TEPCat: Kepler-21


 

This page summarises the information held within TEPCat for the transiting planetary system Kepler-21. Please see here for descriptions of the quantities given below.

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper 2012ApJ...746..123H  
Date of discovery paper 2011 / 12 / 12 y / m / d
Right ascension 19 09 26.84 h m s
Declination +38 42 50.5 d m s
V-band apparent magnitude 8.25 mag
K-band apparent magnitude 6.95 mag
Transit duration 0.1496
( 3.590 )
day
hour
Transit depth 0.007 %
Time of mid-transit   2455093.83716 ± 0.00084     HJD or BJD
Orbital period 2.7858212 ± 0.0000032 days
Reference for orbital ephemeris   2016AJ....152..204L  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 6305 ± 50 K
Stellar metal abundance ([Fe/H] or [M/H])   −0.03 ± 0.10 dex
Stellar mass 1.408 +0.021 −0.030   Msun
Stellar radius 1.902 +0.018 −0.012 Rsun
Stellar logarithmic surface gravity 4.026 ± 0.004 c.g.s.
Stellar mean density 0.203 +0.003 −0.004
( 0.2864 +0.0042 −0.0056 )
ρsun
g cm-3
Orbital eccentricity 0.02 ± 0.1  
Orbital semimajor axis   0.04285 +0.00075 −0.00068  AU
Planetary mass 0.0160 ± 0.0054
( 5.1 ± 1.7 )
Mjup
Mearth
Planetary radius 0.1462 +0.0017 −0.0013
( 1.639 +0.019 −0.015 )
Rjup
Rearth
Planetary surface gravity m/s2
log(cgs)
Planetary mean density 4.8 ± 1.6
( 6.4 ± 2.1 )
ρjup
g cm-3
Planetary equilibrium temperature 2025 ± 20 K
Reference of detailed study 2016AJ....152..204L  

 

Kepler-21 does not have an entry in the catalogue of Rossiter-McLaughlin measurements.

 

Kepler-21 has not been analysed as part of the Homogeneous Studies of Transiting Extrasolar Planets project.

 


Page generated on 2017/12/15           John Southworth   (Keele University, UK)