Upsilon Andromedae d
Upsilon Andromedae d (υ Andromedae d, abbreviated Upsilon And d, υ And d), formally named Majriti /mædʒˈraɪti/, is a super-Jupiter exoplanet orbiting within the habitable zone of the Sun-like star Upsilon Andromedae A, approximately 44 light-years (13.5 parsecs, or nearly 416.3 trillion km) away from Earth in the constellation of Andromeda. Its discovery made it the first multiplanetary system to be discovered around a main-sequence star, and the first such system known in a multiple star system. The exoplanet was found by using the radial velocity method, where periodic Doppler shifts of spectral lines of the host star suggest an orbiting object.
| Discovery | |
|---|---|
| Discovered by | Butler, Marcy et al. |
| Discovery site | California and Carnegie Planet Search USA |
| Discovery date | April 15, 1999 |
| Radial velocity | |
| Orbital characteristics | |
| Apastron | ~478 Gm |
| Periastron | ~282 Gm |
| ~380 Gm | |
| Eccentricity | 0.299 ± 0.072 |
| 1,276.46 ± 0.57d ~3.49626 y | |
| Inclination | 23.758 ± 1.316 |
| 4.073 ± 3.301 | |
| 2,450,059 ± 3.495 | |
| 252.991 ± 1.311 | |
| Semi-amplitude | 68.14 ± 0.45 |
| Star | Upsilon Andromedae A |
| Physical characteristics | |
Mean radius | ~1.02 RJ |
| Mass | 10.25+0.7 −3.3 MJ |
| Temperature | 218 K (−55 °C; −67 °F) |
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