TEPCat: K2-138b


 

This page summarises the information held within TEPCat for the transiting planetary system K2-138b. 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 0.0721
( 1.730 )
day
hour
Transit depth 0.03 %
Time of mid-transit   2457773.3170 ± 0.0037     HJD or BJD
Orbital period 2.35322 ± 0.00036 days
Reference for orbital ephemeris   2018AJ....155...57C  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 5378 ± 60 K
Stellar metal abundance ([Fe/H] or [M/H])   +0.16 ± 0.04 dex
Stellar mass 0.93 ± 0.06   Msun
Stellar radius 0.86 ± 0.08 Rsun
Stellar logarithmic surface gravity 4.59 ± 0.07 c.g.s.
Stellar mean density ρsun
g cm-3
Orbital eccentricity 0.0 +0.403 −0.0  
Orbital semimajor axis   0.03380 ± 0.00024  AU
Planetary mass Mjup
Mearth
Planetary radius 0.140 +0.025 −0.015
( 1.57 +0.28 −0.17 )
Rjup
Rearth
Planetary surface gravity m/s2
log(cgs)
Planetary mean density ρjup
g cm-3
Planetary equilibrium temperature K
Reference of detailed study 2018AJ....155...57C  

 

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

 

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

 


Page generated on 2019/07/16           John Southworth   (Keele University, UK)