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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 (695,700 km; 432,287.938 mi).
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. Most do not, so astronomers calculate their size by their spectral type (which gives their luminosity), distance, and brightness. Other stars can have their apparent diameter measured by an interferometer; If the star's distance is known, the real size can be found.
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. This makes their true size uncertain. Many of these stars vary in size and brightness (like Betelguese, Antares, Mu Cephei and VY Canis Majoris). Galaxies have different properties that affect how large their stars can be. This is why there are separate lists for galaxies.
These objects are 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.
Astrophysicist Robert F. Wing did an in-depth look on the largest stars, recognising Antares, Betelgeuse, Mu Cephei, and VV Cephei A as well-accepted largest stars, while also looking at other stars known for cool temperatures and high brightness like VY Canis Majoris and NML Cygni. The Stefan–Boltzmann law says these stars would have a large size.[1]
While red supergiants and hypergiants are usually the largest stars, some stars can increase their size for a short time before shrinking again. This process is called an eruption.[2] Some eruptions, like those of Eta Carinae and V838 Monocerotis, made them much larger than the largest stars for a short time. These are listed separately.
There are theories that say that stars cannot be larger than approximately 1,500 R☉ (Milky Way)[3][3]
It is thought stars cannot get much larger than this, based on current theories, or they would be unstable.[3]
This list is not complete; you can help by adding missing items. |
Star name | Solar radii (Sun = 1) |
Method[lower-alpha 1] | Notes
| |||||
---|---|---|---|---|---|---|---|---|
The sizes above may not be correct because theories say stars cannot be larger than approximately 1,500 R☉[3] | ||||||||
Maximum star size (Milky Way)[3] | ~1,500 | Not an exact number. It is thought stars cannot get much larger than this, based on current theories, or they would be unstable.[3]--> | ||||||
RSGC1-F01 | 1450 [4]-1,530+330 −424[5] | L/Teff | Located in the massive open cluster RSGC1. | |||||
VY Canis Majoris | 1,420[6] | AD | VY CMa is possibly the largest star in the Milky Way although galactic red supergiants above are possibly larger but they have less accurate radius estimates.[7] Older estimates originally estimated the radius of VY CMa to be above 3,000 R☉,[8] or as little as 600 R☉.[9] The 1,420 R☉ measure has a margin of error of ±120 R☉.[6] | |||||
KY Cygni | 1,420[3] (1,033[10]) | L/Teff | ||||||
AH Scorpii | 1,411[11] | 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. | |||||
V766 Centauri Aa | 1,315 ± 260[12] | AD | V766 Centauri Aa 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 1,060-1,160 solar radii[13] to 1,490 ± 540 solar radii. | |||||
S Persei | 1,298[14] | 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.[3] Older estimates gave up to 2,853 R☉ based on higher luminosities.[15] | |||||
RW Cygni | 1,273[16] | AD | ||||||
PZ Cassiopeiae | 1,259–1,336[17] | L/Teff | ||||||
Westerlund 1-237 | 1,245[18] | L/Teff | Red supergiant within the Westerlund 1 super star cluster. | |||||
IRC -10414 | 1,200[19] | L/Teff | IRC -10414 is a rare red supergiant companion to WR 114 that has a bow shock. | |||||
HD 90587 | 1,181[16] | AD | ||||||
RSGC1-F03 | 1,168[20]-1,326[18] | L/Teff | Located in the massive open cluster RSGC1. | |||||
EV Carinae | 1,168[21] | L/Teff | Older estimates based on much larger distances have given higher luminosities, and consequently larger radii.[22][15] | |||||
Westerlund 1-26 | 1,165 or 1,221[23] | L/Teff | Very uncertain parameters for an unusual star with strong radio emission. The spectrum is variable but apparently the luminosity is not. | |||||
HD 143183 (V558 Normae) | 1,147[24] | AD | ||||||
V602 Carinae | 1,142[16] | AD | ||||||
MY Cephei | 1,135[25] | 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.[26] | |||||
RSGC1-F02 | 1,128[27]-1,549[18] | L/Teff | Located in the massive open cluster RSGC1. | |||||
VX Sagittarii | 1,120-1,550[28] | 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☉.[29] Widely known as one of the largest known stars.[1][29] | |||||
RSGC1-F08 | 1,088[18]-1,146[20] | L/Teff | Located in the massive open cluster RSGC1. | |||||
Trumpler 27-1 | 1,073[30] | L/Teff | ||||||
Orbit of Jupiter | 1,064-1,173 | Reported for reference | ||||||
VV Cephei A | 1,050[31] | 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, disproven estimates give up to 1,800 solar radii. Widely known as one of the largest known stars.[1] | |||||
SU Persei | 1,039[16] | AD | In the Perseus Double Cluster | |||||
RW Leonis Minoris | 1,028[32] | L/Teff | Also called CIT (California Institute of Technology) 6. | |||||
RSGC1-F12 | 1,005[18] | L/Teff | Located in the massive open cluster RSGC1. | |||||
Red giant phase of Van Maanen 2 | 1,000[33] | Evolutionary models | van Maanen 2 is now one of the closest stars to the Sun, and the closest single white dwarf. | |||||
RT Carinae | 995[16] | AD | ||||||
RSGC1-F13 | 993[18]-1,098[20] | L/Teff | Located in the massive open cluster RSGC1. | |||||
RSGC1-F09 | 986[20]-1,231[18] | L/Teff | Located in the massive open cluster RSGC1. | |||||
NR Vulpeculae | 980[3] | L/Teff | ||||||
Mu Cephei | 972 ± 228[34] | AD | ||||||
Quyllur | 965[35] | Distant red supergiant that the James Webb Space Telescope saw. | Westerlund 1-20 | 965[18] | L/Teff | Red supergiant within the Westerlund 1 super star cluster. | ||
V396 Centauri | 965[16] | AD | ||||||
GCIRS 7 | 960[36]-1,368[37] | AD | Located at the galactic center. Margin of possible error: ±92 R☉[36] or ±150 R☉.[38] | |||||
RSGC1-F11 | 955[18]-1,015[20] | L/Teff | Located in the massive open cluster RSGC1. | |||||
RSGC1-F10 | 931[20]-954[18] | L/Teff | Located in the massive open cluster RSGC1. | |||||
RSGC1-F04 | 914[18]-1,082[20] | L/Teff | Located in the massive open cluster RSGC1. | |||||
UY Scuti | 909[39] | L/Teff | ||||||
RW Cephei | 900-1760 | L/Teff | ||||||
RSGC1-F06 | 885[20]-967[18] | L/Teff | Located in the massive open cluster RSGC1. | |||||
AZ Cygni | 861[16] | AD | ||||||
BI Cygni | 850[40]-1,240[3] | L/Teff | ||||||
KW Sagittarii | 850[16] | AD | Older estimates have given larger radii and consequently cooler temperatures.[3] | |||||
6 Geminorum (BU Geminorum) | 787[16] | AD | ||||||
U Lacertae | 785[30] | L/Teff | ||||||
RS Persei | 770[41]-831[25] | AD & L/Teff | In the Perseus Double Cluster. Margin of possible error: ±30 R☉.[41] | |||||
V915 Scorpii | 760[10][42] | L/Teff | ||||||
S Cephei | 760[43] | AD | ||||||
Psi1 Aurigae | 753[16] | AD | A red supergiant similar to Antares and Betelgeuse (see below), but much further away. | |||||
Outer limits of the asteroid belt | 750-900 | Reported for reference | ||||||
RSGC1-F07 | 718[18]-910[20] | L/Teff | Located in the massive open cluster RSGC1. | |||||
XX Persei | 710[18] | L/Teff | Located in the Perseus Double Cluster and near the border with Andromeda. | |||||
V648 Cassiopeiae | 710[3] | L/Teff | ||||||
Stephenson 2-04 | 710[18] | L/Teff | ||||||
HD 179821 | 704[44] | DSKE | HD 179821 may be a yellow hypergiant or a much less luminous star. | |||||
V528 Carinae | 700[3] | L/Teff | ||||||
The following notable stars with sizes below 700 solar radii are kept here for comparison | ||||||||
Antares (Alpha Scorpii A) | 680[45] (varies by 19%)[46] | AD | Antares was once thought to be over 850 R☉,[47][48] but those estimates are likely to have been affected by asymmetry of the atmosphere of the star. Widely known as one of the largest known stars.[1] | |||||
Betelgeuse (Alpha Orionis) | ~640[49]-697[16] | AD | Star with the third largest apparent size after R Doradus and the Sun. Another estimate gives 955±217 R☉[50] This estimate might not be reliable due to problems with measuring red supergiants in this way, but is consistent with other size estimates. Betelgeuse is a variable star so it changes size often. Widely known as one of the largest known stars.[1] | |||||
Rho Cassiopeiae | 636-981[51] | AD | Yellow hypergiant, one of the rarest types of a star. | |||||
V509 Cassiopeiae (HR 8752) | 590[16] | AD | Yellow hypergiant, one of the rarest types of a star. | |||||
CE Tauri | 587-593[52] (-608[53]) | AD | Can be occulted by the Moon, allowing accurate determination of its apparent diameter. | |||||
V382 Carinae | 471[16] | AD | Yellow hypergiant, one of the rarest types of a star. | |||||
V838 Monocerotis | 467[54] | L/Teff | A short time after the outburst V838 Mon was measured at 1,570 ± 400 R☉,[55] 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[56] | AD | Blue hypergiant, among the most massive and luminous stars known. | |||||
Inner limits of the asteroid belt | 380 | Reported for reference | ||||||
Mira A (Omicron Ceti) | 332-402[57] | AD | Prototype Mira variable. De beck et al. 2010 calculates 541 R☉.[58] | |||||
R Doradus | 298[59] | 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[16] | AD | Referred to as La Superba by Angelo Secchi. Currently one of the coolest and reddest stars. | |||||
Sun's red giant phase (asymptotic giant branch) | 256[60] | 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.[61][62] Reported for reference | ||||||
Eta Carinae A | ~240[63] | Previously thought to be the most massive single star, but in 2005 it was realized to be a binary system. η Car lacks a good surface as the wind from it is so thick. It has a "core" with a radius of 60 R☉ and the edge of the wind has a radius of 881 R☉.[64] | ||||||
Orbit of Earth | 215 (211-219) | Reported for reference | ||||||
Solar System Habitable Zone | 200-520[65] (uncertain) | Reported for reference | ||||||
Orbit of Venus | 154-157 | Reported for reference | ||||||
Epsilon Aurigae A (Almaaz) | 143-358[66] | AD | ε Aur was incorrectly claimed in 1970 as the largest star with a size between 2,000 R☉ and 3,000 R☉,[67] 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[16] | AD | Prototype Alpha Cygni variable. | |||||
WR 102ka | 92[68] | 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☉,[69] but the luminosity has been revised later only 2 million L☉.[70][71] | |||||
Aldebaran (Alpha Tauri) | 43.06[16] | AD | Close red giant star. | |||||
Polaris (Alpha Ursae Minoris) | 37.5[72] | AD | The current northern pole star and a well-known Cepheid variable. | |||||
Arcturus (Alpha Boötis) | 24.25[16] | AD | Brightest star in the northern hemisphere, and a K-type red giant. | |||||
HDE 226868 | 20-22[73] | The supergiant companion of black hole Cygnus X-1. The black hole is around 500,000 times smaller than the star. | ||||||
VV Cephei B | 13[74]–25[75] | The blue main-sequence star companion of VV Cephei A. | ||||||
Pollux (Beta Geminorum) | 9.06 ± 0.03 [76] | The nearest giant star to Earth. | ||||||
Regulus (Alpha Leonis) | 4.35 ± 0.1[76] | The nearest B-type star to Earth. | ||||||
Vega (Alpha Lyrae) | 2.726±0.006 × 2.418±0.012[77] | One of the brightest stars in the night sky. | ||||||
Sirius A (Alpha Canis Majoris A) | 1.711[78] | The brightest star in the night sky. | ||||||
Alpha Centauri A | 1.2175[79] | Nearest G-type yellow dwarf to the Sun. | ||||||
Sun | 1 | The largest object in the Solar System. Reported for reference |
Star name | Solar radii
(Sun = 1) |
Method | Notes |
---|---|---|---|
WOH G64 | 1,540[80] | L/Teff | Located in the Large Magellanic Cloud and likely the largest known star.[81][82] |
WOH S281 | 1,376[83] | L/Teff | |
HV 888 (WOH S140) | 1,353[84]-1,974[83] | L/Teff | Located in the Large Magellanic Cloud. |
HV 11423 | 1,086[83] | L/Teff | Located in the Small Magellanic Cloud. 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. |
SMC 018136 | 945[85] | L/Teff | |
HV 986 | 867 | ||
The following notable stars with sizes below 700 solar radii are kept here for comparison | |||
HV 2112 | 675-1,193[86] | L/Teff | Once thought to be a possible Thorne–Żytkow object, or a red supergiant with a neutron star core. |
HD 269953 | 647-720 | A yellow hypergiant. | |
HD 33579 | 471[87] | L/Teff | The brightest star in the Large Magellanic Cloud. |
S Doradus | 100-380[88] | L/Teff | A notable blue hypergiant among the most luminous stars known. |
HD 37974 | 99[89] | L/Teff | A blue hypergiant with a dusty disk. |
R136a1 | 28.8[90]-35.4[91] | AD | One of the most massive and luminous stars known (196 M☉ and around 5 million L☉). |
BAT99-98 | 37.5[92] | L/Teff | One of the most massive and luminous stars known. |
HD 5980 A | 24[93] | L/Teff | One of the most massive and luminous stars known. |
Star name | Solar radii
(Sun = 1) |
Galaxy | Method | Notes |
---|---|---|---|---|
NGC 2403 V14 | 1,260 | NGC 2403 | F-type star. | |
Quyllur | 965[94] | L/Teff | Distant red supergiant that the James Webb Space Telescope saw. | |
Godzilla | 430-2,365[95] | Sunburst Galaxy | The most luminous star ever known, at up to 255 million times brighter than the Sun. | |
Mothra | 271[96] | A binary star. | ||
NGC 2363-V1 | 194-356[97] | NGC 2366 | L/Teff |
Star name | Solar radii
(Sun = 1) |
Year | Galaxy | Method | Notes |
---|---|---|---|---|---|
AT 2017jfs | 33,000[98] | 2017 | NGC 4470 | L/Teff | |
SNhunt151 | 16,700[99] | 2014 | UGC 3165 | L/Teff | |
Orbit of Neptune | ~6,500[100] | Reported for reference | |||
M51 OT2019-1 | 5,486[101] | 2019 | Whirlpool Galaxy | L/Teff | |
Eta Carinae | 4,319-6,032[102] | 1845 | Milky Way | L/Teff | During this time, it became the second-brightest star in the night sky. |
Orbit of Uranus | 4,121.7-4,126.3 | Reported for reference | |||
V838 Monocerotis | 3,190[103] | 2002 | Milky Way | L/Teff | |
PHL 293B's luminous blue variable | 1,348–1,463[104] | 2002 | PHL 293B | L/Teff | This star, a blue supergiant, may not exist anymore. |
R71 | 500[105] | 2012 | Large Magellanic Cloud | L/Teff | |
Godzilla | 430-2,365[95] | 2015 | Sunburst Galaxy | L/Teff |
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