List of largest stars
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).


Additional methods
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.
Caveats
These objects are extremely big, thousand to millions of times the volume of our Sun, and extremely luminous. These stars also have extended atmospheres and photospheres, and are often shrouded in dust (Like Stephenson 2-18, WOH G64 , UY Scuti and VY Canis Majoris). This makes their true size uncertain. Many of these stars vary in size and brightness (like Betelguese, Antares, UY Scuti and VY Canis Majoris).
These objects are also far away, sometimes intergalactic (eg: WOH G64 is in the Large Magellanic Cloud). This makes it even harder to calculate their sizes. Most stars found will not be above 1,500 times the Sun's radius. Their mass would hardly hold together, and a lot of material would be ejected by powerful solar winds, forming the nebulae we see around them.
List
Star name | Solar radii (Sun = 1) |
Method[lower-alpha 1] | Notes |
---|---|---|---|
Stephenson 2-18 (Stephenson 2 DFK 1) | 2,150[1] | L/Teff | Located in close proximity to the extremely massive open cluster Stephenson 2 (RSGC2), where 25 other red supergiants are also located; Likely the largest star known, although some stars are possibly larger.. |
Orbit of Saturn | 1,940-2,169 | Reported for reference | |
UY Scuti | 1,708 ± 192[2] | AD | The Gaia Data Release 2 directly measured UY Scuti and got a radius of 755 R☉ respectively. However, the Gaia parallax might be unreliable due to a very high level of astrometric noise. |
WOH G64 | 1,540-1,730[3] | L/Teff | Located in the Large Magellanic Cloud |
The sizes above may not be correct because theories say stars cannot be larger than 1,500 R☉.[4] | |||
RSGC1-F02 | 1,499[5]-1,549[1] | L/Teff | Located in the massive open cluster RSGC1. |
HV 888 (WOH S140) | 1,477-1,974[6] | L/Teff | Located in the Large Magellanic Cloud. An older estimate suggests a smaller size of 1,353 R☉[7] |
RSGC1-F01 | 1,435[5]-1,551[1] | L/Teff | Located in the massive open cluster RSGC1. |
VY Canis Majoris | 1,420[8] | AD | VY CMa is described as the largest star in the Milky Way although galactic red supergiants above are possibly larger but they have less accurate radius estimates.[9] Older estimates originally estimated the radius of VY CMa to be above 3,000 R☉,[10] or as little as 600 R☉.[11] The 1,420 R☉ measure has a margin of error of ±120 R☉.[8] |
KY Cygni | 1,420[4] | L/Teff | |
AH Scorpii | 1,411[2] | AD | AH Sco is a 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. |
WOH S281 | 1,376[6] | L/Teff | |
IRAS 05280-6910 (LMC 582) | 1,367-1,738[12] | L/Teff | Located in the Large Magellanic Cloud |
IRAS 04509-6922 | 1,360[13] | L/Teff | Located in the Large Magellanic Cloud |
PHL 293B | 1,348[14] | This star, a blue supergiant, may not exist anymore. | |
W Cephei | 1,320[15] | AD | |
SMC 18136 | 1,310[16] | L/Teff | Located in the Small Magellanic Cloud. |
V774 Sagittarii | 1,310[15] | AD | |
WOH S279 | 1,298[6] | L/Teff | |
SW Cephei | 1,298[15] | AD | |
RW Cygni | 1,273[15] | AD | |
SP77 46-44 (WOH S341) | 1,258[7] | L/Teff | Located in the Large Magellanic Cloud |
Westerlund 1-237 | 1,245[1] | L/Teff | Red supergiant within the Westerlund 1 super star cluster. |
HV 2255 (WOH S97) | 1,235[6] | L/Teff | |
SMC 5092 | 1,220[16] | L/Teff | |
SP77 31-18 (WOH S72) | 1,211[6] | L/Teff | |
IRC -10414 | 1,200[17] | L/Teff | IRC -10414 is a rare red supergiant companion to WR 114 that has a bow shock. |
LMC 175464 | 1,200[16] | L/Teff | Located in the Large Magellanic Cloud. |
LMC 135720 | 1,200[16] | L/Teff | Located in the Large Magellanic Cloud |
Betelgeuse (Alpha Orionis) | 1,200 | AD | with new data Betelgeuse is said to be 1,200 solar radii more infomation here |
SMC 69886 | 1,190[16] | L/Teff | |
NML Cygni | 1,183[18] | L/Teff | NML Cyg is calculated to be between 1,640 R☉ and 2,770 R☉ based on a more accurate measure of its distance combined with assumptions of its temperature.[19] |
HD 90587 | 1,181[15] | AD | |
RSGC1-F03 | 1,168[5]-1,326[1] | L/Teff | Located in the massive open cluster RSGC1. |
EV Carinae | 1,168[7] | L/Teff | Older estimates based on much larger distances have given higher luminosities, and consequently larger radii.[20][21] |
Westerlund 1-26 | 1,165 or 1,221[22] | L/Teff | Very uncertain parameters for an unusual star with strong radio emission. The spectrum is variable but apparently the luminosity is not. |
LMC 119219 | 1,150[16] | L/Teff | Located in the Large Magellanic Cloud |
WOH S264 | 1,149[6] | L/Teff | |
HD 143183 (V558 Normae) | 1,147[23] | AD | |
V602 Carinae | 1,142[15] | AD | |
MY Cephei | 1,135[24] | L/Teff | Not to be confused with Mu Cephei (see above). Older estimates have given up to 2,440 R☉ based on much cooler temperatures.[25] |
HV 2561 | 1,133[6] | L/Teff | Located in the Large Magellanic Cloud |
J004035.08+404522.3 | 1,130-1,230[26] | L/Teff | Located in the Andromeda Galaxy |
LMC 17338 | 1,122[6] | L/Teff | |
VX Sagittarii | 1,120-1,550[27] | L/Teff | VX Sgr is a pulsating variable with a large visual range and is calculated to vary in size from 1,350 R☉ to 1,940 R☉.[28] |
HR 5171 Aa | 1,060-1,160[29] | AD | HR 5171 A is a highly distorted star in a close binary system, losing mass to the secondary. It is also variable in temperature, thus probably also in diameter. Other estimates range from 1,315 ± 260 solar radii to 1,490 ± 540 solar radii. |
LMC 141430 | 1,110[16] | L/Teff | Located in the Large Magellanic Cloud |
S Persei | 1,109[1] | L/Teff | A red supergiant located in the Perseus Double Cluster. Levsque et al. 2005 calculated radii of 780 R☉ and 1,230 R☉ based on K-band measurements.[4] Older estimates gave up to 2,853 R☉ based on higher luminosities.[21] |
IRAS 04516-6902 | 1,100[13] | L/Teff | Located in the Large Magellanic Cloud |
LMC 175746 | 1,100[16] | L/Teff | Located in the Large Magellanic Cloud |
ST Cephei | 1,100[15] | AD | |
RSGC1-F08 | 1,088[1]-1,146[5] | L/Teff | Located in the massive open cluster RSGC1. |
HV 11423 | 1,086[6] | 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. |
HV 2084 | 1,084[6] | L/Teff | |
LMC 174714 | 1,080[16] | L/Teff | Located in the Large Magellanic Cloud |
LMC 68125 | 1,080[16] | L/Teff | Located in the Large Magellanic Cloud |
SMC 49478 | 1,080[16] | L/Teff | |
SMC 20133 | 1,080[16] | L/Teff | |
Trumpler 27-1 | 1,073[30] | L/Teff | |
SMC 8930 | 1,070[16] | L/Teff | |
V366 Andromedae | 1,067[15] | AD | |
Orbit of Jupiter | 1,064-1,173 | Reported for reference | |
PZ Cassiopeiae | 1,062[30] | L/Teff | |
SMC 25879 | 1,060[16] | L/Teff | |
IM Cassiopeiae | 1,059[15] | AD | |
LMC 136042 | 1,051[6] | L/Teff | Located in the Large Magellanic Cloud |
LMC 142202 | 1,050[16] | L/Teff | Located in the Large Magellanic Cloud |
LMC 146126 | 1,050[16] | L/Teff | Located in the Large Magellanic Cloud |
RSGC1-F05 | 1,047[1]-1,177[5] | L/Teff | Located in the massive open cluster RSGC1. |
SMC 10889 | 1,046[6] | L/Teff | |
LMC 67982 | 1,040[16] | L/Teff | Located in the Large Magellanic Cloud |
SU Persei | 1,039[15] | AD | In the Perseus Double Cluster |
HV 11262 | 1,030[6] | L/Teff | |
SMC 83593 | 1,019[6] | L/Teff | |
AS Cephei | 1,018[15] | AD | |
WOH S74 | 1,014[6] | L/Teff | |
W Persei | 1,011[1] | L/Teff | |
LMC 143877 | 1,010[16] | L/Teff | Located in the Large Magellanic Cloud |
HD 167861 | 1,007[15] | AD | |
RSGC1-F12 | 1,005[1] | L/Teff | Located in the massive open cluster RSGC1. |
BU Sagittarii | 1,005[15] | AD | |
RT Carinae | 995[15] | AD | |
RSGC1-F13 | 993[1]-1,098[5] | L/Teff | Located in the massive open cluster RSGC1. |
NO Aurigae | 991[15] | AD | |
SMC 46497 | 990[16] | L/Teff | |
LMC 140296 | 990[16] | L/Teff | Located in the Large Magellanic Cloud |
SMC 55188 | 988[6] | L/Teff | |
RSGC1-F09 | 986[5]-1,231[1] | L/Teff | Located in the massive open cluster RSGC1. |
NR Vulpeculae | 980[4] | L/Teff | |
SMC 12322 | 980[16] | L/Teff | |
LMC 177997 | 980[16] | L/Teff | Located in the Large Magellanic Cloud |
HV 2236 | 971[6] | L/Teff | |
SMC 59803 | 970[16] | L/Teff | |
Stephenson 2-03 | 969[1] | L/Teff | |
Westerlund 1-20 | 965[1] | L/Teff | Red supergiant within the Westerlund 1 super star cluster. |
V396 Centauri | 965[15] | AD | |
GCIRS 7 | 960[31]-1,000[32] | AD | Located at the galactic center. Margin of possible error: ±92 R☉[31] or ±150 R☉.[32] |
RSGC1-F11 | 955[1]-1,015[5] | L/Teff | Located in the massive open cluster RSGC1. |
V341 Lacertae | 953[15] | AD | |
HD 155737 | 951[15] | AD | |
SMC 50840 | 950[16] | L/Teff | |
HU Puppis | 950[15] | AD | |
HV 894 | 946[6] | L/Teff | |
J004424.94+412322.3 | 945-1,300[26] | L/Teff | Located in the Andromeda Galaxy. |
RM 1-361 | 933[6] | L/Teff | |
HV 916 | 932[6] | L/Teff | Located in the Large Magellanic Cloud |
RSGC1-F10 | 931[5]-954[1] | L/Teff | Located in the massive open cluster RSGC1. |
S Cassiopeiae | 930[33][34] | DSKE | |
WOH S71 | 926[6] | L/Teff | |
IX Carinae | 920[4] | L/Teff | |
HV 2112 | 916[35] | L/Teff | Most likely candidate for a Thorne-Żytkow object. |
RSGC1-F04 | 914[1]-1,082[5] | L/Teff | Located in the massive open cluster RSGC1. |
CK Carinae | 909[15] | AD | |
IRAS 04498-6842 | 900[36] | L/Teff | Located in the Large Magellanic Cloud |
LMC 54365 | 900[16] | L/Teff | Located in the Large Magellanic Cloud |
HV 996 | 894[7] | L/Teff | Located in the Large Magellanic Cloud |
NSV 25875 | 891[18] | L/Teff | |
LMC 1318 | 891[6] | L/Teff | Probably the largest AGB Star. |
HV 12501 | 890[7] | L/Teff | Located in the Large Magellanic Cloud |
LMC 109106 | 890[16] | L/Teff | Located in the Large Magellanic Cloud |
RSGC1-F06 | 885[5]-967[1] | L/Teff | Located in the massive open cluster RSGC1. |
Stephenson 2-11 | 884[1] | L/Teff | |
IRC -20412 | 882[15] | AD | |
IRAS 05558-7000 | 880[13] | L/Teff | Located in the Large Magellanic Cloud |
SMC 30616 | 880[16] | L/Teff | |
LMC 64048 | 880[16] | L/Teff | Located in the Large Magellanic Cloud |
V437 Scuti | 874[18] | L/Teff | |
IRAS 04407-7000 | 870[13] | L/Teff | Located in the Large Magellanic Cloud |
IRAS 05329-6708 | 870[13] | L/Teff | Located in the Large Magellanic Cloud |
SMC 46662 | 868[6] | L/Teff | |
HV 986 | 867[7] | L/Teff | Located in the Large Magellanic Cloud |
J004047.82+410936.4 | 860-1,010[26] | L/Teff | Located in the Andromeda Galaxy |
AZ Cygni | 861[15] | AD | |
AZ Cephei | 860[15] | AD | |
V669 Cassiopeiae | 859[18] | L/Teff | |
HV 2360 | 857[7] | L/Teff | Located in the Large Magellanic Cloud |
HV 5870 | 856[7] | L/Teff | Located in the Large Magellanic Cloud |
BI Cygni | 850[37]-1,240[4] | L/Teff | |
SMC 15510 | 850[16] | L/Teff | |
KW Sagittarii | 850[15] | AD | Older estimates have given larger radii and consequently cooler temperatures.[4] |
V358 Cassiopeiae | 848[15] | AD | |
BD-15 4915 | 841[15] | AD | |
UV Carinae | 840[15] | AD | |
WOH S60 | 836[6] | L/Teff | |
Mu Cephei (Herschel's "Garnet Star") | 830[38] | ||
V1185 Scorpii | 830[18] | L/Teff | |
LMC 61753 | 830[16] | L/Teff | Located in the Large Magellanic Cloud |
LMC 62090 | 830[16] | L/Teff | Located in the Large Magellanic Cloud |
CW Leonis | 826[18] | L/Teff | Prototype of carbon stars. CW Leo was mistakenly identified as the claimed planet "Nibiru" or "Planet X". |
VX Aurigae | 825[15] | AD | |
V353 Puppis | 824[15] | AD | |
UW Aquilae | 823[15] | AD | |
Stephenson 2-14 | 821[1] | L/Teff | |
BC Cygni | 820[30] | L/Teff | |
V362 Aurigae | 819[15] | AD | |
LMC 116895 | 814[6] | L/Teff | Located in the Large Magellanic Cloud |
LMC 142199 | 810[16] | L/Teff | Located in the Large Magellanic Cloud |
IRAS 05294-7104 | 810[13] | L/Teff | Located in the Large Magellanic Cloud |
PMMR 41 | 809[6] | L/Teff | |
HD 268850 | 808[6] | L/Teff | |
YZ Persei | 804[15] | AD | |
LMC 134383 | 802[6] | L/Teff | Located in the Large Magellanic Cloud |
IRAS 05402-6956 | 800[13] | L/Teff | Located in the Large Magellanic Cloud |
V441 Persei | 799[1] | L/Teff | |
PMMR 34 | 796[6] | L/Teff | |
BU Persei | 795[1] | L/Teff | |
BO Carinae | 790[4] | L/Teff | |
IRAS 05298-6957 | 790[13] | L/Teff | Located in the Large Magellanic Cloud |
LMC 142907 | 790[16] | L/Teff | Located in the Large Magellanic Cloud |
V641 Cassiopeiae | 788[15] | AD | |
HV 963 | 787[6] | L/Teff | |
6 Geminorum (BU Geminorum) | 787[15] | AD | |
U Lacertae | 785[30] | L/Teff | |
SMC 11709 | 781[6] | L/Teff | |
VV Cephei A | 779.27[39] | EB | 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. Data from the most recent eclipse has cast additional doubt on the accepted model of the system. Older estimates give up to 1,900 R☉ |
RS Persei | 770[40]-831[24] | AD & L/Teff | In the Perseus Double Cluster. Margin of possible error: ±30 R☉.[40] |
AV Persei | 770[4] | L/Teff | In the Perseus Double Cluster |
V355 Cephei | 770[4] | L/Teff | Mauron et al. 2011 derive 37,000 L☉, which implies a size around 300 R☉.[20] |
V517 Monocerotis | 768[15] | AD | |
HD 303250 | 766[15] | AD | |
PMMR 141 | 762[6] | L/Teff | |
HV 2551 | 762[6] | L/Teff | |
SMC 52334 | 761[6] | L/Teff | |
J004124.80+411634.7 | 760-1,240[26] | L/Teff | Located in the Andromeda Galaxy and has a possible hot companion. |
V915 Scorpii | 760[41][42] | L/Teff | |
S Cephei | 760[43] | AD | |
HD 95687 | 758[15] | AD | |
J004447.08+412801.7 | 755-825[26] | L/Teff | Located in the Andromeda Galaxy |
Psi1 Aurigae | 753[15] | AD | |
GP Cassiopeiae | 751[1] | L/Teff | |
Outer limits of the asteroid belt | 750-900 | Reported for reference | |
SMC 11939 | 750[16] | L/Teff | |
R Cygni | 745[44][45] | L/Teff | |
RU Virginis | 740[46] | L/Teff | |
LMC 137818 | 740[16] | L/Teff | Located in the Large Magellanic Cloud |
SMC 48122 | 740[16] | L/Teff | |
V923 Centauri | 736[15] | AD | |
IRAS 04545-7000 | 730[13] | L/Teff | Located in the Large Magellanic Cloud |
IRAS 05003-6712 | 730[13] | L/Teff | Located in the Large Magellanic Cloud |
SMC 56732 | 730[16] | L/Teff | |
WOH SG374 | 730[47] | L/Teff | |
GU Cephei | 730[15] | AD | |
KK Persei | 724[1] | L/Teff | |
AD Persei | 724[24] | L/Teff | |
RSGC1-F07 | 718[1]-910[5] | L/Teff | Located in the massive open cluster RSGC1. |
XX Persei | 710[1] | L/Teff | Located in the Perseus Double Cluster and near the border with Andromeda. |
V648 Cassiopeiae | 710[4] | L/Teff | |
Stephenson 2-04 | 710[1] | L/Teff | |
Mercer 8-06 | 707[1] | L/Teff | |
HV 1652 | 706[6] | L/Teff | |
HD 179821 | 704[48] | DSKE | HD 179821 may be a yellow hypergiant or a much less luminous star. |
SMC 55681 | 704[6] | L/Teff | |
V407 Puppis | 703[15] | AD | |
J004255.95+404857.5 | 700-785[26] | L/Teff | Located in the Andromeda Galaxy |
V528 Carinae | 700[4] | L/Teff | |
J003950.98+405422.5 | 700[49] | L/Teff | Located in the Andromeda Galaxy |
LMC 169754 | 700[16] | L/Teff | Located in the Large Magellanic Cloud |
LMC 65558 | 700[16] | L/Teff | Located in the Large Magellanic Cloud |
SP77 30-6 (WOH S66) | 700[47] | L/Teff | |
V770 Cassiopeiae | 700[15] | AD | |
The following stars with sizes below 700 radii are kept here for comparison | |||
V354 Cephei | 685[50] | L/Teff | The star is an irregular variable, so estimates may be uncertain. |
RX Telescopii | 682-1,882[15] | AD | RX Telescopii may be as large as 1,882 R☉. But the lower estimate is used here. |
Antares (Alpha Scorpii A) | 680[51] (varies by 19%)[52] | AD | Antares was originally calculated to be over 850 R☉,[53][54] but those estimates are likely to have been affected by asymmetry of the atmosphere of the star. |
Rho Cassiopeiae | 636-981[55] | AD | Yellow hypergiant, one of the rarest types of a star. |
V509 Cassiopeiae (HR 8752) | 590[15] | AD | Yellow hypergiant, one of the rarest types of a star. |
CE Tauri | 587-593[56] (-608[57]) | AD | Can be occulted by the Moon, allowing accurate determination of its apparent diameter. |
V382 Carinae | 471[15] | AD | Yellow hypergiant, one of the rarest types of a star. |
V838 Monocerotis | 467[58] | L/Teff | A short time after the outburst V838 Mon was measured at 1,570 ± 400 R☉,[59] but its distance, 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 below). |
The Pistol Star | 420[60] | AD | Blue hypergiant, among the most massive and luminous stars known. |
Sigma Canis Majoris | 420[4] | ||
Inner limits of the asteroid belt | 380 | Reported for reference | |
IRC +10420 | 357[61] | L/Teff | A yellow hypergiant that has increased its temperature into the LBV range. De beck et al. 2010 calculates 1,342 R☉ based on a much cooler temperature.[18] |
Mira A (Omicron Ceti) | 332-402[62] | AD | Prototype Mira variable. De beck et al. 2010 calculates 541 R☉.[18] |
R Doradus | 298[63] | AD | Star with the second largest apparent size after the Sun. |
Orbit of Mars | 297-358 | Reported for reference | |
La Superba (Y Canum Venaticorum) | 289[15] | AD | Referred to as La Superba by Angelo Secchi. Currently one of the coolest and reddest stars. |
Sun's red giant phase | 256[64] | At this point, the Sun will engulf Mercury and Venus, and possibly the Earth although it will move away from its orbit since the Sun will lose a third of its mass. During the helium burning phase, it will shrink to 10 R☉ but will later grow again and become an unstable AGB star, and then a white dwarf after making a planetary nebula.[65][66] Reported for reference | |
Eta Carinae A | ~240[67] | Previously thought to be the most massive single star, but in 2005 it was realized to be a binary system. During the Great Eruption, the size was much larger at around 1,400 R☉.[68] η Car is calculated to be between 60 R☉ and 881 R☉.[69] | |
Orbit of Earth | 215 (211-219) | Reported for reference | |
Lambda Velorum | 210[70] | ||
Solar System Habitable Zone | 200-520[71] (uncertain) | Reported for reference | |
Orbit of Venus | 154-157 | Reported for reference | |
Epsilon Aurigae A (Almaaz) | 143-358[72] | AD | ε Aur was incorrectly claimed in 1970 as the largest star with a size between 2,000 R☉ and 3,000 R☉,[73] even though it later turned out not to be an infrared light star but rather a dusk torus surrounding the system. |
Deneb (Alpha Cygni) | 99.84[15] | AD | Prototype Alpha Cygni variable. |
Peony Star | 92[74] | AD | Candidate for most luminous star in the Milky Way. |
Rigel | 78.9 | Brightest star in Orion. | |
Canopus (Alpha Carinae) | 71 | AD | Second brightest star in the night sky. |
Orbit of Mercury | 66-100 | Reported for reference | |
LBV 1806-20 | 46-145 | L/Teff | Formerly a candidate for the most luminous star in the Milky Way with 40 million L☉,[75] but the luminosity has been revised later only 2 million L☉.[76][77] |
Aldebaran (Alpha Tauri) | 43.06[15] | AD | |
Polaris (Alpha Ursae Minoris) | 37.5[78] | AD | The current northern pole star. |
R136a1 | 28.8[79]-35.4[80] | AD | Also on record as the most massive and luminous star known (315 M☉ and 8.71 million L☉). |
Arcturus (Alpha Boötis) | 24.25[15] | AD | Brightest star in the northern hemisphere. |
HDE 226868 | 20-22[81] | The supergiant companion of black hole Cygnus X-1. The black hole is around 500,000 times smaller than the star. | |
HD 49674 | 1.01 | Star similar to the Sun. | |
Sun | 1 | The largest object in the Solar System. Reported for reference |
- Methods for calculating the radius:
- AD: radius determined from angular diameter and distance
- L/Teff: radius calculated from bolometric luminosity and effective temperature
- DSKE: radius calculated using the disk emission
- EB: radius determined from observations of the eclipsing binary
References
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