Upsilon Andromedae

Upsilon Andromedae was the first star determined to have more than one extrasolar planet. So far, three such objects have been discovered within the system; all three are believed to be gas giants.

The Three Extrasolar Planets of Upsilon Andromedae

• A
  • Distance from UA: 0.06AU
  • Mass: 0.71 M_J
  • Orbital Period: 4.6 days
• B
  • Distance from UA: 0.83AU
  • Mass: 2.11 M_J
  • Orbital Period: 242 days
• C
  • Distance from UA: 2.5AU
  • Mass: 4.61 M_J
  • Orbital Period: 3.5 years