List of largest stars

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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 (696,392 km; 432,717.927 mi).

Note: This list is not perfectly defined.

List[change | change source]

List of the largest stars
Star name Solar radii
(Sun = 1)
UY Scuti 1,708 ± 192[1] Currently the largest star in the Milky Way and in the universe. Margin of error in size determination: ± 192 solar radii.
WOH G64 1,540[2]–1,730[3] Once thought to be 2,000 R☉ [4]
RW Cephei 1,535[5][6]
Westerlund 1-26 1,530-1,580[7] (-2,544[8])
VX Sagittarii 1,520[9]
KY Cygni 1,420-2,850[10]
VY Canis Majoris 1,420 ± 120[11] Once thought to be 1,800 - 2,100 solar radii[5]; a size so large that places it outside the bounds of stellar evolutionary theory.
AH Scorpii 1,411 ± 124[1]
VV Cephei A 1,400[12] (1,050[13]–1,900[10])
HR 5171 A (V766 Centauri A) 1,315 ± 260[14] HR 5171 A is a highly distorted star in a close binary system, losing mass to the secondary. It may be the largest star of its type (yellow hypergiant) at , although the latest research suggests it is a red supergiant with a radius of 1,490 ± 540 R.[15]
μ Cephei (Herschel's "Garnet Star") 1,260[16] (650[17]-1,420[10])
NML Cygni 1,183[18]-2,770[19]/1,640[19] NML Cyg is a semiregular variable star surrounded by a circumstellar nebula and is heavily obscured by dust extinction.
Betelgeuse (Alpha Orionis) 887[20]-1,180[21] Ninth brightest star in the night sky. The angular diameter of Betelgeuse is only exceeded by R Doradus and the Sun.
RT Carinae 1,090[10]
KW Sagittarii 1,009[1]-1,460[10] Margin of possible error: ± 142 solar radii (Torres 2013).
DU Crucis 979[22] (596-1,180)[source?]
HV 2112 918[23]
CW Leonis 826[18]
Antares A (Alpha Scorpii A) 800[24] (680-900)[25]
V382 Carinae 747[26] Yellow hypergiant, one of the rarest types of star.
TV Geminorum 620-710[27](-770[10])
The following well-known stars are listed for the purpose of comparison.
V354 Cephei (Case 75) 690[9]-1,520[10]
CE Tauri ("Ruby Star")[28] 608[29] Also known as 119 Tauri, unofficially nicknamed the Ruby Star. Can be occulted by the Moon, allowing accurate determination of its apparent diameter.
Rho Cassiopeiae 450 ± 50[30] Yellow hypergiant, one of the rarest types of a star.
Eta Carinae A (Tseen She) 60 - 800[31] Previously thought to be the most massive single star, but in 2005 it was realized to be a binary system. Its size is poorly defined.
Theta Muscae Ac 422 The second brightest Wolf-Rayet in the night sky. Even though it is the lightest star star in the system, ironically it is the largest star in the system.
Mira A (Omicron Ceti) 332–402[32] Prototype Mira variable.
V509 Cassiopeiae 400–900[33] Yellow hypergiant, one of the rarest types of a star.
R Leporis (Hind's "Crimson Star") 400 ± 90[34] One of the coolest stars existent in the Milky Way.
La Superba (Y Canum Venaticorum) 390[35] Currently one of the coolest and reddest stars.
V838 Monocerotis 380 ± 90[36] V838 Mon is a new type of object known as a Luminous red nova. Previously estimated the radius of V838 Monocerotis to be at 1,570 ± 400 solar radii; the very large cool "L-type supergiant" reported with this radius is a transient object which will contract rapidly over a few decades.[37] Once topped to the list as one of the largest stars, after experiencing a nova outburst it gradually decreased in size.
S Doradus 100–380[38] Prototype Luminous Blue Variable.
R Doradus 370 ± 50[39] Star with the second largest apparent size after the Sun.
Epsilon Aurigae A (Almaaz) 358[40] ε Aur was incorrectly hailed as the largest star with a radius around 2,700–3,000 R, even though it later turned out not to be an infrared light star but rather a dusk torus surrounding the system.
The Pistol Star 346 ± 40[41] Blue hypergiant, currently among the most massive and luminous stars.
Alpha Herculis (Ras Algethi) 284[42]
Delta Canis Majoris (Wezen) 215 ± 66[43] 36th brightest star in the night sky.
Deneb (Alpha Cygni) 203 ± 17[44] 19th brightest star in the night sky.
LBV 1806-20 >200[45] Formerly a candidate for the most luminous star in the Milky Way.
Beta Cygni A (Albireo) 109[46]
Peony Nebula Star 92[47] Candidate for most luminous star in the Milky Way.
Gamma Crucis (Gacrux) 84[48] The closest red giant star to the sun.
Rigel A (Beta Orionis A) 78.9 ± 7.4[49] Seventh brightest star in the night sky.
Canopus 71 ± 4[50] Second brightest star in the night sky.
Aldebaran (Alpha Tauri) 44.2 ± 0.9[51]
Polaris (Alpha Ursae Minoris) 37.5[52] The current north pole star.
R136a1 35.4[53] Also on the list as the most massive and luminous star.
Arcturus (Alpha Boötis) 25.4[54] Brightest star in the northern hemisphere.
HDE 226868 20–22[55] The supergiant companion of black hole Cygnus X-1. The black hole is 500,000 times smaller than the star.
VV Cephei B 13[56]-25[57] The B-type main sequence companion of VV Cephei A.
Sun 1 The largest object in the solar system.
The core hydrogen would be exhausted in 5 billion years. In 7 billion years, The Sun would reach the tip of the red-giant branch of the Hertzsprung–Russell diagram, achieving its size of 256 to 436 R.[58][59]
Reported for reference

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