List of Extrasolar Planet Extremes - Planetary Characteristics

Planetary Characteristics

Title Planet Star Data Notes
Least massive PSR B1257+12 A PSR B1257+12 0.02 MEarth

The mass of PSR B1257+12 A is based on an assumption of coplanarity with the outer two planets.
It may be an asteroidal object, i.e. possibly not massive enough to qualify as a planet. (However, no low mass cut-off for an exoplanet is currently defined.)
Biggest radius HAT-P-32b HAT-P-32 2.04 Jupiter radii
Smallest radius Kepler-42d Kepler-42 0.57 Earth radii
Most dense PSR J1719-1438 b PSR J1719-1438 ~ 23 g/cm3
(~ 23,000 kg/m3)		 This "planet" is thought to be the remnant inner core of a degraded star. It is 4x denser than the Earth, the densest known planet previously.
Least dense WASP-17b WASP-17 80–185 kg/m3
Lowest albedo TrES-2b GSC 03549-02811 Geometric albedo < 1% Best-fit model for albedo gives even 0.04%

Read more about this topic:  List Of Extrasolar Planet Extremes

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