Back 51 الفرس الأعظم b Arabic 51 Pegasi b AST Dimidium Breton 51 Pegasi b BS 51 del Pegàs b Catalan 51 Pegasi b Czech 51 Pegasi b Welsh Dimidium German 51 Πηγάσου b Greek 51 Pegasi b Esperanto
 An artist's impression of 51 Pegasi b (center) and its star (right). | |
| Discovery | |
|---|---|
| Discovered by | Michel Mayor and Didier Queloz |
| Discovery site | OHP, France |
| Discovery date | 6 October 1995 |
| Radial velocity (ELODIE) | |
| Designations | |
| Dimidium | |
| Orbital characteristics | |
| Aphelion | 0.0534 AU (7,990,000 km) |
| Perihelion | 0.0520 AU (7,780,000 km) |
| 0.0527 ± 0.0030 AU (7,880,000 ± 450,000 km) | |
| Eccentricity | 0.013 ± 0.012 |
| 4.230785 ± 0.000036 d 101.5388 h | |
Average orbital speed | 136 km/s |
| Star | 51 Pegasi |
| Physical characteristics | |
| 1.2±0.1 RJ[1] | |
| Mass | 0.46±0.02 MJ[2] |
| Temperature | 1,250 K[2] |
51 Pegasi b, officially named Dimidium /dɪˈmɪdiəm/, is an extrasolar planet approximately 50 light-years (15 parsecs) away in the constellation of Pegasus. It was the first exoplanet to be discovered orbiting a main-sequence star,[3] the Sun-like 51 Pegasi, and marked a breakthrough in astronomical research. It is the prototype for a class of planets called hot Jupiters.[4]
In 2017, traces of water were discovered in the planet's atmosphere.[5] In 2019, the Nobel Prize in Physics was awarded in part for the discovery of 51 Pegasi b.[6]
- ^ Cite error: The named reference
Spring2023was invoked but never defined (see the help page). - ^ a b Brogi, M.; Snellen, I. A. G.; de Kok, R. J.; Albrecht, S.; Birkby, J. L.; de Mooij, E. J. W. (2013-04-01). "Detection of Molecular Absorption in the Dayside of Exoplanet 51 Pegasi b?". The Astrophysical Journal. 767: 27. arXiv:1302.6242. Bibcode:2013ApJ...767...27B. doi:10.1088/0004-637X/767/1/27. ISSN 0004-637X.
- ^ How the Universe Works 3. Vol. Jupiter: Destroyer or Savior?. Discovery Channel. 2014.
- ^ Wenz, John (10 October 2019). "Lessons from scorching hot weirdo-planets". Knowable Magazine. Annual Reviews. doi:10.1146/knowable-101019-2. Retrieved 4 April 2022.
- ^ "Water detected in the atmosphere of hot Jupiter exoplanet 51 Pegasi b". phys.org. February 1, 2017.
- ^ Cite error: The named reference
nobelwas invoked but never defined (see the help page).