List of extrasolar planet extremes Totally Explained

Everything about List Of Extrasolar Planet Extremes totally explained

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.

Planetary characteristics

Title	Planet	Star	Notes
Most distant	OGLE-2005-BLG-390Lb	OGLE-2005-BLG-390L	21,500 ± 3,300 light years ť Note: A controversial microlensing event of lobe A of the double gravitational lens Q0957+561 suggests that there's 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 ť 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 ť 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 M_Earth ť 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's possibly not massive enough to qualify as a planet ť Note 3: The low mass cut-off for an exoplanet is currently undefined

Stellar characteristics

Title	Star	Planets	Notes
Lowest Metalicity	HD 155358	HD 155358 b HD 155358 c	−0.68 dex ť 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.

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