Changes

| parallax        =0.2357 ± 0.0944 mas<ref name=simbad/><ref name=Gaia/>

| parallax        =0.2357 ± 0.0944 mas<ref name=simbad/><ref name=Gaia/>

}}

}}

'''RW Cephei''' (Rw Cep, HD 21246, HIP 110504) is a [[Supergiant|supergiant star]] in the [[constellation]] of [[Cepheus]].<ref name=universeguide/> It is not part of the constellation itself, but does lie within the borders of Cepheus. The star is one of the largest stars known with a radius nearly 1,600 greater than the [[Sun]]'s.<ref name=space.com>{{cite web|url=https://www.space.com/41290-biggest-star.html|title=What Is the Biggest Star?|accessdate=June 22, 2020|publisher=space.com|author=Nola Taylor Redd|date=July 26, 2018}}</ref> The star is sufficiently bright that it does not require [[binocular]]s or a [[telescope]] to observe it.

'''RW Cephei''' (Rw Cep, HD 21246, HIP 110504) is a [[Supergiant|supergiant star]] in the [[constellation]] of [[Cepheus]].<ref name=universeguide/> It is not part of the constellation itself, but does lie within the borders of Cepheus. The star is one of the largest stars known with a radius nearly 1,600 greater than the [[Sun]]'s.<ref name=space.com>{{cite web|url=https://www.space.com/41290-biggest-star.html|title=What Is the Biggest Star?|accessdate=June 22, 2020|publisher=space.com|author=Nola Taylor Redd|date=July 26, 2018}}</ref> The star is sufficiently bright that it does not require [[binoculars]] or a [[telescope]] to observe it.

RW Cephei is situated roughly 4026.71 [[light year]]s from [[Earth]].<ref name=universeguide/> The star is truly huge, thought to have a radius of 1,535 [[solar radii]] and a mass of 13.7 [[solar mass]]es.<ref name=space.com/> The temperature of the star is thought to be low at 590&nbsp;kelvin.<ref name=universeguide/> The prefix "RV" in the name identifies RW Cephei as a [[variable star]], meaning its brightness changes over time. It is classified as a pulsating, slow regular variable. The Star slowly expands and contracts over time in a reggular and predictable manner. As it does so, the brightness varies between +6.456 and +6.620 over a period of 0.170&nbsp;days or four hours.<ref name=universeguide/><ref>{{cite web|url=https://www.universeguide.com/fact/irregularsemiregular#slow|title=Irregular and Semi-Regular Variable Stars|accessdate=June 22, 2020|publisher=universeguide.com}}</ref>

RW Cephei is situated roughly 4026.71 [[light year]]s from [[Earth]].<ref name=universeguide/> The star is truly huge, thought to have a radius of 1,535 [[solar radii]] and a mass of 13.7 [[solar mass]]es.<ref name=space.com/> The temperature of the star is thought to be low at 590&nbsp;kelvin.<ref name=universeguide/> The prefix "RV" in the name identifies RW Cephei as a [[variable star]], meaning its brightness changes over time. It is classified as a pulsating, slow regular variable. The Star slowly expands and contracts over time in a regular and predictable manner. As it does so, the brightness varies between +6.456 and +6.620 over a period of 0.170&nbsp;days or four hours.<ref name=universeguide/><ref>{{cite web|url=https://www.universeguide.com/fact/irregularsemiregular#slow|title=Irregular and Semi-Regular Variable Stars|accessdate=June 22, 2020|publisher=universeguide.com}}</ref>

The star is not known to have any [[exoplanet]]s.

The star is not known to have any [[exoplanet]]s.