Kepler-16b
| Kepler-16b | |
 Illustation av Kepler-16 systemet | |
| Upptäckt | |
|---|---|
| Upptäckare | Laurance Doyle |
| Upptäcktsdatum | 7 juli 2011 |
| Upptäcktsmetod | Transitmetoden |
| Moderstjärna | |
| Moderstjärna | Kepler 16 |
| Stjärnbild | Svanen |
| Omloppsbana | |
| Halv storaxel | 0,7048 AU [1] |
| Siderisk omloppstid | 228,776 d [1] |
| Inklination | 90,0322°[1] |
| Fysikaliska data | |
| Medelradie | 0,7538 RJ [1] |
| Massa | 0,333 MJ [1] |
| Rektascension (nordpolen) | 19t 16m 18.17s |
| Deklination (nordpolen) | +51° 45′ 26.78″ |
| Temperatur | ~170-200 K [1] |
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Kepler-16b är en exoplanet som upptäcktes den 7 juli 2011. Planeten är den första himlakroppen man hittat som kretsar runt två stjärnor. Upptäckten gjordes med transitmetoden av Keplerteleskopet och offentliggjordes den 15 september 2011.
Till sin massa är planeten ungefär som Saturnus och består till hälften av gas och till hälften av sten och is.[2]
Varaktigheten av de passager som Kepler-16b gjort framför stjärnorna i systemet har tillåtit mycket hög precision i beräkningar av stjärnornas och planetens massor.[3]
Referenser
- ^ [a b c d e f] ”- NASA:s Keplersida”. Arkiverad från originalet den 1 april 2017. https://web.archive.org/web/20170401080610/https://kepler.nasa.gov/MIssion/discoveries/. Läst 8 april 2012.
- ^ Drake, Nadia. ”On Kepler-16b, shadows come in pairs”. Science News. Society for Science & the Public. Arkiverad från originalet den 28 augusti 2012. https://www.webcitation.org/6AG90FhhX?url=http://www.sciencenews.org/view/generic/id/334409/title/On_Kepler-16b,_shadows_come_in_pairs. Läst 15 november 2015.
- ^ Overbye, Dennis (15 september 2011). ”NASA Detects Planet Dancing With a Pair of Stars”. The New York Times. http://www.nytimes.com/2011/09/16/science/space/16planet.html. Läst 15 november 2015.
- Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, tidigare version.
Media som används på denna webbplats
Författare/Upphovsman: Silver Spoon, Licens: CC BY-SA 3.0
Artistic impression of the Kepler-16-system with Kepler-16A in yellow, Kepler-16B in orange/red and Kepler-16b in purple.
From the original caption: NASA's Kepler mission has discovered a world where two suns set over the horizon instead of just one. The planet, called Kepler-16b, is the most "Tatooine-like" planet yet found in our galaxy and is depicted here in this artist's concept with its two stars. Tatooine is the name of Luke Skywalker's home world in the science fiction movie Star Wars. In this case, the planet is not thought to be habitable. It is a cold world, with a gaseous surface, but like Tatooine, it circles two stars. The largest of the two stars, a K dwarf, is about 69 percent the mass of our sun, and the smallest, a red dwarf, is about 20 percent the sun's mass.
Most of what we know about the size of stars comes from pairs of stars that are oriented toward Earth in such a way that they are seen to eclipse each other. These star pairs are called eclipsing binaries. In addition, virtually all that we know about the size of planets around other stars comes from their transits across their stars. The Kepler-16 system combines the best of both worlds with planetary transits across an eclipsing binary system. This makes Kepler-16b one of the best-measured planets outside our solar system.
Kepler-16 orbits a slowly rotating K-dwarf that is, nevertheless, very active with numerous star spots. Its other parent star is a small red dwarf. The planetary orbital plane is aligned within half a degree of the stellar binary orbital plane. All these features combine to make Kepler-16 of major interest to studies of planet formation as well as astrophysics.