User:Nussun05/Updated list of largest stars

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Not to be confused with List of most massive stars.
Relative sizes of the planets in the Solar System and several well-known stars:

Below is a list of the largest stars currently known, ordered by radius. The unit of measurement used is the radius of the Sun (approximately 695,700 km; 432,288 mi).

The angular diameters of stars can be measured directly using stellar interferometry. Other methods can use lunar occultations or from eclipsing binaries, which can be used to test indirect methods of finding stellar radii. Only a few useful supergiant stars can be occulted by the Moon, including Antares A (Alpha Scorpii A). Examples of eclipsing binaries are Epsilon Aurigae (Almaaz), VV Cephei, and V766 Centauri (HR 5171). Angular diameter measurements can be inconsistent because the boundary of the very tenuous atmosphere (opacity) differs depending on the wavelength of light in which the star is observed.

Uncertainties remain with the membership and order of the list, especially when deriving various parameters used in calculations, such as stellar luminosity and effective temperature. Often stellar radii can only be expressed as an average or be within a large range of values. Values for stellar radii vary significantly in different sources and for different observation methods.

All the sizes stated on this last have various inaccuracies and all of them may be disputed. This list is still a work in progress and various parameters are extremely disputed.

Caveats[edit]

Comparison of the sizes of several stars. From left to right are Cygnus OB2#12 (blue hypergiant), V382 Carinae (yellow hypergiant), V915 Scorpii (orange hypergiant) and the extreme red supergiants UY Scuti and Stephenson 2-18. The orbits of Saturn and Neptune are also shown for comparison.

Various issues exist in determining accurate radii of the largest stars, which in many cases do display significant errors. The following lists are generally based on various considerations or assumptions; these include:

  • Stellar radii or diameters are usually derived only approximately using Stefan-Boltzmann law for the deduced stellar luminosity and effective surface temperature.
  • Stellar distances, and their errors, for most stars, remain uncertain or poorly determined.
  • Many supergiant stars have extended atmospheres, and many are within opaque dust shells, making their true effective temperatures and surfaces highly uncertain.[citation needed]
  • Many extended supergiant atmospheres also significantly change in size over time, regularly or irregularly pulsating over several months or years as variable stars. This makes adopted luminosities poorly known and may significantly change the quoted radii.
  • Other direct methods for determining stellar radii rely on lunar occultations or from eclipses in binary systems. This is only possible for a very small number of stars.
  • In this list are some examples of extremely distant extragalactic stars, which may have slightly different properties and natures than the currently largest-known stars in the Milky Way. For example, some red supergiants in the Magellanic Clouds are suspected to have slightly different limiting temperatures and luminosities. Such stars may exceed accepted limits by undergoing large eruptions or changing their spectral types over just a few months (or potentially years).[1][2]

List[edit]

Legend
Milky Way
Large Magellanic Cloud
Small Magellanic Cloud
Andromeda Galaxy
Triangulum Galaxy
Kinman's Dwarf
List of the largest stars
Star name Solar radii
(Sun = 1) 		Method[a] Notes Stephenson 2-18 2,150[3] L/Teff Located within close proximity of the open cluster Stephenson 2 MY Cephei 2,061[4] L/Teff Not to be confused with Mu Cephei (see below). Older estimates have given up to 2,440 R☉ based on much cooler temperatures.[5]
2MASS J00453996+4154036 1,980[6] L/Teff Located in the Andromeda Galaxy
1,953[7] L/Teff Located in the Triangulum Galaxy
2MASS J00452065+4147171 1,870[6] L/Teff Located in the Andromeda Galaxy
1,863[7] L/Teff Located in the Triangulum Galaxy
1,765[7] L/Teff Located in the Triangulum Galaxy
1,739[8] L/Teff Located in the Large Magellanic Cloud V538 Carinae 1,708[9][b] AD
1,662[10] L/Teff Located in the Large Magellanic Cloud NML Cygni 1,639–2,770[11] L/Teff Located in the Cygnus OB2 association. It is known as a heavily mass-losing OH/IR supergiant.
1,600[12] L/Teff Located in the Small Magellanic Cloud
1,557[13] L/Teff Located in the Small Magellanic Cloud
WOH G64 1,540±77[14] L/Teff Located in the Large Magellanic Cloud RSGC1-F01 1,530[4] L/Teff Located in the open cluster RSGC1
1,526[13] L/Teff Located in the Large Magellanic Cloud
1,485[7] L/Teff Located in the Andromeda Galaxy
1,477[15] L/Teff Located in the Large Magellanic Cloud
1,436[7] L/Teff Located in the Triangulum Galaxy
S Persei 1,428+627
−379[16] 		AD A red supergiant located in the Perseus Double Cluster. Levesque et al. 2005 calculated radii of 780 R☉ and 1,230 R☉ based on K-band measurements.[17] Older estimates gave up to 2,853 R☉ based on higher luminosities.[18]
1,424[7] L/Teff Located in the Andromeda Galaxy RSGC1-F04 1,422[4] L/Teff Located in the open cluster RSGC1
VY Canis Majoris 1,420±120[19] AD Used to be described as the largest known star based on a radius of 1,800–2,100 R☉.[20] Older estimates gave the radius of VY CMa as above 3,000 R☉,[21] or as little as 600 R☉.[22] Matsuura et al. 2013 estimates 2,069 R☉ based on a luminosity of 237,000 L☉ and an assumed effective temperature of 2,800 K.[23]
AH Scorpii 1,411±124[24] AD AH Sco is a variable by nearly 3 magnitudes in the visual range, and an estimated 20% in luminosity. The variation in diameter is not clear because the temperature also varies.
2MASS J00442845+4151306 1,410[6] L/Teff Located in the Andromeda Galaxy
1,385[13] L/Teff Located in the Large Magellanic Cloud RSGC1-F06 1,382[4] L/Teff Located in the open cluster RSGC1
1,376[13] L/Teff Located in the Large Magellanic Cloud VX Sagittarii 1,356[25] AD A pulsating variable star with a variation of over 7 magnitudes in visual brightness. It is the most luminous AGB star ever discovered at bolometric magnitude –8.6.[25] ST Cephei 1,348[9][b] AD
1,346[7] L/Teff Located in the Andromeda Galaxy
1,320[7] L/Teff Located in the Andromeda Galaxy
1,317[13] L/Teff Located in the Large Magellanic Cloud
1,313[12] L/Teff Located in the Small Magellanic Cloud SW Cephei 1,309[9][c] AD
1,306[12] L/Teff Located in the Small Magellanic Cloud IRC -10447 1,301[4] L/Teff Located in the open cluster Stephenson 2 Stephenson 2-11 1,300[4] L/Teff Located in the open cluster Stephenson 2
1,298[13] L/Teff Located in the Large Magellanic Cloud
1,298[7] L/Teff Located in the Andromeda Galaxy
1,295[7] L/Teff Located in the Triangulum Galaxy
1,294[12] L/Teff Located in the Large Magellanic Cloud
1,278[13] L/Teff Located in the Large Magellanic Cloud
1,271[12] L/Teff Located in the Large Magellanic Cloud
2MASS J00431239+4137470 1,270[6] L/Teff Located in the Andromeda Galaxy
1,265[7] L/Teff Located in the Andromeda Galaxy PZ Cassiopeiae 1,259–1,336[26] L/Teff
1,258[7] L/Teff Located in the Triangulum Galaxy
1,253[13] L/Teff Located in the Large Magellanic Cloud
1,252[7] L/Teff Located in the Triangulum Galaxy
2MASS J00451490+4137348 1,250[6] L/Teff Located in the Andromeda Galaxy
1,249[7] L/Teff Located in the Triangulum Galaxy RSGC1-F10 1,246[4] L/Teff Located in the open cluster RSGC1
Westerlund 1-237 1,241±70[27] L/Teff Located in the open cluster Westerlund 1
2MASS J00442807+4155030 1,240[6] L/Teff Located in the Andromeda Galaxy
1,235[13] L/Teff Located in the Large Magellanic Cloud
1,229[7] L/Teff Located in the Andromeda Galaxy
1,222[7] L/Teff Possible H II region. Located in the Andromeda Galaxy
1,215[12] L/Teff Located in the Small Magellanic Cloud
IRC -10414 1,200[28] L/Teff IRC -10414 is a rare red supergiant that has a bow shock, and is located close in the sky (45 arc-seconds away) to WR 114.
2MASS J00412521+4112089 1,200[6] L/Teff Located in the Andromeda Galaxy
1,199[7] L/Teff Located in the Triangulum Galaxy
1,195[12] L/Teff Located in the Large Magellanic Cloud HD 90587 1,191[9][c] AD
1,187[12] L/Teff Located in the Small Magellanic Cloud
1,187[13] L/Teff Located in the Large Magellanic Cloud RSGC1-F05 1,185[4] L/Teff Located in the open cluster RSGC1
1,177[13] L/Teff Located in the Large Magellanic Cloud
1,174[7] L/Teff Located in the Andromeda Galaxy
2MASS J00452494+4207269 1,170[6] L/Teff Located in the Andromeda Galaxy
GCIRS 7 1,170±60[29] L/Teff Located at the galactic center
EV Carinae 1,165[30] L/Teff
Westerlund 1-26 1,165±58–1,221±120[27] L/Teff Very uncertain parameters for an unusual star with strong radio emission. The spectrum is variable but apparently the luminosity is not.
1,164[13] L/Teff Located in the Large Magellanic Cloud
1,159[7] L/Teff Located in the Andromeda Galaxy
1,157[7] L/Teff Located in the Triangulum Galaxy V602 Carinae 1,151[9][c] AD RSGC1-F08 1,150[4] L/Teff Located in the open cluster RSGC1
1,149[13] L/Teff Located in the Large Magellanic Cloud
1,149[7] L/Teff Located in the Triangulum Galaxy
1,143[7] L/Teff Located in the Andromeda Galaxy
2MASS J00404720+4044453 1,140[6] L/Teff Located in the Andromeda Galaxy
[M98a] M 31ob78-300 1,140[6] L/Teff Located in the Andromeda Galaxy
1,139[7] L/Teff Located in the Triangulum Galaxy
1,139–1,731[31] L/Teff A luminous blue variable star located in the low metallicity galaxy PHL 293B. It is thought to have disappeared.
1,137[13] L/Teff Located in the Large Magellanic Cloud
1,133[7] L/Teff Located in the Andromeda Galaxy
2MASS J00412479+4116346 1,130[6] L/Teff Located in the Andromeda Galaxy
1,129[12] L/Teff Located in the Large Magellanic Cloud RSGC1-F02 1,128[4] L/Teff Located in the open cluster RSGC1
1,128[12] L/Teff Located in the Small Magellanic Cloud
1,124[15] L/Teff Located in the Large Magellanic Cloud
1,122[7] L/Teff Located in the Triangulum Galaxy
1,121[7] L/Teff Located in the Andromeda Galaxy
1,119[15] L/Teff Located in the Large Magellanic Cloud
1,115[7] L/Teff Located in the Triangulum Galaxy
1,107[12] L/Teff Located in the Large Magellanic Cloud
1,104[13] L/Teff Located in the Large Magellanic Cloud
RW Cygni 1,103+251
−177[16] 		AD
2MASS J00410716+4116360 1,100[6] L/Teff Located in the Andromeda Galaxy
1,099[7] L/Teff Located in the Andromeda Galaxy
1,086[13] L/Teff Located in the Large Magellanic Cloud
1,085–1,283[10] L/Teff Located in the Large Magellanic Cloud
1,084[7] L/Teff Located in the Andromeda Galaxy
1,081[7] L/Teff Located in the Triangulum Galaxy
[BHG88] 40 1980 1,080[6] L/Teff Located in the Andromeda Galaxy
1,080–1,153[10] L/Teff Located in the Large Magellanic Cloud
1,077[12] L/Teff Located in the Small Magellanic Cloud
1,076[7] L/Teff Located in the Andromeda Galaxy LL Pegasi A 1,074[32] L/Teff
1,073[12] L/Teff Located in the Large Magellanic Cloud
1,073[7] L/Teff Located in the Triangulum Galaxy
CD-33 12241 1,073[33] L/Teff
1,072[12] L/Teff Located in the Large Magellanic Cloud
1,072[12] L/Teff Located in the Small Magellanic Cloud
1,071[7] L/Teff Located in the Triangulum Galaxy
2MASS J00453111+4148254 1,070[6] L/Teff Located in the Andromeda Galaxy
IM Cassiopeiae 1,068[9][c] AD
1,067[12] L/Teff Located in the Small Magellanic Cloud
HR 5171 Aa (V766 Centauri Aa) 1,060–1,160[34] L/Teff Yellow hypergiant, one of the rarest types of a star.
1,060[7] L/Teff Located in the Andromeda Galaxy
1,060[7] L/Teff Located in the Andromeda Galaxy HaroChavira 1 1,058[35] L/Teff
1,057[7] L/Teff Located in the Andromeda Galaxy
1,054[7] L/Teff Located in the Andromeda Galaxy
1,053[12] L/Teff Located in the Small Magellanic Cloud
1,051[15] L/Teff Located in the Large Magellanic Cloud
1,051[13] L/Teff Located in the Large Magellanic Cloud
1,050[13] L/Teff Located in the Large Magellanic Cloud
VV Cephei A 1,050[36] L/Teff 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☉[17]
1,047[7] L/Teff Located in the Triangulum Galaxy
1,047[7] L/Teff Located in the Triangulum Galaxy
1,046[7] L/Teff Located in the Triangulum Galaxy
1,046[13] L/Teff Located in the Small Magellanic Cloud WX Piscium 1,044[37] L/Teff
1,043[12] L/Teff Located in the Large Magellanic Cloud
1,042[12] L/Teff Located in the Large Magellanic Cloud
1,041[7] L/Teff Located in the Andromeda Galaxy
2MASS J00411415+4037596 1,040[6] L/Teff Located in the Andromeda Galaxy
1,037[7] L/Teff Located in the Andromeda Galaxy
1,034[7] L/Teff Located in the Andromeda Galaxy
1,033[7] L/Teff Located in the Andromeda Galaxy KY Cygni 1,032[35] L/Teff RSGC1-F11 1,032[4] L/Teff Located in the open cluster RSGC1 BC Cygni 1,031[35] L/Teff RW Leonis Minoris 1,028[32] L/Teff HD 155737 1,027[9][b] AD AS Cephei 1,026[9][c] AD
2MASS J00412571+4112128 1,020[6] L/Teff Located in the Andromeda Galaxy
2MASS J00405948+4045425 1,020[6] L/Teff Located in the Andromeda Galaxy
1,019[13] L/Teff Located in the Small Magellanic Cloud
1,018[7] L/Teff Located in the Andromeda Galaxy RSGC1-F13 1,017[4] L/Teff Located in the open cluster RSGC1
1,014[13] L/Teff Located in the Large Magellanic Cloud
1,013[7] L/Teff Located in the Andromeda Galaxy
KW Sagittarii 1,009±142[24] AD The peculiar cool spectrum of KW Sgr has led to comparisons with symbiotic variables, but it is no longer considered to be a cataclysmic binary.[38]
RSGC1-F07 1,006[4] L/Teff Located in the open cluster RSGC1
1,003[13] L/Teff Located in the Large Magellanic Cloud RT Carinae 1,003[9][c] AD
Sun 1 The largest object in the Solar System.
Reported for reference

Notes[edit]

  1. ^ Methods for calculating the radius:
  2. ^ a b c Uses the distance from Gaia EDR3
  3. ^ a b c d e f Uses the distance from Gaia DR2

See also[edit]

References[edit]

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