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.


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 that are smaller than 1.7 RJ have been included for comparison.

Exoplanet name Radius (RJ)
(Jupiter = 1)
Sun 9.95[1][2]
(1,391,400 km)
The largest object in the Solar System.
Reported for reference
HD 100546 b's surrounding disk 6.9+2.7
Largest exoplanet in the NASA Exoplanet Archive, although it may not be considered the largest exoplanet as the true size of this planet is undetermined as flux from planet and disk are superimposed and the emitting area has this size, composed of planet and including disk, not to be mistaken as single planet radius. Over time, it will shrink to the size of Jupiter. 20 MJ; is likely a brown dwarf.
GQ Lupi b 4.6±1.4,[4] 3.0[5]–6.5[4] Currently the largest exoplanet discovered. 1 - 36 MJ; at the highest end of this range, it may be classified as a young brown dwarf.
DH Tauri b 2.7±0.8[4] 11+10
MJ; at its largest, it would be classified as a brown dwarf
ROXs 42Bb 2.5[6] This massive hot jupiter (9+6
MJ) varies from 0.9 RJ to 3 RJ.[6]
OTS 44 2.3[7]–5.7[8] Very likely a sub-brown dwarf, which it may be the lowest-mass free-floating substellar objects. It is surrounded by a circumstellar disk of dust and particles of rock and ice
Kepler-13 Ab (KOI-13b) 2.216±0.087[9] Lisa et al gives also radii of 1.512±0.035 RJ and 2.63+1.04
 RJ. Natalie et al calculate 2.03 RJ.[10]
CT Chamaeleontis b 2.2+0.81
17 MJ; is likely a brown dwarf.
KOI-368.01 2.1±0.2[12]
WASP-79b 2.09±0.14[13]
HAT-P-67b 2.085+0.096
MJ; a very puffy Hot Jupiter
XO-6b 2.07±0.22[15] 4.4 MJ; a very puffy Hot Jupiter
HAT-P-32b 2.037±0.999[15] 0.941 (± 0.166) MJ; a very puffy Hot Jupiter. Other estimates give 1.789±0.025 RJ.[16]
KOI-3681.01 2.0+0.7
Orbits fairly close to its 1.1+0.2
M star, with 217 day-long years.
WASP-17b 1.991+0.08
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.[17]
Kepler-435b 1.99±0.18[18]
KOI-680 b 1.99[12]
KELT-19 Ab 1.91[19]
CVSO 30b 1.91[20]
51 Pegasi b (Bellerophon) 1.9±0.3[21] First exoplanet to be discovered orbiting a main-sequence star. Prototype hot Jupiters.
WASP-12b ("Pitch black") 1.900+0.057
,[22] 1.736±0.056[23]
This planet is so close to its parent star that its tidal forces are distorting it into an egg shape. As of September 2017, it has been described as "black as asphalt", and as a "pitch black" hot Jupiter as it absorbs 94% of the light that shines on its surface.
KELT-9b 1.891+0.061
One of the hottest exoplanets known.
HAT-P-65b 1.89±0.13[25]
WASP-121b 1.865±0.044[26]
KELT-8b 1.86+0.18
HATS-23b 1.86+0.3
WASP-76b 1.83+0.06
HAT-P-33b 1.827±0.29[30]
Cha 110913-773444 1.8[31] A rogue planet (Likely a sub-brown dwarf) that is surrounded by a protoplanetary disk. It is one of youngest free-floating substellar objects with 0.5–10 Myr.
TrES-4 1.799±0.063[32] 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[33]
KELT-12b 1.78+0.17
HATS-26b 1.75±0.21[35]
KELT-14b 1.743±0.047[33]
KELT-20b 1.735+0.07
HAT-P-40b 1.730±0.062[37]
WASP-94 Ab 1.72+0.06
KELT-4 Ab 1.706+0.085
WASP-88b 1.7+0.13
WASP-78b 1.70±0.04[13]
1RXS 1609b 1.7[41] 14+2.0
MJ; is likely a brown dwarf.

A few additional examples with radii lower than 1.7 RJ.

Exoplanet name Radius (RJ)
(Jupiter = 1)
Kepler-12b 1.695+0.032
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.
WASP-71b 1.5
Kepler-7b 1.478
HD 209458 b 1.35 The first exoplanet whose size was determined.
TrES-2b (Kepler-1b) 1.272 Darkest known exoplanet due to an extremely low geometric albedo. It absorbs 99% of light.
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 [43] Largest planet in the Solar System, by radius and mass.[44]
Reported for reference

Timeline of largest exoplanet recordholders[edit]

Planet Size (RJ) Date Notes
GQ Lupi b 3.0[5] 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.[45][46]
HD 209458 b 1.35 —2007 This was the first exoplanet whose size was determined.[47]

See also[edit]


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