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List:Star Extremes

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The extreme red hypergiant star VY Canis Majoris in the constellation Canis Major compared to the Sun and Earth's orbit.

List of largest stars and planet orbits[edit]

List of smallest stars[edit]

This is a list of small stars that are otherwise notable for characteristics that are not separately listed.

Name Mean radius in kilometers Stellar Classification Notes and Caveats References
PSR B0943+10 2.6 pulsar [1]
PSR J0348+0432 A 6.5 + 1 Orbited by a white dwarf star (see below) [2]
PSR B1257+12 10 Orbited by three planets. [3]
PSR B0531+21 10 [4]
Geminga 10 [5]
XTE J1739-285 10.9 [6]
Vela pulsar 12 [7]
PSR B1937+21 18 - 20 [8]
XTE J1650-500 B 24 black hole This binary X-ray transient system, XTE J1650-500, component black hole, at 3.8 solar masses, is smaller than the previous recordholder GRO J1655-40 B of 6.3 MSun in the microquasar system GRO J1655-40. [9]
GRW +70 8247 3300 white dwarf Smallest white dwarf star known [10]
HZ Ceti A 4477.5
Sirius B 5466 Historically first detected white dwarf star [11]
LB 1497 5494.5 [12]
40 Eridani B 5547.5
ZZ Cet 5890[citation needed]
GD 165 5998[citation needed]
G 29-38 6000[citation needed]
Albireo B 6000
Procyon B 6700 [13][14]
ESO 439-26 8775.5 Faintest known white dwarf.[15]
Van Maanen 2 9048 [16]
Luhman 16 A 45000 Brown dwarf [17]
PSR J0348+0432 B 45268 White dwarf A white dwarf that orbits its pulsar companion (see above) [2]
Luhman 16 B 46500 Brown dwarf [17]
EBLM J0555-57Ab 59000 red dwarf This red dwarf is slightly larger than the planet Saturn. As of 2017, it is the smallest hydrogen-fusing star known, marginally heavier than the hydrogen burning mass limit separating stellar objects and the sub-stellar brown dwarfs. Although its mass is comparable to that of TRAPPIST-1A, its radius is 1/3 smaller. [18][19][20]
2MASS J0523-1403 60000 [21][22]
SSSPM J0829-1309 61300 [22]
TRAPPIST-1 79400 Hosts a planetary system with at least seven rocky planets. [23]
OGLE-TR-122B 81100 This was once the smallest known actively fusing star, when found in 2005, through 2013. It is the smallest eclipsing red dwarf, and smallest observationally measured diameter. [24][25][26]
Luyten 726-8 (A and B) 97000 [27]
Proxima Centauri 101000 This is the nearest neighbouring star to the Sun. [28]
Wolf 359 111400 [29]
Ross 248 111400 [30]
Barnard's Star 136400 [31]
CM Draconis B 167000 [32]
Ross 154 167000 [33]
CM Draconis A 176000 [32]
Kapteyn's Star 202500 This is the closest halo star to the Sun. [34]
Luyten's Star 243500 [35]
Teide 1 270240 Brown dwarf [36]
Lalande 21185 273500 Red dwarf [37]
Lacaille 9352 320000 [38]

Footnotes[edit]


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List of largest exoplanets[edit]

Below is a list of the largest exoplanets so far discovered, in terms of physical size, ordered by radius. The sizes are listed in units of Jupiter radii (RJ, R). All planets listed are larger than the largest planet in the Solar System, Jupiter.

Exoplanet Radius (RJ)
(Jupiter = 1)
Notes
CT Cha b 2.2[39] 11-23 MJ.
HD 39091 b 2.1759[40]
SIMP J2154–1055 2.15
KOI-368.01 2.1[41]
XO-6b 2.07[42] 1.9 (± 0.5) MJ; a very puffy Hot Jupiter
HAT-P-32b 2.037[42] 0.941 (± 0.166) MJ; a very puffy Hot Jupiter
KOI-3681.01 2.0+0.7
−1
[41]
Orbits fairly close to its 1.1+0.2
−0.2
M star, with 217 day-long years.
The following well-known exoplanets are listed for the purpose of comparison.
Exoplanet Radius (RJ)
(Jupiter = 1)
Notes
WASP-17b 1.991+0.08
−0.58
[note 1][42][43]
Was the largest known planet in 2012. At only 0.486 MJ, this Hot Jupiter is extremely low density.
KOI-680 b 1.99+0.18
−0.18
[41]
CVSO 30b 1.91+0.21
−0.21
[42]
51 Pegasi b 1.9[42]
HAT-P-65b 1.89[42]
HATS-23b 1.86[42]
KELT-8b 1.86[42]
WASP-76b 1.83[44]
HAT-P-33b 1.827[42]
WASP-121b 1.81[44]
TrES-4 1.799[45]
KELT-12b 1.79[41]
HATS-26b 1.75[42]
WASP-12b 1.736[44]
HAT-P-46b 1.73[42]
WASP-94 Ab 1.72[44]
KELT-4Ab 1.706[41]
WASP-79b 1.7[42]
WASP-78b 1.7[44]
1RXS 1609b 1.7[42]
WASP-88b 1.7[44]
Kepler-12b 1.695[42]
Kepler-447b 1.65
beta Pic b 1.65
OGLE2-TR-L9b 1.614[41]
PSO J318.5-22 1.53
WASP-103b 1.528
Kepler-13b 1.51[41]
HAT-P-8b 1.5
WASP-71b 1.5
Kepler-854b 1.5
WASP-33b 1.497
Kepler-7b 1.478
Kepler-5b 1.431
Kepler-8b 1.419
TrES-3 1.341
XO-4b 1.34
TrES-2b 1.272
OGLE-TR-10b 1.26
Kepler-39b 1.22 One of the most massive exoplanets known.
Kepler-418b 1.2
Kappa And b 1.2
OGLE-TR-182b 1.13
Jupiter 69,911  km [46] Largest planet in the Solar System, by radius and mass.[47]
Reported for reference

Timeline of largest exoplanet recordholders[edit]

Planet Size (RJ) Date Notes
CT Cha b 2.037 2013- Some planets, like HD 100546 b, might be larger, but their status as a brown dwarf is unconfirmed. There should be no planet with a diameter of 720,000 km or more.
WASP-17b 1.991 2012—2013
WASP-12b 2.15 to 1.83 2009—2012
TRES-4b 1.799 2007—2009 This planet has a density of 0.2 g/cm3, about that of balsa wood, less than Jupiter's 1.3g/cm3 It was succeeded by WASP-17b as the largest exoplanet.[48][49]
HD 209458 b 1.35 —2007 This was the first exoplanet whose size was determined.[50]


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  1. for Case I in paper page 6, others range from 1.41 to 2.07 Jupiter radii.
<comments />
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