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| name = ω2 Scorpii
}}{{Starbox observe
| epoch = J2000.0
| constell = Scorpius
| ra = {{RA|16|07|24.32818}}
| dec = {{DEC|-20|52|07.5518}}
| appmag_v = +4.320[3]
}}{{Starbox character
| class = G6/8III[4]
| b-v = +0.850[3]
| u-b = +0.494[3]
}}{{Starbox astrometry
| radial_v = −5.4[7]
| prop_mo_ra = +44.81
| prop_mo_dec = −45.42
| parallax = 11.22
| p_error = 0.32
| parallax_footnote =
| absmag_v = −0.62[11]
}}{{Starbox detail
| mass = 3.27[11]
| radius = 15.6[13]
| luminosity = 141[14]
| temperature = {{Val|5363|42|fmt=commas}}[15]
| metal_fe = {{Val|+0.03|0.05}}[15]
| gravity = {{Val|2.62|0.11}}[15]
| rotational_velocity =
| age_myr = 282[11]
}}{{Starbox catalog
| names = Jabhat al Akrab,{{citation needed|date=May 2017}} ω2 Sco, 10 Scorpii, {{nowrap|BD−20° 4408}}, HD 144608, HIP 78990, HR 5997, SAO 184135.[19]
}}{{Starbox reference
| Simbad = ome02+Sco
}}{{Starbox end}}ω2 Scorpii, Latinised as Omega2 Scorpii, is a suspected[20] variable star in the zodiac constellation of Scorpius. A component of the visual double star ω Scorpii, it is bright enough to be seen with the naked eye having an apparent visual magnitude of +4.320.[3] The distance to this star, as determined using parallax measurements, is around 291 light years. The visual magnitude of this star is reduced by 0.38 because of extinction from interstellar dust.[11]
It is 0.05 degree north of the ecliptic, so can be occulted by the moon and planets.
This is a G-type giant star with a stellar classification of G6/8III.[4] With an estimated age of 282 million years,[11] it is an evolved, thin disk star that is currently on the red horizontal branch.[26] The interferometry-measured angular diameter of this star is {{nowrap|1.63 ± 0.10 mas}},[27] which, at its estimated distance, equates to a physical radius of nearly 16 times the radius of the Sun.[13] It has 3.27 times the mass of the Sun,[11] and radiates 141 times the Sun's luminosity[14] The effective temperature of the star's outer atmosphere is 5,363 K.[15]
References
1. ^1 2 {{citation | last1=Houk | first1=N. | last2=Smith-Moore | first2=M.|title=Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Declinations -26°.0 to -12°.0 | volume=4 | year=1988 | bibcode=1988mcts.book.....H | postscript=. }}
2. ^1 2 3 4 {{citation | display-authors=1 | last1 = Prugniel | first1 = P. | last2 = Vauglin | first2 = I. | last3 = Koleva | first3 = M. | title = The atmospheric parameters and spectral interpolator for the MILES stars | journal = Astronomy & Astrophysics | volume = 531 | pages = A165 | year = 2011 | doi = 10.1051/0004-6361/201116769 | bibcode = 2011A&A...531A.165P | arxiv = 1104.4952 | postscript=. }}
3. ^1 {{citation | last=Wilson | first=R. E. | year=1953 | title=General Catalogue of Stellar Radial Velocities | publisher=Carnegie Institute of Washington D.C. | bibcode=1953GCRV..C......0W | postscript=. }}
4. ^1 2 3 4 {{citation | last1=Kozok | first1=J. R. | title=Photometric observations of emission B-stars in the southern Milky Way | journal=Astronomy and Astrophysics Supplement Series | volume=61 | pages=387–405 | date=September 1985 | bibcode=1985A&AS...61..387K | postscript=. }}
5. ^1 {{citation | title=Chemical Compositions of Thin-disk, High-metallicity Red Horizontal-branch Field Stars | display-authors=1 | last1=Afşar | first1=M. | last2=Sneden | first2=C. | last3=For | first3=B.-Q. | journal=The Astronomical Journal | volume=144 | issue=1 | id=20 | pages=20 | date=July 2012 | doi=10.1088/0004-6256/144/1/20 | bibcode=2012AJ....144...20A | arxiv=1205.3659 | postscript=. }}
6. ^1 2 {{citation | display-authors=1 | last1=McDonald | first1=I. | last2=Zijlstra | first2=A. A. | last3=Boyer | first3=M. L. | title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars | journal=Monthly Notices of the Royal Astronomical Society | volume=427 | issue=1 | pages=343–57 | date=2012 | bibcode=2012MNRAS.427..343M | arxiv=1208.2037 | doi=10.1111/j.1365-2966.2012.21873.x | postscript=. }}
7. ^1 2 3 4 5 6 {{citation | title=Stellar Parameters and Elemental Abundances of Late-G Giants | display-authors=1 | last1=Takeda | first1=Yoichi | last2=Sato | first2=Bun'ei | last3=Murata | first3=Daisuke | journal=Publications of the Astronomical Society of Japan | volume=60 | issue=4 | pages=781–802 | date=August 2008 | doi=10.1093/pasj/60.4.781 | bibcode=2008PASJ...60..781T | arxiv=0805.2434 | postscript=. }}
8. ^1 {{citation | title=CHARM: A Catalog of High Angular Resolution Measurements | last1=Richichi | first1=A. | last2=Percheron | first2=I. | journal=Astronomy and Astrophysics | volume=386 | pages=492–503 | date=May 2002 | doi=10.1051/0004-6361:20020236 | bibcode=2002A&A...386..492R | postscript=. | citeseerx=10.1.1.170.2863}}
9. ^1 2 {{citation | first1=Kenneth R. | last1=Lang | title=Astrophysical formulae | volume=1 | series=Astronomy and astrophysics library | edition=3 | publisher=Birkhäuser | date=2006 | isbn=3-540-29692-1 | url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 | postscript=.}}. The radius (R*) is given by::
10. ^1 {{citation | title=uvby Photometry of the Suspected Variable omega2 Sco | last1=Sterken | first1=C. | journal=Information Bulletin on Variable Stars | volume=1230 | page=1 | date=January 1977 | bibcode=1977IBVS.1230....1S | postscript=. }}
11. ^1 {{cite simbad | title=* ome02 Sco | accessdate=2016-09-25 }}
[1][2][3][4][5][6][7][8][9][10][11]2. ^1 2 3 4 {{citation | display-authors=1 | last1 = Prugniel | first1 = P. | last2 = Vauglin | first2 = I. | last3 = Koleva | first3 = M. | title = The atmospheric parameters and spectral interpolator for the MILES stars | journal = Astronomy & Astrophysics | volume = 531 | pages = A165 | year = 2011 | doi = 10.1051/0004-6361/201116769 | bibcode = 2011A&A...531A.165P | arxiv = 1104.4952 | postscript=. }}
3. ^1 {{citation | last=Wilson | first=R. E. | year=1953 | title=General Catalogue of Stellar Radial Velocities | publisher=Carnegie Institute of Washington D.C. | bibcode=1953GCRV..C......0W | postscript=. }}
4. ^1 2 3 4 {{citation | last1=Kozok | first1=J. R. | title=Photometric observations of emission B-stars in the southern Milky Way | journal=Astronomy and Astrophysics Supplement Series | volume=61 | pages=387–405 | date=September 1985 | bibcode=1985A&AS...61..387K | postscript=. }}
5. ^1 {{citation | title=Chemical Compositions of Thin-disk, High-metallicity Red Horizontal-branch Field Stars | display-authors=1 | last1=Afşar | first1=M. | last2=Sneden | first2=C. | last3=For | first3=B.-Q. | journal=The Astronomical Journal | volume=144 | issue=1 | id=20 | pages=20 | date=July 2012 | doi=10.1088/0004-6256/144/1/20 | bibcode=2012AJ....144...20A | arxiv=1205.3659 | postscript=. }}
6. ^1 2 {{citation | display-authors=1 | last1=McDonald | first1=I. | last2=Zijlstra | first2=A. A. | last3=Boyer | first3=M. L. | title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars | journal=Monthly Notices of the Royal Astronomical Society | volume=427 | issue=1 | pages=343–57 | date=2012 | bibcode=2012MNRAS.427..343M | arxiv=1208.2037 | doi=10.1111/j.1365-2966.2012.21873.x | postscript=. }}
7. ^1 2 3 4 5 6 {{citation | title=Stellar Parameters and Elemental Abundances of Late-G Giants | display-authors=1 | last1=Takeda | first1=Yoichi | last2=Sato | first2=Bun'ei | last3=Murata | first3=Daisuke | journal=Publications of the Astronomical Society of Japan | volume=60 | issue=4 | pages=781–802 | date=August 2008 | doi=10.1093/pasj/60.4.781 | bibcode=2008PASJ...60..781T | arxiv=0805.2434 | postscript=. }}
8. ^1 {{citation | title=CHARM: A Catalog of High Angular Resolution Measurements | last1=Richichi | first1=A. | last2=Percheron | first2=I. | journal=Astronomy and Astrophysics | volume=386 | pages=492–503 | date=May 2002 | doi=10.1051/0004-6361:20020236 | bibcode=2002A&A...386..492R | postscript=. | citeseerx=10.1.1.170.2863}}
9. ^1 2 {{citation | first1=Kenneth R. | last1=Lang | title=Astrophysical formulae | volume=1 | series=Astronomy and astrophysics library | edition=3 | publisher=Birkhäuser | date=2006 | isbn=3-540-29692-1 | url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 | postscript=.}}. The radius (R*) is given by::
10. ^1 {{citation | title=uvby Photometry of the Suspected Variable omega2 Sco | last1=Sterken | first1=C. | journal=Information Bulletin on Variable Stars | volume=1230 | page=1 | date=January 1977 | bibcode=1977IBVS.1230....1S | postscript=. }}
11. ^1 {{cite simbad | title=* ome02 Sco | accessdate=2016-09-25 }}
}}
External links
- {{citation
| first1=James B. | last1=Kaler | date=September 9, 2016
| title=Omega-1 and Omega-2 Scorpii
| work=Stars | publisher=University of Illinois
| url=http://stars.astro.illinois.edu/sow/omegasco.html
| accessdate=2016-09-26 | postscript=. }}{{Stars of Scorpius|state=collapsed}}
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