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Kepler-90i

Coordinates: Sky map 18h 57m 44.04s, +49° 18′ 18.6″
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Template:Planetbox begin Template:Planetbox image Template:Planetbox star Template:Planetbox character Template:Planetbox orbit Template:Planetbox discovery Template:Planetbox catalog Template:Planetbox reference Template:Planetbox end Kepler-90i (also known by its Kepler Object of Interest designation KOI-351 l[1]) is a super-Earth exoplanet with a radius 1.34[1] that of Earth, orbiting the early G-type main sequence star Kepler-90 every 14.45 days, discovered by NASA's Kepler spacecraft.[2] It is located about 2,545 light-years (780 parsecs, or nearly 2.4078×1016 km) from Earth in the constellation Draco. The exoplanet is the eighth in the star's multiplanetary system. As of December 2017, Kepler-90 is the star hosting the most exoplanets found. Kepler-90i was found with the transit method, in which the dimming effect that a planet causes as it crosses in front of its star is measured, and by a newly utilized computer tool, deep learning, a class of machine learning algorithms.[2][3][4]

Characteristics

Mass, radius and temperature

Kepler-90i is a super-Earth exoplanet with a radius of 1.32 R🜨[1], indicating that it is small enough to be rocky. With an Earth-like composition, Kepler-90i would have a mass of about 2.5 ME. It has an equilibrium temperature of 709 K (436 °C; 817 °F), similar to the average temperature of Venus.

Host star

The planet orbits a (G-type) star named Kepler-90. The star has a mass of 1.2 M☉ and a radius 1.2 R☉. It has a surface temperatures of 6080 K and has an estimated age of around 2 billion years, with considerable uncertainty. In comparison, the Sun is about 4.6 billion years old[5] and has a surface temperature of 5778 K.[6]

The star's apparent magnitude, or how bright it appears from Earth's perspective, is 14. It is too dim to be seen with the naked eye.

Orbital characteristics

Kepler-90i orbits its host star about every 14.45 days with a semi-major axis of 0.1234 AU.

Discovery

In 2009, NASA's Kepler spacecraft was completing observing stars on its photometer, the instrument it uses to detect transit events, in which a planet crosses in front of and dims its host star for a brief and roughly regular period of time. In this last test, Kepler observed 50000 stars in the Kepler Input Catalog, including Kepler-90; the preliminary light curves were sent to the Kepler science team for analysis, who chose obvious planetary companions from the bunch for follow-up at observatories. Discovery of the exoplanet was aided by a newly utilized computer tool, deep learning, a class of machine learning algorithms.[2][3]

Kepler-90 ExoPlanetary System Compared to our Solar System

See also

References

  1. ^ a b c Cite error: The named reference NASAExoplanet was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Harvard-20171216 was invoked but never defined (see the help page).
  3. ^ a b Chou, Felecia; Hawkes, Alison; Northon, Karen (14 December 2017). "Release 17-098 - Artificial Intelligence, NASA Data Used to Discover Eighth Planet Circling Distant Star". NASA. Retrieved 14 December 2017.
  4. ^ Chou, Felicia; Hawkes, Alison; Landau, Elizabeth (14 December 2017). "Artificial Intelligence, NASA Data Used to Discover Eighth Planet Circling Distant Star". NASA. Retrieved 15 December 2017.
  5. ^ Cain, Fraser (16 September 2008). "How Old is the Sun?". Universe Today. Retrieved 14 December 2017.
  6. ^ Cain, Fraser (15 September 2008). "Temperature of the Sun". Universe Today. Retrieved 14 December 2017.


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