Planet K2-138 b

Name K2-138 b
Planet Status Confirmed
Discovered in 2018
Mass
Mass*sin(i)
Semi-Major Axis 0.0338 (± 0.00024) AU
Orbital Period 2.35322 (± 0.00036) day
Eccentricity 0.0 ( -0.0 +0.403 )
ω
Tperi
Radius 0.14 ( -0.015 +0.025 ) RJ
Inclination 86.9 ( -4.6 +2.2 ) deg
Update 2018-02-20
Detection Method Primary Transit
Mass Detection Method
Radius Detection Method
Primary transit 2457773.317 ( -0.0038 +0.0037 ) JD
Secondary transit
λ
Impact Parameter b 0.5 ( -0.34 +0.33 )
Time Vr=0
Velocity Semiamplitude K
Calculated temperature
Measured temperature
Hottest point longitude
Geometric albedo
Surface gravity log(g/gH)
Alternate Names

Star

K2-138
Name K2-138
Distance 183.0 (± 17.0) pc
Spectral type K1V
Apparent magnitude V 12.21
Mass 0.93 (± 0.06) MSun
Age
Effective temperature 5378.0 (± 60.0) K
Radius 0.86 (± 0.08) RSun
Metallicity [Fe/H] 0.16 (± 0.04)
Detected Disc
Magnetic Field
RA2000 23:15:47.8
Dec2000 -10:50:59
Alternate Names EPIC 245950175, 2MASS J23154776-1050590
Planetary system
5 planets

More data

Observability Predictor

Remarks

February 2018 : K2-138 is the first exoplanet discovery by citizen scientists participating in the Exoplanet Explorers project on the Zooniverse platform.

Related publications

The K2-138 System: A Near-Resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists
2018 CHRISTIANSEN J., CROSSFIELD I., BARENTSEN G., LINTOTT Ch., BARCLAY Th. et al.
Astron. J., 155, 57
paper  arxiv