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{{Starbox begin
{{starbox short
⚫
| name = 68 Ophiuchi
⚫
|constell= [[Ophiuchus]]
⚫
|name= 68 Ophiuchi
|type= A2Vn
⚫
|ra= {{RA|18|01|45.19884}} <ref name=SIMBAD/>
|dec= {{DEC|+01|18|18.2775}} <ref name=SIMBAD/>
}}
}}
{{Starbox image
⚫
'''68 Ophiuchi''' is a [[star]] in the [[constellation]] [[Ophiuchus]]. Its [[apparent magnitude]] is 4.44. Located around {{convert|89.69|pc|ly}} distant, it is a [[A-type main-sequence star|blue-white main-sequence star]] of spectral type A2Vn,<ref name=SIMBAD>{{cite web |url =http://simbad.u-strasbg.fr/simbad/sim-id?Ident=68+oph&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id |title = 68 Ophiuchi |work = SIMBAD Astronomical Database|publisher=Centre de Données astronomiques de Strasbourg |accessdate = 28 July 2014}}</ref> a star that is currently fusing its core [[hydrogen]]. The star is suspected of varying between magnitudes 4.42 and 4.48.<ref name=AAVSOR>{{cite web|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=48633 |title=NSV 10009|author=VSX|date=17 December 2005|work=AAVSO Website|publisher=American Association of Variable Star Observers|accessdate=28 July 2014}}</ref>
|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=68 Ophiuchi
|x=270|y=353
}}
|caption=Location of 68 Ophiuchi (circled)
}}
{{Starbox observe
| epoch = J2000
⚫
| constell = [[Ophiuchus (constellation)|Ophiuchus]]
| ra = {{RA|18|01|45.19884}}<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%2088290 Vizier catalog entry]</ref>
⚫
| dec = {{DEC|1|18|18.2775}}<ref name=vanLeeuwen2007/>
| appmag_v = 4.42<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=88290 Vizier catalog entry]</ref>
}}
{{Starbox character
| class = A2Vn<ref name=Hoffleit1991>{{cite journal | bibcode=1995yCat.5050....0H | title=VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991) | journal=VizieR On-line Data Catalog: V/50. Originally published in: 1964BS....C......0H | volume=5050 | author1=Hoffleit | first1=D. | last2=Warren | first2=W. H. | year=1995 }}</ref>
| b-v = +0.04<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=164577 Vizier catalog entry]</ref>
| u-b = +0.02<ref name=Mallama2014/>
}}
{{Starbox astrometry
| radial_v = +6.00<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 = +15.93<ref name=vanLeeuwen2007/>
| prop_mo_dec = -13.29<ref name=vanLeeuwen2007/>
| parallax = 11.15
| p_error = 0.60
| parallax_footnote = <ref name=vanLeeuwen2007/>
| absmag_v = -0.34<ref name=XHIP/>
}}
{{Starbox detail
| mass = 3.07<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=164577 Vizier catalog entry]</ref>
| radius = 4.5<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=HIP88290 Vizier catalog entry]</ref>
| temperature = 9,594<ref name=Zorec2012/>
| luminosity = 160<ref name=Zorec2012/>
| rotational_velocity = 201<ref name=Zorec2012/>
| gravity = 3.76<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=88290 Vizier catalog entry]</ref>
| metal_fe = -0.14<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>
}}
{{Starbox catalog
| names = [[Durchmusterung|BD]]+01°3560, [[Catalog of Components of Double and Multiple Stars|CCDM]]&nbsp;J18018+0118AB, [[Boss General catalogue|GC]]&nbsp;24534, [[Hipparcos catalogue|HIP]]&nbsp;88290, [[Harvard Revised catalogue|HR]]&nbsp;6723, [[Henry Draper Catalogue|HD]]&nbsp;164577, [[New Catalogue of Suspected Variable Stars|NSV]]&nbsp;10009, [[Smithsonian Astrophysical Observatory catalogue|SAO]]&nbsp;123035, [[Washington Double Star Catalog|WDS]]&nbsp;J18018+0118AB
}}
{{Starbox reference
| Simbad = 68+Ophiuchi
}}
{{Starbox end}}

⚫
'''68 Ophiuchi''' is a [[star]] in the [[constellation]] [[Ophiuchus]]. Its [[apparent magnitude]] is 4.42.<ref name=XHIP/> Located around {{convert|89.69|pc|ly}} distant,<ref name=vanLeeuwen2007/> it is a [[A-type main-sequence star|blue-white main-sequence star]] of spectral type A2Vn,<ref name=Hoffleit1991/> a star that is currently fusing its core [[hydrogen]]. The star is suspected of varying between magnitudes 4.42 and 4.48.<ref name=AAVSOR>{{cite web|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=48633 |title=NSV 10009|author=VSX|date=17 December 2005|work=AAVSO Website|publisher=American Association of Variable Star Observers|accessdate=28 July 2014}}</ref>

It is a binary, with a companion, B, of magnitude 7.48, in an orbit with period 176 years and eccentricity 0.83.<ref name=Malkov2012>{{cite journal | bibcode=2012A&A...546A..69M | doi=10.1051/0004-6361/201219774 | title=Dynamical masses of a selected sample of orbital binaries | journal=Astronomy & Astrophysics | volume=546 | pages=A69 | year=2012 | last1=Malkov | first1=O. Yu. | last2=Tamazian | first2=V. S. | last3=Docobo | first3=J. A. | last4=Chulkov | first4=D. A. }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/A%2bA/546/A69/table1&WDS=18018%2B0118 Vizier catalog entry]</ref><ref name=Cvetkovic2010>{{cite journal | bibcode=2010SerAJ.180...71C| title=On the Component Masses of Visual Binaries| journal=Serbian Astronomical Journal| volume=180| issue=180| pages=71| author1=Cvetkovic| first1=Z.| last2=Ninkovic| first2=S.| year=2010| doi=10.2298/SAJ1080071C}}</ref>


==References==
==References==
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[[Category:Ophiuchus (constellation)]]
[[Category:Ophiuchus (constellation)]]
⚫
[[Category:Flamsteed objects|Ophiuchi, 68]]
[[Category:A-type main-sequence stars]]
[[Category:A-type main-sequence stars]]
[[Category:Durchmusterung objects|BD+01 3560]]
⚫
[[Category:Flamsteed objects|Ophiuchi, 68]]
[[Category:Hipparcos objects|088290]]
[[Category:HR objects|6723]]
[[Category:Henry Draper Catalogue objects|164577]]
[[Category:Suspected variables]]


{{main-star-stub}}
{{Main-star-stub}}
{{multi-star-stub}}

Revision as of 10:09, 2 December 2016

68 Ophiuchi
Location of 68 Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 18h 01m 45.19884s[1]
Declination 1° 18′ 18.2775″[1]
Apparent magnitude (V) 4.42[2]
Characteristics
Spectral type A2Vn[3]
U−B color index +0.02[4]
B−V color index +0.04[4]
Astrometry
Radial velocity (Rv)+6.00[5] km/s
Proper motion (μ) RA: +15.93[1] mas/yr
Dec.: -13.29[1] mas/yr
Parallax (π)11.15 ± 0.60 mas[1]
Distance290 ± 20 ly
(90 ± 5 pc)
Absolute magnitude (MV)-0.34[2]
Details
Mass3.07[6] M☉
Radius4.5[7] R☉
Luminosity160[6] L☉
Surface gravity (log g)3.76[8] cgs
Temperature9,594[6] K
Metallicity [Fe/H]-0.14[9] dex
Rotational velocity (v sin i)201[6] km/s
Other designations
BD+01°3560, CCDM J18018+0118AB, GC 24534, HIP 88290, HR 6723, HD 164577, NSV 10009, SAO 123035, WDS J18018+0118AB
Database references
SIMBADdata

68 Ophiuchi is a star in the constellation Ophiuchus. Its apparent magnitude is 4.42.[2] Located around 89.69 parsecs (292.5 ly) distant,[1] it is a blue-white main-sequence star of spectral type A2Vn,[3] a star that is currently fusing its core hydrogen. The star is suspected of varying between magnitudes 4.42 and 4.48.[10]

It is a binary, with a companion, B, of magnitude 7.48, in an orbit with period 176 years and eccentricity 0.83.[11][12]

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 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 Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
  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 c d 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
  7. ^ 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
  8. ^ 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
  9. ^ 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.
  10. ^ VSX (17 December 2005). "NSV 10009". AAVSO Website. American Association of Variable Star Observers. Retrieved 28 July 2014.
  11. ^ Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). "Dynamical masses of a selected sample of orbital binaries". Astronomy & Astrophysics. 546: A69. Bibcode:2012A&A...546A..69M. doi:10.1051/0004-6361/201219774. Vizier catalog entry
  12. ^ Cvetkovic, Z.; Ninkovic, S. (2010). "On the Component Masses of Visual Binaries". Serbian Astronomical Journal. 180 (180): 71. Bibcode:2010SerAJ.180...71C. doi:10.2298/SAJ1080071C.
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