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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

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