From the Extrasolar Planets Encyclopaedia : http://exoplanet.eu 
Star : 55 Cnc
THE STAR
- Basic data :   
- More data : 
  - Basic data (from Simbad)
- Most recent ref (from ADS)
 
Name 55 Cnc
Distance13.02 (± 0.4) pc ref.
Spectral TypeG8 V   
Apparent Magnitude V5.95   
Mass1.03 Msun 
Age5.5 Gyr ref.
Effective Temperature5243 (± 93) K ref.
Radius1.15 (± 0.035) Rsun ref.
Metallicity [Fe/H]0.29   
Right Asc. Coord.08 52 37  
Decl. Coord.+28 20 02  

5 PLANETS
- Basic data : 
 
Name55 Cnc b55 Cnc c55 Cnc d55 Cnc e55 Cnc f
Discovered in1996   2002   2002   2004   2007   
Mass0.824 (± 0.007) MJ ref.0.169 (± 0.008) MJ ref.3.835 (± 0.08) MJ ref.0.024 (± 0.0036) MJ ref.0.144 (± 0.04) MJ 
Semi major axis0.115 (± 0.0001) AU ref.0.24 (± 4.5e-05) AU ref.5.77 (± 0.11) AU ref.0.038 (± 1e-06) AU ref.0.781 (± 0.007) AU 
Orbital period14.65162 (± 0.0007) days ref.44.3446 (± 0.007) days ref.5218 (± 230) days ref.2.81705 (± 0.0001) days ref.260 (± 1.1) days 
Eccentricity0.014 (± 0.008)   ref.0.086 (± 0.052)   ref.0.025 (± 0.03)   ref.0.07 (± 0.06)   ref.0.2 (± 0.2)   
ω131.94 deg. 244.39 (± 11) deg. 181.3 (± 32) deg. ref.248.9 (± 38) deg. ref.181.1 (± 60) deg. 
Tperi2450002.94749 (± 1.2)   ref.2449989.3385 (± 3.3)   ref.2452500.6 (± 230)   ref.2449999.83643 (± 0.0001)   ref.2450080.9108 (± 1.1)   
Update07/10/09   07/10/09   07/10/09   07/10/09   07/10/09   

- Molecules detected : 
 
Name55 Cnc b55 Cnc c55 Cnc d55 Cnc e55 Cnc f
MoleculesNoneNoneNoneNoneNone

- 55 Cnc Remarks : 
 
  1. 24 mar. 05: Planet e challanged; Neptune-sized planet at ~ 0.8 AU? (Wisdom, 2005)
  2. 20 apr. 03: Planet in wide (a ~ 1065 AU) binary system (Eggenberger et al 2003)
  3. 12 Feb. 03 55 Cnc is one of the 5 targets of the 14 Feb. 03 "Cosmic Call" initiative
  4. 13 Jun. 02 Periodicity at 44 d. could be due to stellar rotation, but the planet interpretation is more likely (Marcy et al 2002)
  5. 4 Dec. 01:From astrometry with HST (McGrath et al 2002), M < 30 MJ
  6. 22 Nov. 00: From astrometry (Han et al. 2000) claim a preliminary mass of 126 MJ and inclination of 179.6o
  7. 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).
  8. Possible second companion; see Butler et al. 1996, Jayawardhana et al. 2000.
  9. The star is surrounded by a dust disk extending at least a 40 AU, with an inclination of ~ 25o. If the planets are in the same plane than the disc, this gives to the first planet a mass of 1.9+1.1 -0.4 MJ (Trilling & Brown 1998, Trilling et al 2000). But disc not confirmed by Schneider et al (2000b)
    There may by a hole with a radius of ~ 10 AU in the disk (Jayawardhana et al 2000)
  10. The star has a companion (rho Cnc B) about 1150 AU away

  1. 24 mar. 05: Planet e challanged; Neptune-sized planet at ~ 0.8 AU? (Wisdom, 2005)
  2. 20 apr. 03: Planet in wide (a ~ 1065 AU) binary system (Eggenberger et al 2003)
  3. 13 Jun. 02 Periodicity at 44 d. could be due to stellar rotation, but the planet interpretation is more likely (Marcy et al 2002)
  4. 4 Dec. 01:From astrometry with HST (McGrath et al 2002), M < 30 MJ
  5. 22 Nov. 00: From astrometry (Han et al. 2000) claim a preliminary mass of 126 MJ and inclination of 179.6o
  6. 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).
  7. Possible second companion; see Butler et al. 1996, Jayawardhana et al. 2000.
- 55 Cnc Other web pages : 
 
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