List of extrasolar planet extremes

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The following are lists of extremes among the known extrasolar planets. The properties listed here are those for which values are reliably known for the majority of the known sample of extrasolar planets, thus extremes of properties such as radius and temperature are not listed.

[edit] Planetary characteristics

Title Planet Star Notes
Most distant OGLE-2005-BLG-390Lb OGLE-2005-BLG-390L 21,500 ± 3,300 light years
Note: A controversial microlensing event of lobe A of the double gravitational lens Q0957+561 suggests that there is a planet in the lensing galaxy lying at redshift 0.355 (7.8 Gly).
Least distant Epsilon Eridani b Epsilon Eridani 10.4 light years
Shortest orbital period OGLE-TR-56b OGLE-TR-56 1.2 days
Note: SWEEPS-10 (awaiting confirmation) has an orbital period of 0.424 days (10.2 hours).
Most eccentric orbit HD 80606 b HD 80606 eccentricity of 0.9349
Least eccentric orbit HD 209458 b HD 209458 eccentricity of 0.001
Most inclined orbit HAT-P-2b HD 147506 inclination 90°
Smallest orbit Gliese 876 d Gliese 876 0.021 AU
Note: SWEEPS-10 (awaiting confirmation) has an orbital distance of 0.008 AU (1.2 million km).
Least massive PSR B1257+12 A PSR B1257+12 0.02 MEarth
Note 1: the mass of PSR B1257+12 A is based on an assumption of coplanarity with the outer two planets. The least massive planet for which a true mass is known is PSR B1257+12 C with a mass 3.9 times that of the Earth.
Note 2: PSR B1257+12 system may include possible asteroidal object, but it is possibly not massive enough to qualify as a planet
Note 3: The low mass cut-off for an exoplanet is currently undefined

[edit] Stellar characteristics

Title Star Planets Notes
Lowest Metalicity HD 155358

HD 155358 b
HD 155358 c

 −0.68 dex
Note: Planets are thought to preferentially form from nebulæ with a metal-rich composition. The lowest metalicity star about which planets can form is thus important to formation models and future planet searches.

[edit] See also