TEPCat: K2-138g


 

This page summarises the information held within TEPCat for the transiting planetary system K2-138g. Please see here for descriptions of the quantities given below.

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper arXiv:1909.13527  
Date of discovery paper 2018 / 1 / 12 y / m / d
Right ascension 23 15 47.77 h m s
Declination −10 50 58.9 d m s
V-band apparent magnitude 12.21 mag
K-band apparent magnitude 10.31 mag
Transit duration 0.198
( 4.75 )
day
hour
Transit depth 0.12 %
Time of mid-transit   2457773.862 ± 0.025     HJD or BJD
Orbital period 41.968 ± 0.008 days
Reference for orbital ephemeris   arXiv:1909.13527  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 5350 ± 80 K
Stellar metal abundance ([Fe/H] or [M/H])   +0.14 ± 0.10 dex
Stellar mass 0.93 ± 0.02   Msun
Stellar radius 0.86 +0.03 −0.02 Rsun
Stellar logarithmic surface gravity 4.54 +0.02 −0.04 c.g.s.
Stellar mean density 1.46 +0.10 −0.19
( 2.06 +0.14 −0.27 )
ρsun
g cm-3
Orbital eccentricity 0.0 +0.226 −0.0  
Orbital semimajor axis   0.23109 +0.00154 −0.00196  AU
Planetary mass 0.0135 +0.0167 −0.0094
( 4.3 +5.3 −3.0 )
Mjup
Mearth
Planetary radius 0.269 +0.027 −0.022
( 3.02 +0.30 −0.25 )
Rjup
Rearth
Planetary surface gravity m/s2
log(cgs)
Planetary mean density 0.65 +0.81 −0.45
( 0.86 +1.07 −0.60 )
ρjup
g cm-3
Planetary equilibrium temperature 501 +9 −7 K
Reference of detailed study arXiv:1909.13527  

 

K2-138g does not have an entry in the catalogue of orbital obliquity measurements.

 

K2-138g has not been analysed as part of the Homogeneous Studies of Transiting Extrasolar Planets project.

 


Page generated on 2021/01/04           John Southworth   (Keele University, UK)