# Kepler-90i

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Super-Earth orbiting Kepler-90

Kepler-90i Illustration of the Kepler-90 system compared to the inner solar system. Kepler-90h is the outermost planet of the Kepler-90 system. Discovery Discovered by Kepler spacecraft[1] Discovery date 2017 Shallue et al.[2][1] Detection method Transit[2] and deep learning, a class of machine learning algorithms.[1] Orbital characteristics Semi-major axis 0.107+0.025 −0.040[1] AU Orbital period (sidereal) 14.44912±0.00020[2] d Inclination 89.20 +0.59 −1.30[2] Star Kepler-90 Physical characteristics Mean radius 1.32±0.21[2] R🜨 Temperature 709 K (436 °C; 817 °F)[2]

**Kepler-90i** (also known by its Kepler Object of Interest designation KOI-351.08)[2] is a [super-Earth](/source/Super-Earth) [exoplanet](/source/Exoplanet) with a radius 1.32[2] times that of Earth, orbiting the early [G-type main sequence star](/source/G-type_main_sequence_star) [Kepler-90](/source/Kepler-90) every 14.45 days, discovered by [NASA](/source/NASA)'s [Kepler spacecraft](/source/Kepler_(spacecraft)).[1][3] It is located about 2,840 [light-years](/source/Light-year) (870 [parsecs](/source/Parsec), or nearly 2.4078×1016 [km](/source/Km)) from Earth in the constellation [Draco](/source/Draco_(constellation)). 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](/source/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](/source/Deep_learning), a class of [machine learning algorithms](/source/Machine_learning_algorithms).[1][4][5]

## Characteristics

### Mass, radius and temperature

Kepler-90i is a [super-Earth](/source/Super-Earth) [exoplanet](/source/Exoplanet) with a radius of 1.32 [R🜨](/source/Earth_radius),[2] indicating that it is small enough to be [rocky](/source/Terrestrial_planet). With an Earth-like composition, Kepler-90i would have a mass of about 2.3 [M🜨](/source/Earth_mass), since its volume is 1.32 3 ≈ 2.3 {\displaystyle 1.32^{3}\approx 2.3} times that of Earth's. It has an equilibrium temperature of 709 K (436 °C; 817 °F), similar to the average temperature of [Venus](/source/Venus).

### Host star

Main article: [Kepler-90](/source/Kepler-90)

The planet orbits [Kepler-90](/source/Kepler-90), a [G-type](/source/Stellar_classification#Class_G) [main sequence](/source/Main_sequence) [star](/source/Star). The star has a mass of 1.2 M☉ and a radius 1.2 *R*☉. It has a surface temperatures of 6080 [K](/source/Kelvin) and has an estimated age of around 2 billion years, with considerable uncertainty. In comparison, the Sun is about 4.6 billion years old[6] and has a surface temperature of 5778 K.[7]

The star's [apparent magnitude](/source/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 0.107 [AU](/source/Astronomical_unit).

Due to its very close distance to its host star, it is likely to be [tidally locked](/source/Tidal_locking), meaning that one side permanently faces the star in eternal daylight and the other side permanently faces away from the star in eternal darkness.

## Discovery

In 2009, [NASA](/source/NASA)'s [*Kepler* spacecraft](/source/Kepler_(spacecraft)) was observing stars on its [photometer](/source/Photometer), the instrument it uses to detect [transit](/source/Transit_method) events, in which a planet crosses in front of and dims its host star for a brief and roughly regular period of time. In its last test, *Kepler* observed 50000 stars in the [Kepler Input Catalog](/source/Kepler_Input_Catalog), including [Kepler-90](/source/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](/source/Deep_learning), a class of [machine learning algorithms](/source/Machine_learning_algorithms).[1][4]

Artist's impression of the planets of the Kepler-90 exoplanetary system compared to the eight planets of the Solar System.

## See also

- [Kepler-80g](/source/Kepler-80)

## References

1. ^ [***a***](#cite_ref-Harvard-20171216_1-0) [***b***](#cite_ref-Harvard-20171216_1-1) [***c***](#cite_ref-Harvard-20171216_1-2) [***d***](#cite_ref-Harvard-20171216_1-3) [***e***](#cite_ref-Harvard-20171216_1-4) [***f***](#cite_ref-Harvard-20171216_1-5) [***g***](#cite_ref-Harvard-20171216_1-6) Shallue, Christopher J.; Vanderburg, Andrew (16 December 2017). ["Identifying Exoplanets With Deep Learning: A Five Planet Resonant Chain Around Kepler-80 And An Eighth Planet Around Kepler-90"](https://www.cfa.harvard.edu/~avanderb/kepler90i.pdf) (PDF). Retrieved 14 December 2017.

1. ^ [***a***](#cite_ref-NASAExoplanet_2-0) [***b***](#cite_ref-NASAExoplanet_2-1) [***c***](#cite_ref-NASAExoplanet_2-2) [***d***](#cite_ref-NASAExoplanet_2-3) [***e***](#cite_ref-NASAExoplanet_2-4) [***f***](#cite_ref-NASAExoplanet_2-5) [***g***](#cite_ref-NASAExoplanet_2-6) [***h***](#cite_ref-NASAExoplanet_2-7) [***i***](#cite_ref-NASAExoplanet_2-8) ["Kepler-90 i"](http://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=Kepler-90+i). *NASA Exoplanet Archive*. Retrieved 14 December 2017.

1. **[^](#cite_ref-NYT-20171214_3-0)** St. Fleur, Nicholas (14 December 2017). ["An 8th Planet Is Found Orbiting a Distant Star, With A.I.'s Help"](https://www.nytimes.com/2017/12/14/science/eight-planets-star-system.html). *[The New York Times](/source/The_New_York_Times)*. Retrieved 15 December 2017.

1. ^ [***a***](#cite_ref-NASA-20171214_4-0) [***b***](#cite_ref-NASA-20171214_4-1) Chou, Felecia; Hawkes, Alison; Northon, Karen (14 December 2017). ["Release 17-098 – Artificial Intelligence, NASA Data Used to Discover Eighth Planet Circling Distant Star"](https://www.nasa.gov/press-release/artificial-intelligence-nasa-data-used-to-discover-eighth-planet-circling-distant-star). *[NASA](/source/NASA)*. Retrieved 14 December 2017.

1. **[^](#cite_ref-NASA-20171214a_5-0)** Chou, Felicia; Hawkes, Alison; Landau, Elizabeth (14 December 2017). ["Artificial Intelligence, NASA Data Used to Discover Eighth Planet Circling Distant Star"](https://www.jpl.nasa.gov/news/news.php?feature=7026). *[NASA](/source/NASA)*. Retrieved 15 December 2017.

1. **[^](#cite_ref-UT-20080916_6-0)** Cain, Fraser (16 September 2008). ["How Old is the Sun?"](http://www.universetoday.com/18237/how-old-is-the-sun/). *[Universe Today](/source/Universe_Today)*. Retrieved 14 December 2017.

1. **[^](#cite_ref-UT-20080915_7-0)** Cain, Fraser (15 September 2008). ["Temperature of the Sun"](http://www.universetoday.com/18092/temperature-of-the-sun/). *[Universe Today](/source/Universe_Today)*. Retrieved 14 December 2017.

v t e The Kepler-90 system Kepler-90 Kepler-90b Kepler-90c Kepler-90i Kepler-90d Kepler-90e Kepler-90f Kepler-90g Kepler-90h

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Adapted from the Wikipedia article [Kepler-90i](https://en.wikipedia.org/wiki/Kepler-90i) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Kepler-90i?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.