TEPCat: K2-198b


This page summarises the information held within TEPCat for the transiting planetary system K2-198b. Please see here for descriptions of the quantities given below.


Discovery and basic observable quantities:
Quantity Value Unit
Reference of discovery paper 2018AJ....155..136M  
Date of discovery paper 2018 / 2 / 15 y / m / d
Data/telescope used for discovery K2  
Right ascension 13 15 22.54 h m s
Declination −06 27 53.6 d m s
Right ascension (decimal) 198.84392 degrees
Declination (decimal) -6.46489 degrees
V-band apparent magnitude 10.97 mag
K-band apparent magnitude 9.23 mag
Transit duration 0.17
( 4.1 )
Transit depth 0.28 %
Time of mid-transit   2457204.5687 ± 0.0014     HJD or BJD
Orbital period 17.0428683 ± 0.0000053 days
Reference for orbital ephemeris   2019ApJ...880L...5H  


Physical properties from the most recent detailed study:
Quantity Value Unit
Stellar effective temperature 5213 +99 −49 K
Stellar metal abundance ([Fe/H] or [M/H])   dex
Stellar mass 0.799 +0.091 −0.045   Msun
Stellar radius 0.757 +0.035 −0.016 Rsun
Stellar logarithmic surface gravity c.g.s.
Stellar mean density ρsun
g cm-3
Orbital eccentricity  
Orbital semimajor axis     AU
Planetary mass Mjup
Planetary radius 0.374 +0.020 −0.009
( 4.19 +0.22 −0.10 )
Planetary surface gravity m/s2
Planetary mean density ρjup
g cm-3
Planetary equilibrium temperature 716 +19 −9 K
Reference of detailed study 2019ApJ...880L...5H  


K2-198b does not have an entry in the catalogue of orbital obliquity measurements.


K2-198b 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)