TEPCat: KELT-21


 

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

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper arXiv:1712.03241  
Date of discovery paper 2017 / 12 / 12 y / m / d
Right ascension 20 19 12.00 h m s
Declination +32 34 51.8 d m s
V-band apparent magnitude 10.48 mag
K-band apparent magnitude 10.09 mag
Transit duration 0.17106
( 4.1054 )
day
hour
Transit depth 1.1 %
Time of mid-transit   2457382.64073 ± 0.00041     HJD or BJD
Orbital period 3.6127628 ± 0.0000028 days
Reference for orbital ephemeris   arXiv:1712.03241  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 7598 +81 −84 K
Stellar metal abundance ([Fe/H] or [M/H])   −0.405 +0.032 −0.033 dex
Stellar mass 1.458 +0.029 −0.028   Msun
Stellar radius 1.638 ± 0.034 Rsun
Stellar logarithmic surface gravity 4.173 +0.015 −0.014 c.g.s.
Stellar mean density 0.332 +0.018 −0.017
( 0.468 +0.025 −0.024 )
ρsun
g cm-3
Orbital eccentricity 0.0  
Orbital semimajor axis   0.05224 +0.00035 −0.00034  AU
Planetary mass 0.0 +3.9 −0.0
( 0 +1239 −0 )
Mjup
Mearth
Planetary radius 1.586 +0.039 −0.040
( 17.78 + 0.44 − 0.45 )
Rjup
Rearth
Planetary surface gravity 0.0 +38.9 −0.0
**0000000000000000000000000000000000000000000000000 +**0000000000000000000000000000000000000000000000000 −**0000000000000000000000000000000000000000000000000
m/s2
log(cgs)
Planetary mean density 0.0 +0.93 −0.0
( 0.0 +1.2 −0.0 )
ρjup
g cm-3
Planetary equilibrium temperature 2051 +29 −30 K
Reference of detailed study arXiv:1712.03241  

 

Entries in the catalogue of orbital obliquity measurements:
 
Reference λ (degrees)
Johnson et al. (2017)   −5.6   + 1.7   - 1.9  

 

 

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

 


Page generated on 2018/10/12           John Southworth   (Keele University, UK)