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{{Starbox begin
{{starbox short
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| name = 20 Ophiuchi
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|constell= [[Ophiuchus (constellation)|Ophiuchus]]
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|name= 20 Ophiuchi
|type= F7V <ref name=SIMBAD>SIMBAD, [http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=20+Ophiuchi&submit=SIMBAD+search 20 Ophiuchi] (accessed 29 December 2012)</ref>
|ra= {{RA|16|49|50.01604}} <ref name=SIMBAD/>
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|dec= {{DEC|-10|46|58.7775}} <ref name=SIMBAD/>
}}
}}
{{Starbox image
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'''20 Ophiuchi''' ('''20 Oph''') is a [[star]] in the [[constellation]] [[Ophiuchus (constellation)|Ophiuchus]]. Its [[apparent magnitude]] is 4.65. It lies near the star Zeta Ophiuchi.
|image=
{{Location mark
|image=Ophiuchus constellation map.svg|alt=|float=center|width=280
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=20 Ophiuchi
|x=643|y=603
}}
|caption=Location of 20 Ophiuchi (circled)
}}
{{Starbox observe
| epoch = J2000
⚫
| constell = [[Ophiuchus (constellation)|Ophiuchus]]
| ra = {{RA|16|49|50.01604}}<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%2082369 Vizier catalog entry]</ref>
⚫
| dec = {{DEC|-10|46|58.7775}}<ref name=vanLeeuwen2007/>
| appmag_v = 4.64<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=82369 Vizier catalog entry]</ref>
}}
{{Starbox character
| class = F6IV<ref name=Gray2006>{{cite journal | doi=10.1086/504637 | bibcode=2006AJ....132..161G | arxiv=astro-ph/0603770| title=Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample | journal=The Astronomical Journal | volume=132 | pages=161 | year=2006 | last1=Gray | first1=R. O. | last2=Corbally | first2=C. J. | last3=Garrison | first3=R. F. | last4=McFadden | first4=M. T. | last5=Bubar | first5=E. J. | last6=McGahee | first6=C. E. | last7=O'Donoghue | first7=A. A. | last8=Knox | first8=E. R. }}</ref>
| b-v = +0.47<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=151769 Vizier catalog entry]</ref>
| u-b = +0.07<ref name=Mallama2014/>
}}
{{Starbox astrometry
| radial_v = -1.60<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 = +72.33<ref name=vanLeeuwen2007/>
| prop_mo_dec = -78.80<ref name=vanLeeuwen2007/>
| parallax = 31.27
| p_error = 2.16
| parallax_footnote = <ref name=vanLeeuwen2007/>
| absmag_v = 2.13<ref name=XHIP/>
}}
{{Starbox detail
| mass = 1.70<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=HIP82369 Vizier catalog entry]</ref>
| radius = 3.0<ref name=AllendePrieto/>
| temperature = 6,417<ref name=Wu2011>{{cite journal | bibcode=2011A&A...525A..71W | doi=10.1051/0004-6361/201015014 | arxiv=1009.1491 | title=Coudé-feed stellar spectral library – atmospheric parameters | journal=Astronomy & Astrophysics | volume=525 | pages=A71 | year=2010 | last1=Wu | first1=Yue | last2=Singh | first2=H. P. | last3=Prugniel | first3=P. | last4=Gupta | first4=R. | last5=Koleva | first5=M. }}</ref>
| luminosity = 12.06<ref name=XHIP/>
| rotational_velocity = 11.3<ref name=deMedeiros1999>{{cite journal | bibcode=1999A&AS..139..433D | doi=10.1051/aas:1999401 | title=A catalog of rotational and radial velocities for evolved stars | journal=Astronomy and Astrophysics Supplement Series | volume=139 | issue=3 | pages=433 | year=1999 | last1=De Medeiros | first1=J. R. | last2=Mayor | first2=M. }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/A%2bAS/139/433/table5&Name=HD%20151769 Vizier catalog entry]</ref>
| gravity = 3.89<ref name=Wu2011/>
| metal_fe = +0.13<ref name=Wu2011/>
}}
{{Starbox catalog
| names = [[Durchmusterung|BD]]-10°4394, [[Fifth Fundamental Catalogue|FK5]]&nbsp;1438, [[Boss General catalogue|GC]]&nbsp;22643, [[Hipparcos catalogue|HIP]]&nbsp;82369, [[Harvard Revised catalogue|HR]]&nbsp;6243, [[Henry Draper Catalogue|HD]]&nbsp;151769, [[Smithsonian Astrophysical Observatory catalogue|SAO]]&nbsp;160118
}}
{{Starbox reference
| Simbad = 20+Ophiuchi
}}
{{Starbox end}}

⚫
'''20 Ophiuchi''' is a class F6IV<ref name=Gray2006/> (yellow-white subgiant) [[star]] in the [[constellation]] [[Ophiuchus (constellation)|Ophiuchus]]. Its apparent magnitude is 4.64<ref name=XHIP/> and it is approximately 104 light years away based on parallax.<ref name=vanLeeuwen2007/> It lies near the star Zeta Ophiuchi.


==References==
==References==
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[[Category:Ophiuchus (constellation)]]
[[Category:Ophiuchus (constellation)]]
[[Category:F-type main-sequence stars]]
[[Category:F-type subgiants]]
[[Category:Durchmusterung objects|BD-10 4394]]
[[Category:Flamsteed objects|Ophiuchi, 20]]
[[Category:Flamsteed objects|Ophiuchi, 20]]
[[Category:Hipparcos objects|082369]]
[[Category:HR objects|6243]]
[[Category:Henry Draper Catalogue objects|151769]]


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{{Subgiant-star-stub}}

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{{main-star-stub}}

Revision as of 10:59, 2 December 2016

20 Ophiuchi
Location of 20 Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 16h 49m 50.01604s[1]
Declination −10° 46′ 58.7775″[1]
Apparent magnitude (V) 4.64[2]
Characteristics
Spectral type F6IV[3]
U−B color index +0.07[4]
B−V color index +0.47[4]
Astrometry
Radial velocity (Rv)-1.60[5] km/s
Proper motion (μ) RA: +72.33[1] mas/yr
Dec.: -78.80[1] mas/yr
Parallax (π)31.27 ± 2.16 mas[1]
Distance104 ± 7 ly
(32 ± 2 pc)
Absolute magnitude (MV)2.13[2]
Details
Mass1.70[6] M☉
Radius3.0[6] R☉
Luminosity12.06[2] L☉
Surface gravity (log g)3.89[7] cgs
Temperature6,417[7] K
Metallicity [Fe/H]+0.13[7] dex
Rotational velocity (v sin i)11.3[8] km/s
Other designations
BD-10°4394, FK5 1438, GC 22643, HIP 82369, HR 6243, HD 151769, SAO 160118
Database references
SIMBADdata

20 Ophiuchi is a class F6IV[3] (yellow-white subgiant) star in the constellation Ophiuchus. Its apparent magnitude is 4.64[2] and it is approximately 104 light years away based on parallax.[1] It lies near the star Zeta Ophiuchi.

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 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 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal. 132: 161. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637.
  4. ^ 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
  5. ^ 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.
  6. ^ a b 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 c Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv:1009.1491. Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014.
  8. ^ De Medeiros, J. R.; Mayor, M. (1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series. 139 (3): 433. Bibcode:1999A&AS..139..433D. doi:10.1051/aas:1999401. Vizier catalog entry
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