SkipCaptcha
1,279
edits
Changes
Jump to navigation
Jump to search
{{Night Sky
| image =
| designation =φ Orionis<br/>37 Orionis
| rightascension =05<sup>h</sup> 34<sup>m</sup> 49.2380<sup>s</sup><ref name=simbad>{{cite web|url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=37+orionis&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id|title=37 Orionis|accessdate=July 09, 2020|work=Simbad Astronomical Database|publisher=simbad.u-strasbg.fr}}</ref><ref name=hip>{{cite journal
|last1=van Leeuwen |first1=F.
|title=Validation of the new Hipparcos reduction
|journal=Astronomy & Astrophysics
|volume=474
|issue=2|page=653-664|date=2007
|doi=10.1051/0004-6361:20078357
|bibcode=2007A&A...474..653V
|ref=harv
}} {{arXiv|0708.1752}}</ref>
| declination =+09° 29′ 22.4878″<ref name=simbad/><ref name=hip/>
| distance =1087.21 ly<ref name=universeguide>{{cite web|url=https://www.universeguide.com/star/26176/phi1orionis|title=Phi1 Orionis (37 Orionis) Star Facts|accessdate=July 09, 2020|publisher=universeguide.com}}</ref>
| constellation =Orion
| type =Main sequence star
| dimensions =
| magnitude =Apparent Mag: +4.39<ref name=universeguide/><br/>Absolute Mag: -3.01 / -3.22<ref name=universeguide/>
| redshift =
| radvelocity =33.2 ± 0.9 km/s<ref name=simbad/><ref>
{{cite journal
|last1=Wilson |first1=Raplh Elmer
|display-authors=3
|title=General Catalogue of Stellar Radial Velocities
|journal=Washington, [Carnegie Institution of Washington]
|date=1953
|bibcode=1953GCRV..C......0W
|ref=harv
}}
</ref>
| propmotion =RA: 0.27 mas/yr<ref name=simbad/><ref name=hip/><br/>Dec: -2.26 mas/yr<ref name=simbad/><ref name=hip/>
| parallax =3.00 ± 0.25 mas<ref name=simbad/><ref name=hip/>
}}
'''Phi Orionis''' (37 Orionis, φ Orionis) is a [[main sequence star]] in the [[constellation]] of [[Orion]].<ref name=illinois>{{cite web|url=http://stars.astro.illinois.edu/sow/phi1ori.html|title=PHI-1 ORI|accessdate=July 09, 2020|publisher=stars.astr.illinois.edu|author=Jim Kaller|date=February 02, 2012|work=Stars}}</ref> The name "Phi Orion" actually refers to two unrelated stars in Orion that happen to appear near each other, disgnated Phi-1 Orion and Phi-2 Orion.<ref>{{cite web|url=http://www.glyphweb.com/esky/stars/phi1orionis.html|title=Phi1 Orionis|accessdate=July 09, 2020|publisher=glyphweb.com}}</ref> Here we mainly consider Phi-1 Orion. They are seperated by 0.71° degrees in the night sky and along with the star [[Meissa]], form a lesser known triangle.<ref>{{cite web|url=https://www.constellation-guide.com/constellation-list/orion-constellation/|title=Orion Constellation|accessdate=July 09, 2020|publisher=constellation-guide}}</ref> The two stars along with [[Lamda Orionis]] are situated in a red [[emission nebula]] designated Sh2-264.<ref>{{cite web|url=https://www.sciencephoto.com/media/329774/view/ccd-optical-image-of-nebula-around-lambda-orionis|title=CCD optical image of nebula around Lambda Orionis|accessdate=July 09, 2020|publisher=sciencephoto.com}}</ref>
Phi-1 Orionis is located nine times further away from [[Earth]] than Phi-2 Orionis at a distance of 1087.21 [[light year]]s.<ref name=universeguide/> The star is significantly larger than the [[Sun]] with a mass of 14 [[solar mass]]es and a radius 6.9 times larger than Sol's.<ref name=illinois/> Its extrodinarily high surface temperature of 28,900 kelvin means it radiates vast quantities of radiation in the [[ultraviolet]] portion of the [[electromagnetic spectrum]]. It also constributes to Phi-1 Orionis' high luminosity of 29,650 times larger than the Sun's.<ref name=illinois/> It's equator rotates at 28 kilometers per second, or equivalently the star rotates with a period of just under 12.3 days, fairly slow compared to most stars. The star is known from [[spectroscopy]] to have a companion star, making it a [[binary star|binary system]].<ref>
{{cite journal
|last1=Struve |first1=O.
|last2= |first2=
|last3= |first3=
|last4= |first4=
|last5= |first5=
|last6= |first6=
|last7= |first7=
|last8= |first8=
|last9= |first9=
|display-authors=3
|title=Preliminary orbit of the long-period spectroscopic binary 37 phi-1 Orionis.
|journal=Astrophysical Journal
|volume=63
|issue=|page=60-66|date=1926
|doi=10.1086/142950
|bibcode=1926ApJ....63...60S
|ref=harv
}}
</ref> They [[orbit]] each other with a period of 8.4 years and an orbital seperation of 10 [[Astronomical Unit]]s.<ref name=illinois/>
==Phi-2 Orionis==
Phi-2 Orionis ([[Flamsteed deignation]] 40 Orionis) is a [[hypergiant star]] and is situated much closer than Phi-1 Orionis, at around 117.48 light years.<ref>{{cite web|url=http://informationaboutstars.com/starinfo.dc/star/id-112958/|title=φ Orionis|accessdate=July 09, 2020|publisher=informationaboutstars.com}}</ref><ref>{{cite web|url=https://theskylive.com/sky/stars/phi2-orionis-star|title=φ2 Orionis (phi2 Orionis)|accessdate=July 09, 2020|publisher=theskylive.com}}</ref> It is slightly brighter in the night sky than its counterpart at magnitude +4.1 as it is much closer; intrinsically it is only 34.8 times brighter than the Sun.<ref>{{cite web|url=https://www.universeguide.com/star/26366/phi2orionis|title=Phi2 Orionis (40 Orionis) Star Facts|accessdate=July 09, 2020|publisher=universeguide.com}}</ref> It is 6.95 times the size of the Sun and has a surface temperature of 4,948 Kelvin.
==References==
{{reflist}}
{{Stars}}
[[Category:Astronomy]]
[[Category:Stars]]
Created page with " {{Night Sky | image = | designation =φ Orionis<br/>37 Orionis | rightascension =05<sup>h</sup> 34<sup>m</sup> 49.2380<sup>s</sup><ref name=simbad>{{cite web|u..."
{{Night Sky
| image =
| designation =φ Orionis<br/>37 Orionis
| rightascension =05<sup>h</sup> 34<sup>m</sup> 49.2380<sup>s</sup><ref name=simbad>{{cite web|url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=37+orionis&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id|title=37 Orionis|accessdate=July 09, 2020|work=Simbad Astronomical Database|publisher=simbad.u-strasbg.fr}}</ref><ref name=hip>{{cite journal
|last1=van Leeuwen |first1=F.
|title=Validation of the new Hipparcos reduction
|journal=Astronomy & Astrophysics
|volume=474
|issue=2|page=653-664|date=2007
|doi=10.1051/0004-6361:20078357
|bibcode=2007A&A...474..653V
|ref=harv
}} {{arXiv|0708.1752}}</ref>
| declination =+09° 29′ 22.4878″<ref name=simbad/><ref name=hip/>
| distance =1087.21 ly<ref name=universeguide>{{cite web|url=https://www.universeguide.com/star/26176/phi1orionis|title=Phi1 Orionis (37 Orionis) Star Facts|accessdate=July 09, 2020|publisher=universeguide.com}}</ref>
| constellation =Orion
| type =Main sequence star
| dimensions =
| magnitude =Apparent Mag: +4.39<ref name=universeguide/><br/>Absolute Mag: -3.01 / -3.22<ref name=universeguide/>
| redshift =
| radvelocity =33.2 ± 0.9 km/s<ref name=simbad/><ref>
{{cite journal
|last1=Wilson |first1=Raplh Elmer
|display-authors=3
|title=General Catalogue of Stellar Radial Velocities
|journal=Washington, [Carnegie Institution of Washington]
|date=1953
|bibcode=1953GCRV..C......0W
|ref=harv
}}
</ref>
| propmotion =RA: 0.27 mas/yr<ref name=simbad/><ref name=hip/><br/>Dec: -2.26 mas/yr<ref name=simbad/><ref name=hip/>
| parallax =3.00 ± 0.25 mas<ref name=simbad/><ref name=hip/>
}}
'''Phi Orionis''' (37 Orionis, φ Orionis) is a [[main sequence star]] in the [[constellation]] of [[Orion]].<ref name=illinois>{{cite web|url=http://stars.astro.illinois.edu/sow/phi1ori.html|title=PHI-1 ORI|accessdate=July 09, 2020|publisher=stars.astr.illinois.edu|author=Jim Kaller|date=February 02, 2012|work=Stars}}</ref> The name "Phi Orion" actually refers to two unrelated stars in Orion that happen to appear near each other, disgnated Phi-1 Orion and Phi-2 Orion.<ref>{{cite web|url=http://www.glyphweb.com/esky/stars/phi1orionis.html|title=Phi1 Orionis|accessdate=July 09, 2020|publisher=glyphweb.com}}</ref> Here we mainly consider Phi-1 Orion. They are seperated by 0.71° degrees in the night sky and along with the star [[Meissa]], form a lesser known triangle.<ref>{{cite web|url=https://www.constellation-guide.com/constellation-list/orion-constellation/|title=Orion Constellation|accessdate=July 09, 2020|publisher=constellation-guide}}</ref> The two stars along with [[Lamda Orionis]] are situated in a red [[emission nebula]] designated Sh2-264.<ref>{{cite web|url=https://www.sciencephoto.com/media/329774/view/ccd-optical-image-of-nebula-around-lambda-orionis|title=CCD optical image of nebula around Lambda Orionis|accessdate=July 09, 2020|publisher=sciencephoto.com}}</ref>
Phi-1 Orionis is located nine times further away from [[Earth]] than Phi-2 Orionis at a distance of 1087.21 [[light year]]s.<ref name=universeguide/> The star is significantly larger than the [[Sun]] with a mass of 14 [[solar mass]]es and a radius 6.9 times larger than Sol's.<ref name=illinois/> Its extrodinarily high surface temperature of 28,900 kelvin means it radiates vast quantities of radiation in the [[ultraviolet]] portion of the [[electromagnetic spectrum]]. It also constributes to Phi-1 Orionis' high luminosity of 29,650 times larger than the Sun's.<ref name=illinois/> It's equator rotates at 28 kilometers per second, or equivalently the star rotates with a period of just under 12.3 days, fairly slow compared to most stars. The star is known from [[spectroscopy]] to have a companion star, making it a [[binary star|binary system]].<ref>
{{cite journal
|last1=Struve |first1=O.
|last2= |first2=
|last3= |first3=
|last4= |first4=
|last5= |first5=
|last6= |first6=
|last7= |first7=
|last8= |first8=
|last9= |first9=
|display-authors=3
|title=Preliminary orbit of the long-period spectroscopic binary 37 phi-1 Orionis.
|journal=Astrophysical Journal
|volume=63
|issue=|page=60-66|date=1926
|doi=10.1086/142950
|bibcode=1926ApJ....63...60S
|ref=harv
}}
</ref> They [[orbit]] each other with a period of 8.4 years and an orbital seperation of 10 [[Astronomical Unit]]s.<ref name=illinois/>
==Phi-2 Orionis==
Phi-2 Orionis ([[Flamsteed deignation]] 40 Orionis) is a [[hypergiant star]] and is situated much closer than Phi-1 Orionis, at around 117.48 light years.<ref>{{cite web|url=http://informationaboutstars.com/starinfo.dc/star/id-112958/|title=φ Orionis|accessdate=July 09, 2020|publisher=informationaboutstars.com}}</ref><ref>{{cite web|url=https://theskylive.com/sky/stars/phi2-orionis-star|title=φ2 Orionis (phi2 Orionis)|accessdate=July 09, 2020|publisher=theskylive.com}}</ref> It is slightly brighter in the night sky than its counterpart at magnitude +4.1 as it is much closer; intrinsically it is only 34.8 times brighter than the Sun.<ref>{{cite web|url=https://www.universeguide.com/star/26366/phi2orionis|title=Phi2 Orionis (40 Orionis) Star Facts|accessdate=July 09, 2020|publisher=universeguide.com}}</ref> It is 6.95 times the size of the Sun and has a surface temperature of 4,948 Kelvin.
==References==
{{reflist}}
{{Stars}}
[[Category:Astronomy]]
[[Category:Stars]]