From the Extrasolar Planets Encyclopaedia : http://exoplanet.eu 
Star : tau Boo
THE STAR
- Basic data :   
- More data : 
  - Basic data (from Simbad)
- Most recent ref (from ADS)
 
Name tau Boo
Distance15 pc 
Spectral TypeF7 V   
Apparent Magnitude V4.5   
Mass1.3 Msun ref.
Age2.52 Gyr ref.
Effective Temperature6309 K ref.
Radius1.331 (± 0.027) Rsun ref.
Metallicity [Fe/H]0.28   ref.
Right Asc. Coord.13 47 17  
Decl. Coord.+17 27 22  

PLANET
- Basic data : 
 
Nametau Boo b
Discovered in1996   
Mass3.9 MJ ref.
Semi major axis0.046 AU ref.
Orbital period3.3135 (± 0.0014) days ref.
Eccentricity0.018 (± 0.016)   ref.
ω254 deg. ref.
Tmax VR1.27 (± 0.03) JD 2.450.000 ref.
Update10/04/09   

- Molecules detected : 
 
Nametau Boo b
MoleculesNone

- tau Boo Remarks : 
 
  1. 10 Apr. 09: RV measurements with amateur spectrograph (Christian Buil).
  2. 10 sep. 03: New upper limit of 0.39 for the reflection albedo (Leigh et al 2003)
  3. 20 apr. 03: Planet in wide (a ~ 240 AU) binary system (Eggenberger et al 2003)
  4. 22 spt. 2000: the planet not so bright as previously announced (Cameron et al).
  5. Exhibits coherent variations in residual velocities consistent with additional companion.
    24 Jul. 00: the source of RV variation remains speculative, depending on completion of one full orbit (Fischer et al 2000).
  6. `Probable detection' of the reflected star-light by the planet (Cameron et. al, 1999). The albedo is claimed to be detected only from 456 to 524 nm.
  7. The star has a companion ( GJ 527B) about 240 AU away.
- tau Boo Other web pages : 
 
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