List of exoplanet extremes
Planetary characteristics

List of exoplanet extremes

Section Title: Planetary characteristics
Table Section Text: None

Title	Planet	Star	Data	Notes

Most massive	HR 2562 b	HR 2562	30±15 Jupiter masses	Most massive planet in the NASA Exoplanet Archive although, according to most definitions of planet, it may be too massive to be a planet, and may be a brown dwarf instead.

Least massive	PSR B1257+12 A	PSR B1257+12	≥0.02 MEarth	Mass of PSR B1257+12 A is based on an assumption of coplanarity with the outer two planets. The least massive exoplanet for which a true mass is known is Kepler-138b, at 0.07 M⊕.

Largest radius	GQ Lupi b	GQ Lupi	3.0 ± 0.5 Jupiter radii	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.

Smallest radius	KOI 115.03	Kepler-105	0.0258 Earth radii

Most dense	KELT-1 b	KELT-1	23.7 g/cm3

Least dense	Kepler-453b	Kepler-453	0–0.7 g/cm3	The density of Kepler-453b has not been accurately measured, and it has a radius of 6.204 Re

Hottest	Kepler-70b	Kepler-70	>7,000 K

Coldest	OGLE-2005-BLG-390Lb	OGLE-2005-BLG-390L	50 K

Highest albedo	Kepler-10b	Kepler-10	0.5–0.6 (geometric albedo)

Lowest albedo	TrES-2b	GSC 03549-02811	Geometric albedo < 1%	Best-fit model for albedo gives 0.04% (0.0004)

Youngest	Proplyd 133-353	Proplyd 133-353	0.5 Myr

Oldest	PSR B1620-26 b	PSR B1620-26	13 Gyr	Orbits in a circumbinary orbit around two stellar remnants – a pulsar and a white dwarf. Kapteyn b is the oldest potentially habitable exoplanet at 11 Gyr.

Sentence(s)

HR 2562 b is listed as the most-massive exoplanet in NASA's exoplanet archive, despite having a mass (30±15 MJ), and it may be a brown dwarf instead.

final_sentence: HR 2562 b is listed as the most-massive exoplanet in NASA's exoplanet archive, despite having a mass (30±15 MJ), and it may be a brown dwarf instead.