Planet K2-138 g

Detailed information about planet K2-138 g and its parameters.

Planet parameters Publications Observability Predictor

Planet

Name

K2-138 g

Planet Status

Confirmed

Discovered in

2018

Update

2019-10-01

Mass

0.0135 (\begin{matrix} + 0.0167 \\ - 0.009 \end{matrix})

M_J 1 publication

Exoplanet characterisation in the longest known resonant chain: the K2-138 system seen by HARPS

Mass*sin(i)

—

Semi-Major Axis

0.231 (\begin{matrix} + 0.00154 \\ - 0.00196 \end{matrix})

AU 1 publication

Exoplanet characterisation in the longest known resonant chain: the K2-138 system seen by HARPS

Orbital Period

41.96797 (\begin{matrix} + 0.00843 \\ - 0.00725 \end{matrix})

day 1 publication

Exoplanet characterisation in the longest known resonant chain: the K2-138 system seen by HARPS

Eccentricity

0.059 (\begin{matrix} + 0.063 \\ - 0.04 \end{matrix})

1 publication

Exoplanet characterisation in the longest known resonant chain: the K2-138 system seen by HARPS

ω

164.0 (\begin{matrix} + 92.0 \\ - 72.0 \end{matrix})

deg 1 publication

Exoplanet characterisation in the longest known resonant chain: the K2-138 system seen by HARPS

T_peri

—

Radius

0.2688 (\begin{matrix} + 0.027 \\ - 0.0223 \end{matrix})

R_J 1 publication

Exoplanet characterisation in the longest known resonant chain: the K2-138 system seen by HARPS

Inclination

89.4 (\begin{matrix} + 0.4 \\ - 0.3 \end{matrix})

deg 1 publication

Exoplanet characterisation in the longest known resonant chain: the K2-138 system seen by HARPS

Detection Method

Primary Transit

Mass Meas. Method

Spectrum

Radius Meas. Method

Primary Transit

Primary transit

2457773.86156 (\begin{matrix} + 0.01863 \\ - 0.03219 \end{matrix})

JD 1 publication

Exoplanet characterisation in the longest known resonant chain: the K2-138 system seen by HARPS

Secondary transit

—

λ

—

Impact Parameter b

0.56 (\begin{matrix} + 0.28 \\ - 0.36 \end{matrix})

1 publication

Exoplanet characterisation in the longest known resonant chain: the K2-138 system seen by HARPS

Time V_r=0

—

Velocity Semiamplitude K

0.83 (\begin{matrix} + 1.0 \\ - 0.58 \end{matrix})

m/s 1 publication

Exoplanet characterisation in the longest known resonant chain: the K2-138 system seen by HARPS

Calculated temperature

518.0 (\begin{matrix} + 20.0 \\ - 13.0 \end{matrix})

K 1 publication

Exoplanet characterisation in the longest known resonant chain: the K2-138 system seen by HARPS

Measured temperature

—

Hottest point longitude

—

Geometric albedo

—

Surface gravity log(g/g_H)

—

Alternate Names

—

Data Source	Type	Result Value	Result Figure	Notes	Reference

Molecule	Data Source	Type	Result Value	Result Figure	Notes	Reference

No remarks

No link

Star

Name

K2-138

Distance

183.0 (\pm 17.0)

pc 1 publication

The K2-138 System: A Near-Resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists

Spectral type

K1 V

Apparent magnitude V

12.21

Mass

0.93 (\pm 0.06)

M_Sun 1 publication

The K2-138 System: A Near-Resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists

Age

—

Effective temperature

5378.0 (\pm 60.0)

K 1 publication

The K2-138 System: A Near-Resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists

Radius

0.86 (\pm 0.08)

R_Sun 1 publication

The K2-138 System: A Near-Resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists

Metallicity [Fe/H]

0.16 (\pm 0.04)

1 publication

The K2-138 System: A Near-Resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists

Detected Disc

—

Magnetic Field

—

RA₂₀₀₀

23:15:47.8

Dec₂₀₀₀

-10:50:58.9

Alternate Names

EPIC 245950175, 2MASS J23154776-1050590, WISE J231547.76-105059.0

No remarks

No link

Simbad
Most recent references (ADS)

Planet K2-138 g

Planet

Basic informations 28 parameters

Atmospheric parameters : Temperatures 0 temperatures

Atmospheric parameters : Molecules 0 molecules

Remarks No remark

Other web pages No page

Star

Basic informations 13 parameters

Planetary system 6 planets

Remarks No remark

Other web pages No page

More data 2 references

Planet K2-138 g

Planet

Basic informations 28 parameters

Atmospheric parameters : Temperatures 0 temperatures

Atmospheric parameters : Molecules 0 molecules

Remarks No remark

Other web pages No page

Star

Basic informations 13 parameters

Planetary system 6 planets

Remarks No remark

Other web pages No page

More data 2 references

Related publications

Tidal interactions' shape period ratios in planetary systems with three-body resonant chains

Mean motion resonance capture in the context of type I migration

A Six-Planet Resonance Chain in K2-138?

Confirming the 3:2 Resonance Chain of K2-138

Water content trends in K2-138 and other low-mass multiplanetary systems

K2-138 g: Spitzer Spots a Sixth Planet for the Citizen Science System

The orbital evolution of resonant chains of exoplanets incorporating circularisation produced by tidal interaction with the central star with application to the HD 158259 and EPIC 245950175 systems

Transit Duration Variations in Multi-Planet Systems

Exoplanet characterisation in the longest known resonant chain: the K2-138 system seen by HARPS

The K2-138 System: A Near-Resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists