Planet K2-138 c

Name K2-138 c
Planet Status Confirmed
Discovered in 2018
Mass
Mass*sin(i)
Semi-Major Axis 0.04454 (± 0.00032) AU
Orbital Period 3.55987 ( -0.00022 +0.00023 ) day
Eccentricity 0.0 ( -0.0 +0.296 )
ω
Tperi
Radius 0.225 ( -0.014 +0.03 ) RJ
Inclination 87.5 ( -3.3 +1.8 ) deg
Update 2018-02-20
Detection Method Primary Transit
Mass Detection Method
Radius Detection Method Primary Transit
Primary transit 2457740.3223 ( -0.0027 +0.0025 ) JD
Secondary transit
λ
Impact Parameter b 0.47 (± 0.32)
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