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
Right ascension 22 03 10.80 h m s
Declination +18 53 04.0 d m s
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 Rossiter-McLaughlin 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  

 

 

HD 209458 has been examined as part of the Homogeneous Studies of Transiting Extrasolar Planets project. The details from this work have been given below. In most instances they are the same as the physical properties given above, but in some cases the Homogeneous Studies results given below have been superseded by newer analyses. Separate statistical and systematic errorbars are given where relevant.

Measured parameters Value Unit
Orbital velocity amplitude 85.1 ± 1.0 m/s
Stellar effective temperature 6117 ± 50 K
Stellar metal abundance ([Fe/H] or [M/H])   +0.02 ± 0.05 dex
Orbital inclination 86.590 ± 0.046   degrees
Fractional stellar radius (R* / a) 0.11384 ± 0.00041  
Fractional planetary radius (Rpl / a)   0.01389 ± 0.00006   
Light curve analysis reference 2008MNRAS.386.1644S  
 
Derived parameters Value Unit
Stellar mass 1.148 ± 0.033 ± 0.022 Msun
Stellar radius 1.162 ± 0.012 ± 0.008 Rsun
Stellar logarithmic surface gravity 4.368 ± 0.005 ± 0.003 c.g.s.
Stellar mean density 0.733 ± 0.008 ρsun
Orbital semimajor axis   0.04747 ± 0.00046 ± 0.00031  AU
Planetary mass 0.714 ± 0.014 ± 0.009 Mjup
Planetary radius 1.380 ± 0.015 ± 0.009 Rjup
Planetary surface gravity 9.30 ± 0.08 m/s2
Planetary mean density 0.254 ± 0.004 ± 0.002 ρjup
Planetary equilibrium temperature 1459 ± 12 K
Safronov number 0.0427 ± 0.0005 ± 0.0003  
Main analysis reference 2010MNRAS.408.1689S  

 


Page generated on 2017/12/05           John Southworth   (Keele University, UK)