TEPCat: WASP-21


 

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

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper 2010A+A...519A..98B  
Date of discovery paper 2010 / 6 / 14 y / m / d
Right ascension 23 09 58.23 h m s
Declination +18 23 46.0 d m s
V-band apparent magnitude 11.59 mag
K-band apparent magnitude 9.98 mag
Transit duration 0.1430
( 3.432 )
day
hour
Transit depth 1.4 %
Time of mid-transit   2454743.04217 ± 0.00065     HJD or BJD
Orbital period 4.3225126 ± 0.0000022 days
Reference for orbital ephemeris   2015MNRAS.451.4060S  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 5924 ± 55 K
Stellar metal abundance ([Fe/H] or [M/H])   −0.22 ± 0.04 dex
Stellar mass 0.890 ± 0.079   Msun
Stellar radius 1.136 ± 0.051 Rsun
Stellar logarithmic surface gravity 4.277 ± 0.026 c.g.s.
Stellar mean density 0.607 ± 0.048
( 0.856 ± 0.068 )
ρsun
g cm-3
Orbital eccentricity 0.0  
Orbital semimajor axis   0.0499 ± 0.0015  AU
Planetary mass 0.276 ± 0.019
( 87.7 ± 6.0 )
Mjup
Mearth
Planetary radius 1.162 ± 0.054
( 13.02 ± 0.61 )
Rjup
Rearth
Planetary surface gravity 5.07 ± 0.35
2.71 ± 0.03
m/s2
log(cgs)
Planetary mean density 0.165 ± 0.018
( 0.219 ± 0.024 )
ρjup
g cm-3
Planetary equilibrium temperature 1333 ± 28 K
Reference of detailed study 2013A+A...557A..30C  

 

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

 

WASP-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)