List of largest exoplanets

Below is a list of the largest exoplanets so far discovered, in terms of physical size, ordered by radius. The exoplanets with sizes higher than 1.5 jupiter radii are included.


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.

This list is incomplete; you can help by expanding it.
Exoplanet Radius (RJ)
(Jupiter = 1)
HD 100546 b 6.9[1] The largest exoplanet. The planet's size puts it near the border between a giant planet and a brown dwarf.
GQ Lup b 3.0[1]
ROXs 42Bb 2.5
CT Cha b ~2.29 CT Cha b is larger with ~2.29 Jupiter radii, but may be a brown dwarf
WASP-79 b 2.09[2]
HAT-P-32b 2.037
WASP-17b 1.991 Was the largest known planet in 2012.
51 Peg b 1.900
WASP-121 b 1.865
KELT-8 b 1.860
KOI-368.01 1.830
WASP-76 b 1.830
HAT-P-33b 1.827
TrES-4 1.799
WASP-12b 1.790 Was the largest planet in 2009
WASP-78 b 1.75
HAT-P-40 b 1.73
WASP-94 A b 1.72
1RXS 1609 b 1.7
WASP-88 b 1.7
Kepler-12b 1.695
WASP-100 b 1.69
HAT-P-41 b 1.685
WASP-48 b 1.67
WASP-82 b 1.67
Kepler-447b 1.65
beta Pic b 1.65
WASP-90 b 1.63
OGLE2-TR-L9 b 1.61
HAT-P-39 b 1.571
WASP-74 b 1.56
WASP-31 b 1.537
KELT-7 b 1.533
WASP-103 b 1.528
KOI-13 b 1.512[3]
HAT-P-8 b 1.5
WASP-71 b 1.5
The following well-known exoplanets are listed for the purpose of comparison.
Exoplanet Radius (RJ)
(Jupiter = 1)
WASP-33 b 1.497
Kepler-7b 1.478
Kepler-5b 1.431
Kepler-8b 1.419
TrES-3 1.341
XO-4 b 1.34
TrES-2b 1.272
OGLE-TR-10 b 1.26
Kepler-39b 1.22 One of the most massive exoplanets known.
Kepler-418 b 1.2
Kappa And b 1.2
OGLE-TR-182 b 1.13
Jupiter 69,911 km [4] Largest planet in the Solar System, by radius and volume.[5]
Reported for reference

Timeline of largest exoplanet recordholders

Planet Size (RJ) Date Notes
HD 100546 b 6.9 2015
HAT-P-32b 2.02 20132015 CT Cha b may be larger at over ~2.29 Jupiter radii, but its status as a planet or brown dwarf is unconfirmed.
WASP-17b 1.991 20122013
WASP-12b 1.83 20092012
TRES-4b 1.67 20072009 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.[6][7]
HD 209458 b 1.3 2007 This was the first exoplanet whose size was determined.[8]

See also


  1. 1 2 NASA. "Confirmed Planets". NASA Website. NASA Exoplanet Archive.
  2. "WASP Planets". SuperWASP. Retrieved 2016-01-26.
  4. Elizabeth Howell (21 April 2014). "The Planets in Our Solar System in Order of Size". Universe Today.
  5. Jerry Coffey (8 July 2008). "What is the Biggest Planet in the Solar System?". Universe Today.
  6. Ker Than (6 August 2007). "Largest Known Exoplanet Discovered".
  7. California Institute of Technology (6 August 2007). "Keck Confirms Largest Exoplanet To Date". W.M. Keck Observatory.
  8. Laurance R. Doyle, Hans-Jörg Deeg, Timothy M. Brown (September 2000). "Searching for Shadows of Other Earths" (PDF). Scientific American: 59–65. doi:10.1038/scientificamerican0900-58. PMID 10976467.
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