Planet K2-18 b

Detailed information about planet K2-18 b and its parameters.

Planet

Name
K2-18 b
Planet Status
Confirmed
Discovered in
2015
Update
2024-09-11
Mass
Mass*sin(i)
Semi-Major Axis
Orbital Period
Eccentricity
ω
Tperi
Radius
Inclination
89.5785 ( +0.0079 -0.0088 ) deg
Detection Method
Primary Transit
Mass Meas. Method
Theoretical
Radius Meas. Method
Primary Transit
Primary transit
2457264.39144 ( ± 0.00065 ) JD
Secondary transit
λ
Impact Parameter b
Time Vr=0
Velocity Semiamplitude K
3.55 ( +0.57 -0.58 ) m/s
Calculated temperature
Measured temperature
Hottest point longitude
Geometric albedo
Surface gravity log(g/gH)
Alternate Names
EPIC 201912552 b, 2MASS J11301450+0735180 b, EPIC 201912552.01, WISE J113014.45+073516.8 b
Data Source Type Result Value Result Figure Notes Reference
Molecule Data Source Type Result Value Result Figure Notes Reference
CH4
Measurements Detected 2023 - MADHUUDHAN N.
Measurements Detected 2020 - MADHUSUDHAN N.
CO
Measurements Detected 2024 - LUU C.
CO2
Measurements Detected 2024 - LUU C.
Measurements Detected 2023 - MADHUUDHAN N.
H2O
Measurements Detected 2020 - MADHUSUDHAN N.
Measurements Detected 2019 - BENNEKE B.
Measurements Detected 2019 - TSIARAS A.
NH3
Measurements Detected 2024 - LUU C.
Measurements Detected 2020 - MADHUSUDHAN N.

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Star

Name
K2-18
Distance
38.07 ( +0.08 -0.08 ) pc
Spectral type
M2.5 V
Apparent magnitude V
13.5
Mass
0.36 ( +0.05 -0.05 ) MSun
Age
Effective temperature
3457.0 ( +39.0 -39.0 ) K
Radius
0.41 ( +0.04 -0.04 ) RSun
Metallicity [Fe/H]
0.12 ( +0.16 -0.16 )
Detected Disc
Magnetic Field
RA2000
11:30:14.5
Dec2000
+07:35:18.2
Alternate Names
EPIC 201912552, 2MASS J11301450+0735180, WISE J113014.45+073516.8

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