<Table> List of the largest stars <Tr> <Th> Star name </Th> <Th> Solar radii ( Sun = 1 ) </Th> <Th> Method </Th> <Th> Notes </Th> </Tr> <Tr> <Td> Orbit of Saturn </Td> <Td> 1,940 -- 2,169 </Td> <Td> </Td> <Td> Reported for reference </Td> </Tr> <Tr> <Td> UY Scuti </Td> <Td> 1,708 ± 192 </Td> <Td> AD </Td> <Td> The quoted size was based on an angular diameter and distance of 2.9 kpc . Gaia Data Release 2 suggests a much closer distance and consequently smaller radius . </Td> </Tr> <Tr> <Td> WOH G64 </Td> <Td> 1,540 -- 1,730 </Td> <Td> L / T </Td> <Td> This would be the largest star in the LMC , but is unusual in position and motion and might still be a foreground halo giant . </Td> </Tr> <Tr> <Td> RW Cephei </Td> <Td> 1,535 </Td> <Td> L / T </Td> <Td> RW Cep is variable both in brightness ( by at least a factor of 3 ) and spectral type ( observed from G8 to M ) , thus probably also in diameter . Because the spectral type and temperature at maximum luminosity are not known , the quoted size is just an estimate . </Td> </Tr> <Tr> <Td> Westerlund 1 - 26 </Td> <Td> 1,530 -- 1,580 ( -- 2,550 ) </Td> <Td> L / T </Td> <Td> Very uncertain parameters for an unusual star with strong radio emission . The spectrum is variable but apparently the luminosity is not . </Td> </Tr> <Tr> <Td> HD 143183 </Td> <Td> 1,480 -- 1,830 </Td> <Td> L / T </Td> <Td> </Td> </Tr> <Tr> <Td> VY Canis Majoris </Td> <Td> 1,420 ± 120 </Td> <Td> AD </Td> <Td> The size of VY CMa was revised in 2012 through newly improved measurements which result this value being the highest among well - characterized stars . Other stars could be larger but they could have less accurate radius estimates . </Td> </Tr> <Tr> <Td> KY Cygni </Td> <Td> 1,420 -- 2,850 </Td> <Td> L / T </Td> <Td> The upper estimate is due to an unusual K - band measurement and thought to be an artifact of a reddening correction error , and is thought to be against stellar evolutionary theory . The lower estimate is consistent with other stars in the same survey and with theoretical models . </Td> </Tr> <Tr> <Td> AH Scorpii </Td> <Td> 1,411 ± 124 </Td> <Td> AD </Td> <Td> AH Sco is variable by nearly 3 magnitudes in the visual range , and an estimated 20 % in total luminosity . The variation in diameter is not clear because the temperature also varies . </Td> </Tr> <Tr> <Td> RSGC1 - F02 </Td> <Td> 1,398 </Td> <Td> L / T </Td> <Td> </Td> </Tr> <Tr> <Td> IRAS 04509 - 6922 </Td> <Td> 1,360 </Td> <Td> L / T </Td> <Td> </Td> </Tr> <Tr> <Td> RSGC1 - F01 </Td> <Td> 1,335 </Td> <Td> L / T </Td> <Td> </Td> </Tr> <Tr> <Td> HR 5171 A </Td> <Td> 1,315 ± 260 , 1,575 ± 400 </Td> <Td> AD </Td> <Td> HR 5171 A is a highly distorted star in a close binary system , losing mass to the secondary , and is also variable in temperature , thus probably also in diameter . Traditionally , it is considered as the largest known yellow hypergiant , although the latest research suggests it is a red supergiant with a radius of 1,490 ± 540 R . </Td> </Tr> <Tr> <Td> SMC 18136 </Td> <Td> 1,310 </Td> <Td> </Td> <Td> Largest star in the Small Magellanic Cloud </Td> </Tr> <Tr> <Td> IRAS 05280 - 6910 </Td> <Td> 1,260 - 1,738 </Td> <Td> L / T </Td> <Td> </Td> </Tr> <Tr> <Td> Mu Cephei ( Herschel 's `` Garnet Star '' ) </Td> <Td> 1,260 </Td> <Td> </Td> <Td> Prototype of the obsolete class of the Mu Cephei variables and also the reddest star in the night sky in terms of the B-V color index . Other recent estimates range from 650 R to 1,420 R </Td> </Tr> <Tr> <Td> LMC 136042 </Td> <Td> 1,240 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> BI Cygni </Td> <Td> 1,240 </Td> <Td> L / T </Td> <Td> </Td> </Tr> <Tr> <Td> Westerlund 1 - 237 </Td> <Td> 1,233 </Td> <Td> L / T </Td> <Td> </Td> </Tr> <Tr> <Td> SMC 5092 </Td> <Td> 1,220 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> S Persei </Td> <Td> 1,212 ± 124 </Td> <Td> AD & L / T </Td> <Td> A red hypergiant localed in the Perseus Double Cluster . A large radius of 1,230 R is due to an unusual K - band measurement and thought to be an artifact of a reddening correction error . A small radius
<Table> List of the largest stars <Tr> <Th> Star name </Th> <Th> Solar radii ( Sun = 1 ) </Th> <Th> Method </Th> <Th> Notes </Th> </Tr> <Tr> <Td> Orbit of Saturn </Td> <Td> 1,940 -- 2,169 </Td> <Td> </Td> <Td> Reported for reference </Td> </Tr> <Tr> <Td> UY Scuti </Td> <Td> 1,708 ± 192 </Td> <Td> AD </Td> <Td> The quoted size was based on an angular diameter and distance of 2.9 kpc . Gaia Data Release 2 suggests a much closer distance and consequently smaller radius . </Td> </Tr> <Tr> <Td> WOH G64 </Td> <Td> 1,540 -- 1,730 </Td> <Td> L / T </Td> <Td> This would be the largest star in the LMC , but is unusual in position and motion and might still be a foreground halo giant . </Td> </Tr> <Tr> <Td> RW Cephei </Td> <Td> 1,535 </Td> <Td> L / T </Td> <Td> RW Cep is variable both in brightness ( by at least a factor of 3 ) and spectral type ( observed from G8 to M ) , thus probably also in diameter . Because the spectral type and temperature at maximum luminosity are not known , the quoted size is just an estimate . </Td> </Tr> <Tr> <Td> Westerlund 1 - 26 </Td> <Td> 1,530 -- 1,580 ( -- 2,550 ) </Td> <Td> L / T </Td> <Td> Very uncertain parameters for an unusual star with strong radio emission . The spectrum is variable but apparently the luminosity is not . </Td> </Tr> <Tr> <Td> HD 143183 </Td> <Td> 1,480 -- 1,830 </Td> <Td> L / T </Td> <Td> </Td> </Tr> <Tr> <Td> VY Canis Majoris </Td> <Td> 1,420 ± 120 </Td> <Td> AD </Td> <Td> The size of VY CMa was revised in 2012 through newly improved measurements which result this value being the highest among well - characterized stars . Other stars could be larger but they could have less accurate radius estimates . </Td> </Tr> <Tr> <Td> KY Cygni </Td> <Td> 1,420 -- 2,850 </Td> <Td> L / T </Td> <Td> The upper estimate is due to an unusual K - band measurement and thought to be an artifact of a reddening correction error , and is thought to be against stellar evolutionary theory . The lower estimate is consistent with other stars in the same survey and with theoretical models . </Td> </Tr> <Tr> <Td> AH Scorpii </Td> <Td> 1,411 ± 124 </Td> <Td> AD </Td> <Td> AH Sco is variable by nearly 3 magnitudes in the visual range , and an estimated 20 % in total luminosity . The variation in diameter is not clear because the temperature also varies . </Td> </Tr> <Tr> <Td> RSGC1 - F02 </Td> <Td> 1,398 </Td> <Td> L / T </Td> <Td> </Td> </Tr> <Tr> <Td> IRAS 04509 - 6922 </Td> <Td> 1,360 </Td> <Td> L / T </Td> <Td> </Td> </Tr> <Tr> <Td> RSGC1 - F01 </Td> <Td> 1,335 </Td> <Td> L / T </Td> <Td> </Td> </Tr> <Tr> <Td> HR 5171 A </Td> <Td> 1,315 ± 260 , 1,575 ± 400 </Td> <Td> AD </Td> <Td> HR 5171 A is a highly distorted star in a close binary system , losing mass to the secondary , and is also variable in temperature , thus probably also in diameter . Traditionally , it is considered as the largest known yellow hypergiant , although the latest research suggests it is a red supergiant with a radius of 1,490 ± 540 R . </Td> </Tr> <Tr> <Td> SMC 18136 </Td> <Td> 1,310 </Td> <Td> </Td> <Td> Largest star in the Small Magellanic Cloud </Td> </Tr> <Tr> <Td> IRAS 05280 - 6910 </Td> <Td> 1,260 - 1,738 </Td> <Td> L / T </Td> <Td> </Td> </Tr> <Tr> <Td> Mu Cephei ( Herschel 's `` Garnet Star '' ) </Td> <Td> 1,260 </Td> <Td> </Td> <Td> Prototype of the obsolete class of the Mu Cephei variables and also the reddest star in the night sky in terms of the B-V color index . Other recent estimates range from 650 R to 1,420 R </Td> </Tr> <Tr> <Td> LMC 136042 </Td> <Td> 1,240 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> BI Cygni </Td> <Td> 1,240 </Td> <Td> L / T </Td> <Td> </Td> </Tr> <Tr> <Td> Westerlund 1 - 237 </Td> <Td> 1,233 </Td> <Td> L / T </Td> <Td> </Td> </Tr> <Tr> <Td> SMC 5092 </Td> <Td> 1,220 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> S Persei </Td> <Td> 1,212 ± 124 </Td> <Td> AD & L / T </Td> <Td> A red hypergiant localed in the Perseus Double Cluster . A large radius of 1,230 R is due to an unusual K - band measurement and thought to be an artifact of a reddening correction error . A small radius
which is the largest sun in the universe
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UY Scuti
UY Scuti