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
Data/telescope used for discovery HAT  
Right ascension 11 25 05.88 h m s
Declination +41 01 40.6 d m s
Right ascension (decimal) 171.27450 degrees
Declination (decimal) 41.02794 degrees
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   2454996.41243 ± 0.00060     HJD or BJD
Orbital period 4.12449009 ± 0.00000090 days
Reference for orbital ephemeris   arXiv:2205.10549  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 5695 ± 45 K
Stellar metal abundance ([Fe/H] or [M/H])   +0.04 ± 0.09 dex
Stellar mass 0.998 ± 0.040   Msun
Stellar radius 1.248 ± 0.050 Rsun
Stellar logarithmic surface gravity 4.245 ± 0.033 c.g.s.
Stellar mean density 0.513 ± 0.058
( 0.724 ± 0.082 )
ρsun
g cm-3
Orbital eccentricity 0.217 ± 0.010  
Orbital semimajor axis   0.05037 ± 0.00067  AU
Planetary mass 4.23 ± 0.16
( 1344 ± 50 )
Mjup
Mearth
Planetary radius 1.130 ± 0.057
( 12.67 ± 0.64 )
Rjup
Rearth
Planetary surface gravity 82.1 ± 8.1
3.91 ± 0.04
m/s2
log(cgs)
Planetary mean density 2.74 ± 0.40
( 3.63 ± 0.53 )
ρjup
g cm-3
Planetary equilibrium temperature 1367 ± 27 K
Reference of detailed study arXiv:2205.10549  

 

Entries in the catalogue of orbital obliquity measurements:
 
Reference λ (degrees)
Mancini et al. (2022)   −0.7   ±   12.5  

 

 

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

 


Page generated on 2022/12/01           John Southworth   (Keele University, UK)