Changes

| parallax        =3.00 ± 0.25 mas<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, designated Phi-1 Orion and Phi-2 Orion (sometimes written with [[superscript]]s as Phi¹ Orionis and Phi² Orionis.)<ref>{{cite web|url=http://www.glyphweb.com/esky/stars/phi1orionis.html|title=Phi1 Orionis|accessdate=July 09, 2020|publisher=glyphweb.com}}</ref> They are separated 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> Here we mainly consider Phi-1 Orion.

'''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, designated Phi-1 Orion and Phi-2 Orion (sometimes written with [[superscript]]s as Phi¹ Orionis and Phi² Orionis.)<ref>{{cite web|url=http://www.glyphweb.com/esky/stars/phi1orionis.html|title=Phi1 Orionis|accessdate=July 09, 2020|publisher=glyphweb.com}}</ref> They are separated 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 [[Lambda 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> Here we mainly consider Phi-1 Orion.

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 extraordinarily high surface temperature of 28,900 kelvin means it radiates vast quantities of radiation in the [[ultraviolet]] portion of the [[electromagnetic spectrum]]. It also contributes 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>

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 extraordinarily high surface temperature of 28,900 kelvin means it radiates vast quantities of radiation in the [[ultraviolet]] portion of the [[electromagnetic spectrum]]. It also contributes 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>