Kepler-90
| Kepler-90 | |
 Jämförelse mellan Kepler-90s solsystem med det inre solsystemet (14 december 2017). | |
| Observationsdata | |
|---|---|
| Stjärnbild | Draken[1] |
| Rektascension | 18rt 57m 44,04s[2] |
| Deklination | 49° 18′ 18,6″[2] |
| Astrometri | |
| Avstånd | 2545[3] lå (780±100[2] pc) |
| Detaljer | |
| Massa | 1,2±0,1[2] M☉ |
| Radie | 1,2±0,1[2] R☉ |
| Temperatur | 6080 +260-170[2] K |
| Metallicitet | -0,12±0,18[2] |
| Andra beteckningar | |
| KOI-351[2] | |
Kepler-90 eller KOI-351 är en stjärna i stjärnbilden Draken med ett solsystem med 8 bekräftade planeter.
Stjärnan har en planetkonfiguration liknande solens.[3][4] Närmast Kepler-90 finns sex mindre planeter; Kepler-90b, Kepler-90c, Kepler-90i, Kepler-90d, Kepler-90e och Kepler-90f. Utanför dessa finns två större planeter; Kepler-90g och Kepler-90h.[4] Kepler-90i är den senast upptäckta planeten, och hittades 14 december 2017 med hjälp av ett maskininlärande system från Google som är integrerat i Nasas Keplerteleskop.[3]
Kepler-90 finns mer än 2 500 ljusår från jorden.[3]
Referenser
Noter
- ^ ”Artificial Intelligence, NASA Data Used to Discover Eighth Planet Circling Distant Star” (på engelska). Nasa. https://www.nasa.gov/press-release/artificial-intelligence-nasa-data-used-to-discover-eighth-planet-circling-distant-star. Läst 16 december 2017.
- ^ [a b c d e f g h] ”PLANET HOST OVERVIEW PAGE / Kepler-90” (på engelska). Nasa. https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=Kepler-90. Läst 16 december 2017.
- ^ [a b c d] ”NASA And Google Just Announced They’ve Found Another Solar System Like Ours” (på engelska). Sciencepage. Arkiverad från originalet den 17 december 2017. https://web.archive.org/web/20171217014124/https://thesciencepage.com/nasa-and-google-just-announced-theyve-found-another-solar-system-like-ours/. Läst 16 december 2017.
- ^ [a b] ”Kepler-90 System Planet Sizes” (på engelska). Nasa. https://www.nasa.gov/image-feature/ames/kepler-90-system-planet-sizes. Läst 16 december 2017.
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Media som används på denna webbplats
PIA22193: Kepler-90 System Compared to Our Solar System (Artist's Concept)
https://photojournal.jpl.nasa.gov/catalog/PIA22193
With the discovery of an eighth planet, NASA's Kepler-90 system is the first to tie with our solar system in number of planets. This is an artist's concept compared with our own solar system.
Our solar system now is tied for most number of planets around a single star, with the recent discovery of an eighth planet circling Kepler-90, a Sun-like star 2,545 light years from Earth. The planet was discovered in data from NASA's Kepler Space Telescope. This artist's concept depicts the Kepler-90 system compared with our own solar system.
The newly-discovered Kepler-90i -- a sizzling hot, rocky planet that orbits its star once every 14.4 days -- was found using machine learning from Google. Machine learning is an approach to artificial intelligence in which computers "learn." In this case, computers learned to identify planets by finding in Kepler data instances where the telescope recorded changes in starlight caused by planets beyond our solar system, known as exoplanets.
NASA Ames manages the Kepler and K2 missions for NASA's Science Mission Directorate. JPL managed Kepler mission development. Ball Aerospace & Technologies Corporation operates the flight system with support from the Laboratory for Atmospheric and Space Physics at the University of Colorado in Boulder.
For more information on the Kepler and the K2 mission, visit www.nasa.gov/Kepler.
For more information about exoplanets, visit https://exoplanets.nasa.gov/.December 14, 2017
Kepler-90 Planets Orbit Close to Their Star
https://www.nasa.gov/image-feature/ames/kepler-90-planets-orbit-close-to-their-star
Kepler-90 system planet orbits, compared to planetary orbits in our solar system
Kepler-90 is a Sun-like star, but all of its eight planets are scrunched into the equivalent distance of Earth to the Sun. The inner planets have extremely tight orbits with a “year” on Kepler-90i lasting only 14.4 days. In comparison, Mercury’s orbit is 88 days. Consequently, Kepler-90i has an average surface temperature of 800 degrees Fahrenheit, and is not a likely place for life as we know it. The structure of the Kepler-90’s system hints that the eight planets around Kepler-90 may have formed more spread out, like the planets in our own solar system, and then somehow migrated to the orbits we see them in today.