TEPCat: K2-138e


 

This page summarises the information held within TEPCat for the transiting planetary system K2-138e. 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 0.1276
( 3.062 )
day
hour
Transit depth 0.12 %
Time of mid-transit   2457740.64558 ± 0.00083     HJD or BJD
Orbital period 8.26146 ± 0.00022 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 +0.183 −0.0  
Orbital semimajor axis   0.07820 +0.00053 −0.00066  AU
Planetary mass 0.0409 ± 0.0063
( 13.0 ± 2.0 )
Mjup
Mearth
Planetary radius 0.302 +0.012 −0.010
( 3.39 +0.13 −0.11 )
Rjup
Rearth
Planetary surface gravity m/s2
log(cgs)
Planetary mean density 1.35 +0.27 −0.24
( 1.79 +0.36 −0.32 )
ρjup
g cm-3
Planetary equilibrium temperature 861 +16 −13 K
Reference of detailed study arXiv:1909.13527  

 

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

 

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

 


Page generated on 2021/12/02           John Southworth   (Keele University, UK)