rotational velocities of A-type stars | journal=Astronomy & Astrophysics | volume=537 | pages=A120 | year=2012 | last1=Zorec | first1=J. | last2=Royer | first2=F. }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/A%2bA/537/A120/table1&HD=16978 Vizier catalog entry]</ref>
| radius = 2.2<ref name=AllendePrieto>{{cite journal | bibcode=1999A&A...352..555A | arxiv=astro-ph/9911002 | title=Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures | journal=Astronomy and Astrophysics | volume=352 | pages=555 | author1=Allende Prieto | first1=C. | last2=Lambert | first2=D. L. | year=1999 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/A%2bA/352/555/table1&Name=HIP12394 Vizier catalog entry]</ref>
| temperature = 10,970<ref name=David2015>{{cite journal | bibcode=2015ApJ...804..146D | doi=10.1088/0004-637X/804/2/146 | arxiv=1501.03154 | title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets | journal=The Astrophysical Journal | volume=804 | issue=2 | pages=146 | year=2015 | last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A. }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/ApJ/804/146/table5&HIP=12394 Vizier catalog entry]</ref>
| luminosity = 60<ref name=Zorec2012/>
| rotational_velocity = 96<ref name=Zorec2012/>
| gravity = 4.33<ref name=David2015/>
}}
{{Starbox catalog
| names = [[Fifth Fundamental Catalogue|FK5]]&nbsp;95, [[Boss General catalogue|GC]]&nbsp;3240, [[Hipparcos catalogue|HIP]]&nbsp;12394, [[Harvard Revised catalogue|HR]]&nbsp;806, [[Henry Draper Catalogue|HD]]&nbsp;16978, [[Smithsonian Astrophysical Observatory catalogue|SAO]]&nbsp;248621
}}
{{Starbox reference
| Simbad = Epsilon+Hydri
}}
{{Starbox end}}

⚫
'''Epsilon Hydri''' (ε Hyi) is a class B9V<ref name=XHIP/> (blue main-sequence) [[star]] in the [[constellation]] [[Hydrus (constellation)|Hydrus]]. Its apparent magnitude is 4.12<ref name=XHIP/> and it is approximately 151.8 light years away based on parallax.<ref name=vanLeeuwen2007/>


==References==
==References==
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[[Category:Hydrus (constellation)]]
[[Category:Hydrus (constellation)]]
[[Category:B-type giants]]
[[Category:B-type main-sequence stars]]
[[Category:Bayer objects|Hydri, Epsilon]]
[[Category:Bayer objects|Hydri, Epsilon]]
[[Category:Hipparcos objects|012394]]
[[Category:HR objects|0806]]
[[Category:Henry Draper Catalogue objects|016978]]


{{giant-star-stub}}
{{Main-star-stub}}

Revision as of 12:01, 3 September 2016

ε Hydri
Location of ε Hydri (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Hydrus
Right ascension 02h 39m 35.36121s[1]
Declination −68° 16′ 01.0103″[1]
Apparent magnitude (V) 4.12[2]
Characteristics
Spectral type B9Va[2]
U−B color index -0.14[3]
B−V color index -0.06[3]
Astrometry
Radial velocity (Rv)+13.60[4] km/s
Proper motion (μ) RA: +87.30[1] mas/yr
Dec.: +0.09[1] mas/yr
Parallax (π)21.48 ± 0.09 mas[1]
Distance151.8 ± 0.6 ly
(46.6 ± 0.2 pc)
Absolute magnitude (MV)0.78[2]
Details
Mass2.64[5] M☉
Radius2.2[6] R☉
Luminosity60[5] L☉
Surface gravity (log g)4.33[7] cgs
Temperature10,970[7] K
Rotational velocity (v sin i)96[5] km/s
Other designations
FK5 95, GC 3240, HIP 12394, HR 806, HD 16978, SAO 248621
Database references
SIMBADdata

Epsilon Hydri (ε Hyi) is a class B9V[2] (blue main-sequence) star in the constellation Hydrus. Its apparent magnitude is 4.12[2] and it is approximately 151.8 light years away based on parallax.[1]

References

  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ a b c d e Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. Vizier catalog entry
  3. ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  4. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  5. ^ a b c Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. Vizier catalog entry
  6. ^ Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. Vizier catalog entry
  7. ^ a b David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. Vizier catalog entry
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