TEPCat: HD 209458

 

This page summarises the information held within TEPCat for the transiting planetary system HD 209458. Please see here for descriptions of the quantities given below.

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper 2000ApJ...529L..41H  
Date of discovery paper 1999 / 11 / 18 y / m / d
Data/telescope used for discovery other  
Right ascension 22 03 10.80 h m s
Declination +18 53 04.0 d m s
Right ascension (decimal) 330.79500 degrees
Declination (decimal) 18.88444 degrees
V-band apparent magnitude 7.65 mag
K-band apparent magnitude 6.31 mag
Transit duration 0.127
( 3.05 ) 		day
hour
Transit depth 2.1 %
Time of mid-transit   2455216.405640 ± 0.000094     HJD or BJD
Orbital period 3.52474859 ± 0.00000038 days
Reference for orbital ephemeris   2014ApJ...790...53Z  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 6117 ± 50 K
Stellar metal abundance ([Fe/H] or [M/H])   +0.02 ± 0.05 dex
Stellar mass 1.148 ± 0.040   Msun
Stellar radius 1.162 ± 0.014 Rsun
Stellar logarithmic surface gravity 4.368 ± 0.006 c.g.s.
Stellar mean density 0.733 ± 0.008
( 1.034 ± 0.011 ) 		ρsun
g cm-3
Orbital eccentricity 0.0  
Orbital semimajor axis   0.04747 ± 0.00055  AU
Planetary mass 0.714 ± 0.017
( 226.97 ± 5.40 ) 		Mjup
Mearth
Planetary radius 1.380 ± 0.017
( 15.47 ± 0.19 ) 		Rjup
Rearth
Planetary surface gravity 9.30 ± 0.08
2.968 ± 0.004		 m/s2
log(cgs)
Planetary mean density 0.272 ± 0.004
( 0.3608 ± 0.0053 ) 		ρjup
g cm-3
Planetary equilibrium temperature 1459 ± 12 K
Reference of detailed study 2010MNRAS.408.1689S  

 

Entries in the catalogue of orbital obliquity measurements:
 
Reference λ (degrees)
Queloz et al. (2000)   3.9   + 18   - 21  
Winn et al. (2005)   −4.4   ±   1.4  
Albrecht et al. (2012)   −5   ±   7  
Santos et al. (2020)   0.6   ±   0.4  
Casasayas-Barris et al. (2021)   1.58   ±   0.08  

 

 

Page generated on 2025/01/01           John Southworth   (Keele University, UK)