TEPCat: K2-138d


 

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

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper 2018AJ....155...57C  
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 0.124
( 2.98 )
day
hour
Transit depth 0.08 %
Time of mid-transit   2457743.15989 ± 0.00092     HJD or BJD
Orbital period 5.40479 ± 0.00021 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 +0.144 −0.0  
Orbital semimajor axis   0.05893 +0.00040 −0.00050  AU
Planetary mass 0.0249 +0.0044 −0.0041
( 7.9 +1.4 −1.3 )
Mjup
Mearth
Planetary radius 0.213 +0.009 −0.007
( 2.388 +0.101 −0.078 )
Rjup
Rearth
Planetary surface gravity m/s2
log(cgs)
Planetary mean density 2.37 +0.52 −0.45
( 3.14 +0.69 −0.60 )
ρjup
g cm-3
Planetary equilibrium temperature 992 +18 −15 K
Reference of detailed study arXiv:1909.13527  

 

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

 

K2-138d 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)