From the Extrasolar Planets Encyclopaedia : http://exoplanet.eu 
Planet : WASP-21 b
THE PLANET
Basic data : 
 
Name WASP-21 b
Discovered in2010   
M.sin i0.3 (± 0.01) MJ ref.
Semi major axis0.052 (−0.00044+0.00041AU ref.
Orbital period4.322482 (−2.4e-05+1.9e-05days ref.
Eccentricity  
Radius1.07 (± 0.05) RJ ref.
Ttransit2454743.04185 (−0.0022+0.0019)  ref.
Inclination88.75 (−0.7+0.84deg. ref.
Update15/04/10   
No molecule detected
 
 3 related publications :  (sort by author)  (sort by date)
THE STAR
Basic data :   
More data : 
  - Basic data (from Simbad)
- Most recent ref (from ADS)
 
Remarks : 
 Alias GSC 1715-679
 
Name WASP-21
Distance230 (± 30) pc ref.
Spectral TypeG3V   
Apparent Magnitude V11.6   
Mass1.01 (−0.025+0.024Msun ref.
Effective Temperature5800 (± 100) K ref.
Radius1.06 (± 0.04) Rsun ref.
Metallicity [Fe/H]-0.4 (± 0.1)   ref.
Right Asc. Coord.23 09 58   
Decl. Coord.+18 23 46