 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[1] |
| 241.26 ± 0.64[1] d ~0.66228[1] y | |
| Inclination | 7.868 ± 1.003[2] |
| 236.853 ± 7.528[2] | |
| 2,499,922.53 ± 1.17[2] | |
| 247.66 ± 1.76[2] | |
| Semi-amplitude | 56.26 ± 0.52[1] |
| Star | Upsilon Andromedae A |
| Physical characteristics | |
| Mass | 13.98+2.3 −5.3[2] MJ |
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.
- ^ a b c d Ligi, R.; et al. (2012). "A new interferometric study of four exoplanet host stars : θ Cygni, 14 Andromedae, υ Andromedae and 42 Draconis". Astronomy & Astrophysics. 545: A5. arXiv:1208.3895. Bibcode:2012A&A...545A...5L. doi:10.1051/0004-6361/201219467. S2CID 10934982.
- ^ a b c d e McArthur, Barbara E.; et al. (2010). "New Observational Constraints on the υ Andromedae System with Data from the Hubble Space Telescope and Hobby Eberly Telescope" (PDF). The Astrophysical Journal. 715 (2): 1203. Bibcode:2010ApJ...715.1203M. doi:10.1088/0004-637X/715/2/1203. S2CID 120127162.