K2-141b

K2-141b
Discovery
Discovery site	Kepler Space Observatory
Discovery date	2018
Detection method	Transit
Orbital characteristics
Semi-major axis	0.00716 +0.00055; −0.00065 AU ; (1,071,000 +82,000; −97,000 km)
Eccentricity	0
Orbital period (sidereal)	0.2803244 ± 0.0000015 d (24,220.03 ± 0.13 s; 6.727786 ± 3.6×10−5 h)
Inclination	86.3 +2.7; −3.6
Star	K2-141
Physical characteristics
Mean radius	1.51±0.05 R🜨
Mass	5.08±0.41 ME
Mean density	8.2 ± 1.1 g/cm3 (4.74 ± 0.64 oz/cu in)
Surface gravity	2.23 +0.35; −0.31 g
Albedo	~0.28±0.07
Temperature	2,039 K (1,766 °C) (equilibrium) ; 3,270 K (3,000 °C) (day side) ; 73 K (−200.2 °C) (night side)

K2-141b (also designated EPIC 246393474.01) is a massive rocky exoplanet orbiting extremely close to a K Type orange main-sequence star K2-141. The planet was first discovered by the Kepler space telescope during its K2 “Second Light” mission and later observed by the HARPS-N spectrograph. It is classified as an Ultra-short Period (USP) and is confirmed to be terrestrial in nature. Its high density implies a massive iron core taking up between 30% and 50% of the planet's total mass.^[3]

^ ^a ^b ^c ^d ^e ^f ^g ^h "K2-141 b CONFIRMED PLANET OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2018-03-05.
^ Cite error: The named reference academic.oup.com was invoked but never defined (see the help page).
^ Cite error: The named reference Malavolta2018 was invoked but never defined (see the help page).

[NasaExoplanetArchive-1] ^ ^a ^b ^c ^d ^e ^f ^g ^h "K2-141 b CONFIRMED PLANET OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2018-03-05.

[academic.oup.com-2] Cite error: The named reference academic.oup.com was invoked but never defined (see the help page).

[Malavolta2018-3] Cite error: The named reference Malavolta2018 was invoked but never defined (see the help page).

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