Astronomy: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.

Caveats

This list of extrasolar objects may and will change over time because of inconsistency between journals, different methods used to examine these objects and the already extremely hard task of discovering exoplanets, or any other large objects for that matter. Then there is the fact that these objects might be brown dwarfs, sub-brown dwarfs, or not exist at all. Because of this, this list only cites the best measurements to date and is prone to change. Remember, these objects are not stars, and are quite small on a universal or even stellar scale.

List

The sizes are listed in units of Jupiter radii (71,492 km). All planets listed are larger than 1.7 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 the sake of comparison.

Key
Probably brown dwarfs (based on mass)
Probably planets (based on mass)
Image Exoplanet name Radius ([[Astronomy:Jupiter radius J}}}}}}]]) Notes
Artist's impression of a gas giant planet forming in the disc around the young star HD 100546.jpg HD 100546 b 6.9+2.7−2.9[1]3.0038 (true) Largest exoplanet in the NASA Exoplanet Archive, although because of flux from the planet and the disk that are superimposed, the exact size of this planet cannot be determined and the emitting area has this size, composed of the planet and most likely its disk too, and is not to be mistaken as a single planet radius. Over time, it will shrink to the size of Jupiter. Possessing 60 MJ,[2] it is likely a brown dwarf.
First ever image of a multi-planet system around a Sun-like star.tif TYC 8998-760-1 b 3.0[3] On 22 July 2020, astronomers announced images, for the first-time, of multiple exoplanets orbiting a star, TYC 8998-760-1, nearly identical to the Sun, except for age. TYC 8998-760-1 is only 14 Ma old while the Sun is 4,500 Ma.[4][5]
DH Tauri b 2.6±0.7- 2.7±0.8[6]2.68[7] 14.2 MJ; at its largest, it would be classified as a brown dwarf.[7]
ROXs42Bb image.jpeg ROXs 42Bb 2.5[8] This massive hot Jupiter (9+6−3 MJ) varies from 0.9 RJ to 3 RJ.[8]
Brown dwarf OTS 44 with disc.jpg OTS 44 2.24[9]–5.55[10] Very likely a brown dwarf[9] or sub-brown dwarf,[10] which it may be the least massive free-floating substellar objects. It is surrounded by a circumstellar disk of dust and particles of rock and ice.
Exoplanet Comparison CT Chamaeleontis b.png CT Chamaeleontis b 2.2+0.81−0.6[11] 17 MJ; is likely a brown dwarf.
KOI-368.01 2.1±0.2[12] Controversial[13]
HAT-P-67b 2.085+0.096−0.071[14] 0.34+0.25−0.19 MJ; a very puffy Hot Jupiter
XO-6b 2.07±0.22[15] 4.4 MJ; a very puffy Hot Jupiter
HAT-P-41b 2.05±0.50[16] 1.19 MJ; a very puffy Hot Jupiter
PDS70c-CircumplanetaryDisk-20190711.jpg PDS 70 c 2.04+0.61
−0.45
[16]
2 MJ
HIP 65 Ab 2.03+0.61
−0.49
[16]
3.213 MJ; a very puffy Hot Jupiter
Kepler-435b.png Kepler-435b 1.99±0.18[17]
HAT-P-32b 1.980±0.045,[16] 2.037±0.999[15] 0.941 (± 0.166) MJ; a very puffy Hot Jupiter. Other estimates give 1.789±0.025 RJ.[18]
PDS 70 b 1.93+0.26−0.08 - 2.72+0.39−0.34[19]
KELT-19 Ab 1.91±0.11[20]
Artist impression of the exoplanet 51 Pegasi b.jpg 51 Pegasi b (Dimidium/Bellerophon) 1.9±0.3[21] First exoplanet to be discovered orbiting a main-sequence star. Prototype hot Jupiter.
The Pitch-Black Exoplanet WASP-12b.jpg WASP-12b 1.900+0.057−0.055,[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.
Artist's impression of KELT-9b orbiting KELT-9.jpg KELT-9b 1.891+0.061−0.055[24] One of the hottest exoplanets known.
HAT-P-65b 1.89±0.13[25]
TOI-1518 b 1.875±0.053[16] <2.3 MJ
Exoplanet Comparison WASP-17 b.png WASP-17b (Ditsö̀) 1.87±0.24,[16] 1.991+0.08−0.58[26] 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.[26]
HAT-P-70b 1.87+0.15
−0.10
[16]
<6.78 MJ
WASP-121b 01.jpg WASP-121b 1.865±0.044[27]
HATS-23b 1.86+0.3−0.4[28]
CFHTWIR-Oph 98 b 1.86±0.05[16] 7.8 MJ
WASP-76 b (2020).png WASP-76b 1.83+0.06−0.04[29] The tidally-locked planet where winds move 18,000 km/h, and where molten iron rains from the sky due to daytime temperatures exceeding 2,400 °C (4,350 °F).[30][31]
HAT-P-33b 1.827±0.29,[32] 1.85±0.49[16]
WASP-178b 1.81±0.09[16] 1.66 MJ
The Sub-Stellar Companion to GQ Lupi.jpg GQ Lupi b 1.8,[33] 3.0±0.5,[16] 4.6 - 6.5[6] 21.5 MJ; at the highest end of this range, it may be classified as a young brown dwarf.
WISE1109-7734 (with marker, edited).png Cha 110913-773444 1.8[34] 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.
GSC 06214-00210 b 1.8±0.5[16] 16 MJ, likely brown dwarf
WASP-122b 1.792±0.069[35]
KELT-12b 1.78+0.17−0.16[36]
TOI-640 b 1.771+0.060
−0.056
[16]
0.88 MJ
HATS-26b 1.75±0.21[37]
KELT-14b 1.743±0.047[35]
KELT-15b 1.74±0.20[16] 1.31 MJ
HAT-P-57b 1.74±0.36[16] 1.41 MJ
KELT-20b 1.735+0.07−0.075,[38] 1.741+0.069
−0.074
[16]
HAT-P-64b 1.703±0.070[16] 0.58 MJ
WASP-78b 1.70±0.04,[39] 1.93±0.45[16]
Qatar-7b 1.70±0.03[16] 1.88 MJ
A few additional examples with radii lower than 1.7 [[Astronomy:Jupiter radius J}}}}}}]].
KELT-4Ab 1.699+0.046
−0.045
,[16] 1.706+0.085−0.076[40]
Kepler-12b 1.695+0.032−0.032,[41] 1.754+0.031
−0.036
[16]
WASP-79b (Pollera) 1.67±0.15,[16] 2.09±0.14[39]
1RXS 1609b 1.664,[16] 1.7[42] 14+2.0−3.0 MJ; is likely a brown dwarf.
Artist’s impression of the planet Beta Pictoris b.jpg Beta Pictoris b 1.65 Likely the second most massive object in its namesake system.
KELT-8b 1.62±0.10,[16] 1.86+0.18−0.16[43]
Exoplanet Comparison TrES-4 b.png TrES-4b 1.61±0.18,[16] 1.799±0.063[44] This planet has a density of 0.2 g/cm3, about that of balsa wood, less than Jupiter's 1.3g/cm3.
WASP-94 Ab 1.58±0.13,[16] 1.72+0.06−0.05[45]
PSO J318.5-22 image from the Pan-STARRS1 telescope.png PSO J318.5−22 1.53 An extrasolar object that does not seem to be orbiting any stellar mass, see: rogue planet.
HAT-P-40b (Vytis) 1.52±0.17,[16] 1.730±0.062[46]
Kepler-13 Ab (KOI-13b) 1.512±0.035,[16] 2.216±0.087[47] Esteves et al. gives also radii of 1.512±0.035 RJ and 2.63+1.04−0.82 RJ. Batalha et al. calculate 2.03 RJ.[48]
Exoplanet Comparison Kepler-7 b.png Kepler-7b 1.478
WASP-88b 1.46±0.21,[16] 1.7+0.13−0.07[49]
HD 209458 b.png HD 209458 b 1.35 The first exoplanet whose size was determined. Named after a prominent Egyptian deity, 'Osiris'.
Jkv.TrES-2b.png 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 New Horizons.jpg Jupiter 1

69,911 km[50]

Largest planet in the Solar System, by radius and mass.[51]
Reported for reference

See also

References

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