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] (-2,000[8])
VX Sagittarii 1,520[9]
HR 5171 A (V766 Centauri A) 1,490 ± 260[10] 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 Template:Solar radius, although the latest research suggests it is a red supergiant.
KY Cygni 1,420-2,850[11]
VY Canis Majoris 1,420 ± 120[12] 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[13] (1,050[14]–1,900[11])
μ Cephei (Herschel's "Garnet Star") 1,260[15] (650[16]-1,420[11])
V354 Cephei (Case 75) 690[9]-1,520[11]
NML Cygni 1,183[17](-1,650)[18] NML Cyg is a semiregular variable star surrounded by a circumstellar nebula and is heavily obscured by dust extinction.
Betelgeuse (Alpha Orionis) 1,180[19][20] 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[11]
KW Sagittarii 1,009[1]-1,460[11] Margin of possible error: ± 142 solar radii (Torres 2013).
Antares A (Alpha Scorpii A) 883[21]
CW Leonis 826[17]
V382 Carinae 747[22] Yellow hypergiant, one of the rarest types of star.
TV Geminorum 620-710[23](-770[11])
The following well-known stars are listed for the purpose of comparison.
CE Tauri ("Ruby Star")[24] 608[25] 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[26] Yellow hypergiant, one of the rarest types of a star.
Eta Carinae A (Tseen She) 60 - 800[27] 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.
V509 Cassiopeiae 400–900[28] Yellow hypergiant, one of the rarest types of a star.
R Leporis (Hind's "Crimson Star") 400 ± 90[29] One of the coolest stars existent in the Milky Way.
La Superba (Y Canum Venaticorum) 390[30] Currently one of the coolest and reddest stars.
V838 Monocerotis 380 ± 90[31] 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.[32] 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[33] Prototype Luminous Blue Variable.
R Doradus 370 ± 50[34] Star with the second largest apparent size after the Sun.
Epsilon Aurigae A (Almaaz) 358[35] ε Aur was incorrectly hailed as the largest star with a radius around Template:Solar radius, 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[36] Blue hypergiant, currently among the most massive and luminous stars.
Mira A (Omicron Ceti) 332–402[37] Prototype Mira variable.
Alpha Herculis (Ras Algethi) 264–303[38]
Delta Canis Majoris (Wezen) 237 ± 66[39] 36th brightest star in the night sky.
Deneb (Alpha Cygni) 220 ± 17[40] 19th brightest star in the night sky.
LBV 1806-20 >200[41] Formerly a candidate for the most luminous star in the Milky Way.
Beta Cygni A (Albireo) 109[42]
Peony Nebula Star 92[43] Candidate for most luminous star in the Milky Way.
Gamma Crucis (Gacrux) 84[44] The closest red giant star to the sun.
Rigel A (Beta Orionis A) 78.9 ± 7.4[45] Seventh brightest star in the night sky.
Canopus 71 ± 4[46] Second brightest star in the night sky.
Aldebaran (Alpha Tauri) 44.2 ± 0.9[47]
Polaris (Alpha Ursae Minoris) 37.5[48] The current north pole star.
R136a1 35.4[49] Also on the list as the most massive and luminous star.
Arcturus (Alpha Boötis) 25.4[50] Brightest star in the northern hemisphere.
HDE 226868 20–22[51] The supergiant companion of black hole Cygnus X-1. The black hole is 500,000 times smaller than the star.
VV Cephei B 13[52]-25[53] 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 Template:Solar radius.[54][55]
Reported for reference
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