TEPCat: K2-238


 

This page summarises the information held within TEPCat for the transiting planetary system K2-238. Please see here for descriptions of the quantities given below.

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper 2018MNRAS.478.5356S  
Date of discovery paper 2018 / 1 / 25 y / m / d
Data/telescope used for discovery K2  
Right ascension 23 10 49.04 h m s
Declination −07 51 27.0 d m s
Right ascension (decimal) 347.70433 degrees
Declination (decimal) -7.85750 degrees
V-band apparent magnitude 13.75 mag
K-band apparent magnitude 12.03 mag
Transit duration 0.16
( 3.8 )
day
hour
Transit depth 0.7 %
Time of mid-transit   2457740.5036 ± 0.0004     HJD or BJD
Orbital period 3.20466 ± 0.00003 days
Reference for orbital ephemeris   2018MNRAS.478.5356S  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 5630 ± 78 K
Stellar metal abundance ([Fe/H] or [M/H])   +0.34 ± 0.04 dex
Stellar mass 1.19 ± 0.08   Msun
Stellar radius 1.59 ± 0.16 Rsun
Stellar logarithmic surface gravity 4.11 ± 0.07 c.g.s.
Stellar mean density 0.0550 +0.0003 −0.0002
( 0.07761 +0.00042 −0.00028 )
ρsun
g cm-3
Orbital eccentricity 0.0  
Orbital semimajor axis   0.046 +0.007 −0.006  AU
Planetary mass 0.86 +0.13 −0.12
( 273 +41 −38 )
Mjup
Mearth
Planetary radius 1.30 +0.15 −0.14
( 14.6 + 1.7 − 1.6 )
Rjup
Rearth
Planetary surface gravity m/s2
log(cgs)
Planetary mean density 0.42 +0.19 −0.12
( 0.56 +0.25 −0.16 )
ρjup
g cm-3
Planetary equilibrium temperature 1587 +75 −76 K
Reference of detailed study 2018MNRAS.478.5356S  

 

K2-238 does not have an entry in the catalogue of orbital obliquity measurements.

 

K2-238 has not been analysed as part of the Homogeneous Studies of Transiting Extrasolar Planets project.

 


Page generated on 2022/12/07           John Southworth   (Keele University, UK)