Upsilon Andromedae c
Upsilon Andromedae c (υ Andromedae c, abbreviated Upsilon And c, υ And c), formally named Samh /ˈsɑːm/ (a homophone with the star Salm), is an extrasolar planet orbiting the Sun-like star Upsilon Andromedae A every 241.3 days at an average distance of 0.83 AU (124 million km; 77 million mi). Its discovery in April 1999 by Geoffrey Marcy and R. Paul Butler made this the first multiple-planet system to be discovered around a main-sequence star, and the first multiple-planet system known in a multiple star system. Upsilon Andromedae c is the second-known planet in order of distance from its star.
An artist's impression of Upsilon Andromedae c. | |
| Discovery | |
|---|---|
| Discovered by | Marcy et al. |
| Discovery site | California and Carnegie Planet Search USA |
| Discovery date | April 15, 1999 |
| Radial velocity | |
| Orbital characteristics | |
| Apastron | ~9.11 Gm |
| Periastron | ~91.6 Gm |
| ~124.1 Gm | |
| Eccentricity | 0.260 ± 0.079 |
| 241.26 ± 0.64 d ~0.66228 y | |
| Inclination | 7.868 ± 1.003 |
| 236.853 ± 7.528 | |
| 2,499,922.53 ± 1.17 | |
| 247.66 ± 1.76 | |
| Semi-amplitude | 56.26 ± 0.52 |
| Star | Upsilon Andromedae A |
| Physical characteristics | |
| Mass | 13.98+2.3 −5.3 MJ |
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