List of largest exoplanets

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Image of the outer dust around the young star HD 100546. The position of HD 100546 b was indicated by an orange dot.

Below is a list of the largest exoplanets so far discovered, in terms of physical size, ordered by radius.

List[edit]

The sizes are listed in units of Jupiter radii (RJ, R). All planets listed are larger than two times the size of the largest planet in the Solar System, Jupiter. Some planets smaller than 1.7 RJ have been included for comparison.

Exoplanet name Radius (RJ)
(Jupiter = 1)
Notes
HD 100546 b 6.9+2.7
−2.9
[1]
Currently cannot be hailed as the largest exoplanet as the emitting area has this size, composed of planet and including disk, not to be mistaken as single planet radius. Over time, the planet will shrink to the size of Jupiter but it is possible that it will become larger. 20 MJ; is likely a brown dwarf.
GQ Lup b 3.0±0.5[2] Currently the largest exoplanet discovered. 1-36 MJ; possibly a brown dwarf.
DH Tauri b 2.7±0.8[3]
ROXs 42Bb 2.5[4]
OTS 44 2.3[5]–5.7[6] Very likely a sub-brown dwarf, which it may be the lowest-mass free-floating substellar objects. It is surounded a circumstellar disk of dust and particles of rock and ice
CT Cha b 2.2+0.81
−0.6
[7]
17 MJ; is likely a brown dwarf.
KOI-368.01 2.1±0.2[8]
WASP-79b 2.09±0.14[9] One of the hottest exoplanets known.
HAT-P-67b 2.085+0.096
−0.071
[10]
0.34+0.25
−0.19
MJ; a very puffy Hot Jupiter
XO-6b 2.07±0.22[11] 4.4 MJ; a very puffy Hot Jupiter
HAT-P-32b 2.037±0.999[12] 0.941 (± 0.166) MJ; a very puffy Hot Jupiter. Other estimates give 1.789±0.025 RJ.[13]
KOI-3681.01 2.0+0.7
−1
[8]
Orbits fairly close to its 1.1+0.2
−0.2
M star, with 217 day-long years.
WASP-17b 1.991+0.08
−0.58
[14]
Was the largest known planet in 2012. At only 0.486 MJ, this Hot Jupiter is extremely low density. This estimate gives also a range from 1.411 RJ to 2.071 RJ.[14]
Kepler-435b 1.99±0.18[15]
KOI-680 b 1.99[8]
KELT-19 Ab 1.91[16]
CVSO 30b 1.91[17]
51 Pegasi b (Bellerophon) 1.9±0.3[18] First exoplanet to be discovered orbiting a main-sequence star. Prototype hot Jupiters.
WASP-12b ("Pitch black") 1.900+0.057
−0.055
[19], 1.736±0.056[20]
KELT-9b 1.891+0.061
−0.055
[21]
One of the hottest exoplanets known.
HAT-P-65b 1.89±0.13[22]
WASP-121b 1.865±0.044[23]
KELT-8b 1.86+0.18
−0.16
[24]
HATS-23b 1.86+0.3
−0.4
[25]
WASP-76b 1.83+0.06
−0.04
[26]
HAT-P-33b 1.827±0.29[27]
Cha 110913-773444 1.8–2.1[28] A rogue planet (May be a sub-brown dwarf) that is surrounded by a protoplanetary disk.
TrES-4 1.799±0.063[29] This planet has a density of 0.2 g/cm3, about that of balsa wood, less than Jupiter's 1.3g/cm3
WASP-122b 1.792±0.069[30]
KELT-12b 1.78+0.17
−0.16
[31]
HATS-26b 1.75±0.21[32]
KELT-14b 1.743±0.047[33]
KELT-20b 1.735+0.07
−0.075
[34]
HAT-P-40b 1.730±0.062[35]
WASP-94 Ab 1.72+0.06
−0.05
[36]
KELT-4 Ab 1.706+0.085
−0.076
[37]
WASP-88b 1.7+0.13
−0.07
[38]
WASP-78b 1.70±0.04[9]
1RXS 1609b 1.7[39] 14+2.0
−3.0
MJ; is likely a brown dwarf.

A few additional examples with masses lower than 1.7 RJ.

Exoplanet name Radius (RJ)
(Jupiter = 1)
Notes
Kepler-12b 1.695+0.032
−0.032
[40]
beta Pic b 1.65
PSO J318.5-22 1.53 A rogue planet, which is an extrasolar object of planetary mass that does not appear to have a host star.
Kepler-13b 1.51[8]
WASP-71b 1.5
Kepler-7b 1.478
HD 209458 b 1.35 The first exoplanet whose size was determined.
TrES-3 1.341
Kepler-39b 1.22 One of the most massive exoplanets known.
HR 2562 b 1.11 Most massive planet with a mass of 30 MJ, although according to most definitions of planet, it may be too massive to be a planet, and may be a brown dwarf instead.
Jupiter 69,911 km [41] Largest planet in the Solar System, by radius and mass.[42]
Reported for reference

Timeline of largest exoplanet recordholders[edit]

Planet Size (RJ) Date Notes
GQ Lupi b 3.0[2] 2015— The emitting area of the extremely young HD 100546 b, including planet and disk, indicates that there is a large amount of heat left from formation. Over time, the planet will shrink to approximately the size of Jupiter. This candidate could be larger.
HAT-P-32b 2.037 2013—2015 CT Cha b may be larger at 2.2 Jupiter radii, but its status as a planet or brown dwarf is unconfirmed.
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.[43][44]
HD 209458 b 1.35 —2007 This was the first exoplanet whose size was determined.[45]

See also[edit]

References[edit]

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