TEPCat: HAT-P-21


 

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

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper 2011ApJ...742..116B  
Date of discovery paper 2010 / 8 / 23 y / m / d
Right ascension 11 25 05.88 h m s
Declination +41 01 40.6 d m s
V-band apparent magnitude 11.69 mag
K-band apparent magnitude 10.11 mag
Transit duration 0.1530
( 3.672 )
day
hour
Transit depth 1.1 %
Time of mid-transit   2454996.41312 ± 0.00069     HJD or BJD
Orbital period 4.124481 ± 0.000007 days
Reference for orbital ephemeris   2011ApJ...742..116B  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 5588 ± 80 K
Stellar metal abundance ([Fe/H] or [M/H])   +0.01 ± 0.08 dex
Stellar mass 0.947 ± 0.042   Msun
Stellar radius 1.105 ± 0.083 Rsun
Stellar logarithmic surface gravity 4.33 ± 0.06 c.g.s.
Stellar mean density ρsun
g cm-3
Orbital eccentricity 0.228 ± 0.016  
Orbital semimajor axis   0.0494 ± 0.0007  AU
Planetary mass 4.063 ± 0.161
( 1291 ± 51 )
Mjup
Mearth
Planetary radius 1.024 ± 0.092
( 11.5 ± 1.0 )
Rjup
Rearth
Planetary surface gravity 95 ± 18
3.98 ± 0.08
m/s2
log(cgs)
Planetary mean density 3.77 +1.28 −0.80
( 5.0 +1.7 −1.1 )
ρjup
g cm-3
Planetary equilibrium temperature 1283 ± 50 K
Reference of detailed study 2011ApJ...742..116B  

 

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

 

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

 


Page generated on 2017/12/13           John Southworth   (Keele University, UK)