List of largest stars

Wikimedia list article
Size comparison of stars.
A quasi-star compared to many large stars (UY Scuti is smaller than VY Canis Majoris).

Below is a list of the largest stars so far discovered, ordered by radius. The unit of measurement used is the radius of the Sun (696,392 km; 432,717.927 mi).

Note: This list is not perfectly defined. The sizes of the largest stars are best estimates, and may get revised.

A few stars are in the Zodiac, and the Moon sometimes passes in front of them. This allows calculating their size by their angular size and distance. This is not very reliable. Most do not, so astronomers calculate their size by their spectral type (which gives their luminosity), distance, and brightness. This is even less reliable.


List of the largest stars
Star name Solar radii
(Sun = 1)
Method[a] Notes
Protostars ~20,000 Protostars are fragments of gas and dust that are beginning to form new stars that will be powered by nuclear fusion. They would be the size of the planetary solar system.
Quasi-stars 7,720[1] A hypothetical type of primordial star containing a black hole at its core; the black hole consuming material would be the source of its energy. They are hypothesized to have been the origin of many galaxies, including the Milky Way, and their supermassive black holes.
VY Canis Majoris 1,800–2,100[2][3] L/Teff Candidate for the largest known star.[4] Once thought to be 3,000 R, making it outside of stellar evolutionary theory. Improved measurements have brought it down to size (see below).[5][2]
Orbit of Saturn 1,940–2,169 Reported for reference
VV Cephei A 1,900[6] VV Cep A is a highly distorted star in a close binary system, losing mass to the secondary for at least part of its orbit. It is probably the largest star visible to the naked eye.
MY Cephei 1,750[7] L/Teff
UY Scuti 1,708 ± 192[8] AD Margin of error in size determination: ±192 R. At the smallest, it would have a size smaller than Westerlund 1-26 (see below).
NML Cygni 1,640–2,770[9] L/Teff De beck et al. 2010 calculates 1,183 R,[10] although the quoted sizes were based on a more accurate measure of its distance combined with assumptions of its temperature.
VX Sagittarii 1,550[11] L/Teff VX Sgr is a pulsating variable with a large visual range and varies significantly in size from 1,120 R[11] to 1,940 R[12].
WOH G64 1,540±5%[13] (–1,730[14]) L/Teff This would be the largest star in the LMC, but is unusual in position and motion and might still be a foreground halo giant.
RW Cephei 1,535 [15][16] L/Teff 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. A radius of 981 R for 5,018 K or 1,758 R for 3,749 K.[17][15]
Westerlund 1-26 1,530-1,580[18] (–2,550) [19] L/Teff Very uncertain parameters for an unusual star with strong radio emission. The spectrum is variable but apparently the luminosity is not.
RSGC1-F02 1,498[20] L/Teff
HD 143183 1,480[21]
RSGC1-F01 1,435[20] L/Teff
KY Cygni 1,420–2,850 [6] L/Teff 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.
VY Canis Majoris[5] 1,420 ± 120[5] AD Based on Wittkowski et al model through a newly improved measurement although there is still considerable variation in estimates. Reported for reference
Mu Cephei (Herschel's "Garnet Star") 1,420[6] Mu Cep is the prototype of the old class of the Mu Cephei variables (now called a semiregular variable).
AH Scorpii 1,411 ± 124[8] AD 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.
IRAS 04509-6922 1,360[22] L/Teff
HV 888 1,353[23] L/Teff
HR 5171 A 1,315 ± 260,[24] 1,575 ± 400[25] AD 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 size.[26] Traditionally, it is considered as the largest known yellow hypergiant (maybe an early K-type class),[27] although the latest research suggests it is a red supergiant with a slightly larger size of 1,490 ± 540 R.[28]
SMC 18136 1,310[29] This would be the largest star in the SMC.
J004424.94+412322.3 1,300[30] L/Teff Localed in the Andromeda Galaxy
PZ Cassiopeiae 1,260-1,340,[31] 1,190-1,940[6] L/Teff The largest estimate is due to an unusual K band measurement and thought to be an artifact of a reddening correction error. The lowest estimate is consistent with other stars in the same survey and with theoretical models, and the intermediate ones have been obtained refining the distance to this star, and thus its parameters.
IRAS 5280-6910 1,260[22] L/Teff
WOH S341 1,258[23] L/Teff
LMC 136042 1,240[29]
BI Cygni 1,240[6] L/Teff Mauron et al. 2011 derive 123,000 L, which implies a size around 916 R.[32]
Westerlund 1-237 1,233[19] L/Teff
SMC 5092 1,220[29]
S Persei 1,212 ± 124[33] AD & L/Teff 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 of 780 R is consistent with other stars in the same survey and with theoretical models.[6]
LMC 175464 1,200[29]
LMC 135720 1,200[29]
IRC-10414(RAFGL 2139) 1,200[34] RAFGL 2139 is a rare red supergiant companion to WR 114 that has a bow shock.
SMC 69886 1,190[29]
RSGC1-F05 1,177[20] L/Teff
EV Carinae 1,168[23]-2,880[35] L/Teff
RSGC1-F03 1,168[20] L/Teff
LMC 119219 1,150[29]
RSGC1-F08 1,146[20] L/Teff
BC Cygni 1,140[6]-1,230[36] L/Teff Other recent estimates range from 856 R to 1,553 R.[37]
J004035.08+404522.3 1,130[30] L/Teff Localed in the Andromeda Galaxy
SMC 10889 1,130[29]
LMC 141430 1,110[29]
IRAS 04516-6902 1,100[22] L/Teff
LMC 175746 1,100[29]
RSGC1-F13 1,098[20] L/Teff
RT Carinae 1,090[6] L/Teff
Stephenson 2-18 1,086[38]–2,150[19] L/Teff
RSGC1-F04 1,082[20] L/Teff
LMC 174714 1,080[29]
LMC 68125 1,080[29]
SMC 49478 1,080[29]
SMC 20133 1,080[29]
Stephenson 2-49 1,074[38] L/Teff
V396 Centauri 1,070[6] L/Teff
SMC 8930 1,070[29]
Orbit of Jupiter 1,064–1,173 Reported for reference
HV 11423 1,060–1,220[39] L/Teff HV 11423 is variable in spectral type (observed from K0 to M5), thus probably also in diameter. In October 1978, it was a star of M0I type.
CK Carinae 1,060[6] L/Teff
SMC 25879 1,060[29]
LMC 142202 1,050[29]
LMC 146126 1,050[29]
LMC 67982 1,040[29]
U Lacertae 1,022[32][40] L/Teff
RSGC1-F11 1,015[20] L/Teff
W Persei 1,011[19] L/Teff
LMC 143877 1,010[29]
KW Sagittarii 1,009[8]-1,460[6] AD & L/Teff Margin of possible error: ±142 R.[8]
RSGC1-F12 1,005[19] L/Teff
SMC 46497 990[29]
LMC 140296 990[29]
RSGC1-F09 986[20] L/Teff
NR Vulpeculae 980[6] L/Teff
SMC 12322 980[29]
LMC 177997 980[29]
SMC 59803 970[29]
Westerlund 1-20 965[19] L/Teff
GCIRS 7 960[41]–1,000[42] AD At the galactic center. Margin of possible error: ±92 R[41] or ±150 R[42].
HV 2561 957[23] L/Teff
Betelgeuse (Alpha Orionis) 955 ± 217[43] AD Other recent estimates range from 887 ± 203 R[44] to 1,180 R[45]
SMC 50840 950[29]
HV 916 944[23] L/Teff
RSGC1-F10 931[20] L/Teff
S Cassiopeiae 930[46][47]
IX Carinae 920[6] L/Teff
HV 2112 916[48] L/Teff Most likely candidate for a Thorne-Zytkow Object, although it may simply be an S-type, a red supergiant, or possibly a very luminous AGB star.
RSGC1-F07 910[20] L/Teff
LMC 54365 900[29]
IRAS 04498-6842 900[49]-1,660[22] L/Teff
HV 996 894[23] L/Teff
NSV 25875 891[10] L/Teff
LMC 109106 890[29]
HV 12501 890[23] L/Teff
RSGC1-F06 885[20] L/Teff
Stephenson 2-03 883[38]–969[19] L/Teff
LMC 116895 880[29]
SMC 30616 880[29]
LMC 64048 880[29]
IRAS 05558-7000 880[22] L/Teff
J013508.78+303639.9 874 L/Teff A yellow hypergiant localed in the Triangulum Galaxy.
V437 Scuti 874[10] L/Teff
IRAS 04407-7000 870[22] L/Teff
IRAS 05329-6708 870[22] L/Teff
HV 986 867[23] L/Teff
V602 Carinae 860[6]-1,050[50] L/Teff & AD Margin of possible error: ±165 R.[50]
J004047.82+410936.4 860[30] L/Teff Localed in the Andromeda Galaxy
J004428.71+420601.6 860[30] L/Teff Localed in the Andromeda Galaxy
V669 Cassiopeiae 859[10] L/Teff
HV 2360 857[23] L/Teff
HV 5870 856[23] L/Teff
SMC 55681 850[29]
SMC 15510 850[29]
LMC 61753 830[29]
LMC 62090 830[29]
SMC 11709 830[29]
V1185 Scorpii 830[10] L/Teff
AD Persei 812[19] L/Teff
LMC 142199 810[29]
IRAS 05294-7104 810[22] L/Teff
IRAS 05402-6956 800[22] L/Teff
LMC 134383 800[29]
J013508.78+303639.9 799 L/Teff A yellow hypergiant localed in the Triangulum Galaxy.
V441 Persei 799[19] L/Teff
BU Persei 795[19] L/Teff
IRAS 05298-6957 790[22] L/Teff
BO Carinae 790[6] L/Teff
LMC 142907 790[29]
J004359.94+411330.9 785[30] L/Teff Localed in the Andromeda Galaxy
SU Persei 780[6] L/Teff In the Perseus Double Cluster
RS Persei 770[51]-1,000[6] AD & L/Teff In the Perseus Double Cluster. Margin of possible error: ±30 R.[51]
AV Persei 770[6] L/Teff In the Perseus Double Cluster
V355 Cepheus 770[6] L/Teff Mauron et al. 2011 derive 37,000 L, which implies a size around 300 R.[32]
J004124.80+411634.7 760[30] L/Teff Localed in the Andromeda Galaxy
V915 Scorpii 760[52][53] L/Teff
S Cephei 760[54] AD
YZ Persei 758[19] L/Teff
J004447.08+412801.7 755[30] L/Teff Localed in the Andromeda Galaxy
GP Cassiopeiae 751[19] L/Teff
Outer limits of the asteroid belt 750–900 Reported for reference
SMC 11939 750[29]
HD 303250 750[6] L/Teff
V382 Carinae 747[55] The brightest yellow hypergiant in the night sky, one of the rarest types of star. Achmad et al. 1992 calculates 600 R to 1,100 R or 700 ± 250 R.[56]
Stephenson 2-23 743[38] L/Teff
RU Virginis 740[57] L/Teff
LMC 137818 740[29]
SMC 48122 740[29]
Stephenson 2-09 736[38] L/Teff
IRAS 04545-7000 730[22] L/Teff
IRAS 05003-6712 730[22] L/Teff
SMC 56732 730[29]
KK Persei 724[19] L/Teff
V648 Cassiopeiae 710[6] L/Teff
XX Persei 710[58] L/Teff Located in the Perseus Double Cluster and near the border with Andromeda.
Stephenson 2-04 710[19] L/Teff
TV Geminorum 620-710[59] (–770)[6] L/Teff
Mercer 8-06 708[19] L/Teff
HD 179821 704[60] A yellow hypergiant, although most authors consider it as a supergiant, a protoplanetary nebula or a post-AGB star with a luminosity of only 16,000 L.
J004255.95+404857.5 700[30] L/Teff Localed in the Andromeda Galaxy
LMC 169754 700[29]
LMC 65558 700[29]
V528 Carinae 700[6] L/Teff
RSGC1-F14 700[20] L/Teff
The following well-known stars are listed for the purpose of comparison.
Pi1 Gruis 694 AD A red giant that contains giant bubbles on its surface.[61]
V354 Cephei 690[32]-1,520[6] L/Teff
Antares A (Alpha Scorpii A) 680[62] (vary by 165[63]) AD Antares A is red supergiant containing two spots on its surface.[64] Older estimates have given radii above 800 R,[65][66] but some are likely to have been affected by asymmetry of the atmosphere and the narrow range of infrared wavelengths observed.[62]
VY Canis Majoris[67] 600[67] L/Teff Based on Massey et al model, where the star would be a normal supergiant rather than a hypergiant, although most estimates give much larger sizes (see above). Reported for reference
CE Tauri 587–593[68] (–608[69]) AD Second reddest star in the night sky.[70] Can be occulted by the Moon, allowing accurate determination of its apparent diameter.
R Leporis (Hind's "Crimson Star") 400[71]–535[72] Margin of possible error: ±90 R.[71]
CW Leonis 500[73]–700[74] L/Teff CW Leonis is one of the mistaken identities as the claimed planet "Nibiru" or "Planet X", due to its brightness as it approaches 1st magnitude. Other estimates range from 390 R[73] to 826 R[10].
Rho Cassiopeiae 400-500[75] Yellow hypergiant, one of the rarest types of a star.
Mira A (Omicron Ceti) 332–402[76] AD Prototype Mira variable. De beck et al. 2010 calculates 541 R.[10]
HR 5171 Ab 312–401,[24] 650 ± 150[25] AD The yellow hypergiant companion of HR 5171 A.
V509 Cassiopeiae 400–900[77] Yellow hypergiant, one of the rarest types of a star.
Inner limits of the asteroid belt 380 Reported for reference
V838 Monocerotis 380 (in 2009)[78] A short time after the outburst V838 Mon was measured at 1,570 ± 400 R.[79] However the distance to this "L-type supergiant", and hence its size, have since been reduced and it proved to be a transient object that shrunk about four-fold over a few years. Like CW Leo, it has been erroneously portrayed as "Nibiru" or "Planet X" (see above).
S Doradus 100-380[80] Prototype S Doradus variable, even though P Cygni was the first discovered.
R Doradus 370 ± 50[81] Star with the second largest apparent size after the Sun.
Tail of Comet Hyakutake 360 Reported for reference
IRC +10420 357[82]–1,342[10] L/Teff A yellow hypergiant that has increased its temperature into the LBV range.
The Pistol Star 340[83] Blue hypergiant, among the most massive and luminous stars known.
La Superba (Y Canum Venaticorum) 307[10]-390[84] L/Teff Referred to as La Superba by Angelo Secchi. Currently one of the coolest and reddest stars.
Orbit of Mars 297–358 Reported for reference
Alpha Herculis (Ras Algethi) 284 ± 60[85] Moravveji et al. 2013 also gives a range from 264 R to 303 R. At an estimated distance of 110 pc and an angular diameter of 34 mas, this corresponds to a radius of 400 ± 61 R.[85]
Sun's red giant phase 256[86] The core hydrogen would be exhausted in 5.4 billion years. In 7.9 billion years, The Sun would reach the tip of the red-giant branch of the Hertzsprung–Russell diagram. (see below)
Reported for reference
Orbit of Earth 215 (211–219) Reported for reference
Deneb (Alpha Cygni) 203 ± 17[87] Prototype Alpha Cygni variable.
Solar System Habitable Zone 200–520[88] (uncertain) Reported for reference
Orbit of Venus 154–157 Reported for reference
Epsilon Aurigae A (Almaaz) 143-358[89] ε Aur was incorrectly claimed in 1970 as the largest star with a size between 2,000 R and 3,000 R,[90] even though it later turned out not to be an infrared light star but rather a dusk torus surrounding the system.
Peony Star 92[91] Candidate for most luminous star in the Milky Way.
Gamma Crucis 113[92] Closest red giant star to the Sun.
Rigel A (Beta Orionis A) 78.9[93]–115[94] Margin of possible error: ±7.4 R.[93]
Canopus (Alpha Carinae) 71 ± 4[95] Second brightest star in the night sky.
Orbit of Mercury 66–100 Reported for reference
Eta Carinae A (Tseen She) 60-800[96] Previously thought to be the most massive single star, but in 2005 it was realized to be a binary system. During the Great Eruption, it was 1,400 R.[97] Older estimates gives 85–195 R.[98]
LBV 1806-20 45–145[99] L/Teff Formerly a candidate for the most luminous star in the Milky Way with 40 million L,[100] but the luminosity has been revised later only 2-5 million L.[101][102]
Aldebaran (Alpha Tauri) 44.13 ± 0.84[103] AD
Polaris (Alpha Ursae Minoris) 37.5[104] The current northern pole star.
R136a1 28.8[105]–35.4[106] Also on record as the most massive and luminous star known (265 - 315 M and 8.71 million L).
Arcturus (Alpha Boötis) 25.4 ± 0.2[107] Brightest star in the northern hemisphere.
HDE 226868 20-22[108] The supergiant companion of black hole Cygnus X-1. The black hole is 500,000 times smaller than the star.
VV Cephei B 13[109]-25[110] The B-type main sequence companion of VV Cephei A.
Sun's helium burning phase 10 After the red-giant branch the Sun has approximately 120 million years of active life left.
Reported for reference
Sun 1 The largest object in the Solar System.
Reported for reference


  1. AD: radius determined from angular diameter and distance
    L/Teff: radius calculated from bolometric luminosity and effective temperature


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