| 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] |
| 1,276.46 ± 0.57[1]d ~3.49626[1] y | |
| Inclination | 23.758 ± 1.316[2] |
| 4.073 ± 3.301[2] | |
| 2,450,059 ± 3.495[2] | |
| 252.991 ± 1.311[2] | |
| Semi-amplitude | 68.14 ± 0.45[1] |
| Star | Upsilon Andromedae A |
| Physical characteristics | |
| ~1.02 RJ | |
| Mass | 10.25+0.7 −3.3[2] MJ |
| Temperature | 218 K (−55 °C; −67 °F) |
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.
- ^ 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. Archived from the original on 2019-12-09. Retrieved 2021-10-28.
- ^ 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. Archived (PDF) from the original on 2011-06-10. Retrieved 2010-05-25.