NASA (Exoplanet Catalog artwork)Kepler-90i
The eighth planet found by a neural network, tying our Solar System's planet count
Overview
Kepler-90i (also known by its Kepler Object of Interest designation KOI-351.08) is a super-Earth exoplanet with a radius 1.32 times that of Earth, orbiting the early G-type main sequence star Kepler-90 every 14.45 days, discovered by NASA's Kepler spacecraft. It is located about 2,840 light-years (870 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.
Source: Wikipedia
NASA: Kepler-90 i is a super Earth exoplanet that orbits a G-type star. Its mass is 2.3 Earths, it takes 14.4 days to complete one orbit of its star, and is 0.1201380843 AU from its star. Its discovery was announced in 2017.
Why it matters
- Discovered in 2017 by a Google machine-learning model trained on Kepler light curves.
- A hot, rocky planet on a 14.4-day orbit, about 2,500 light-years away.
- Kepler-90 became the first star known to host as many planets as the Sun.
NASA puts it this way: “Kepler-90 i is a super Earth exoplanet that orbits a G-type star. Its mass is 2.3 Earths, it takes 14.4 days to complete one orbit of its star, and is 0.120138 AU from its star. Its discovery was announced in 2017.”
Discovery & system
- Discovered
- 2017 · Transit · Kepler
- Discovery paper
- Shallue & Vanderburg 2018
- Discoverers
- Kepler Space Telescope
- Host star
- KOI-351 · 6,015 K · 1.12 M☉
- System
- 8 known planets
- Siblings
- KOI-351 b, KOI-351 c, KOI-351 d, KOI-351 e, KOI-351 f, KOI-351 g, KOI-351 h
The system
| World | Period | Distance | Radius | Mass | Temp. |
|---|---|---|---|---|---|
| KOI-351 b | 7.01 d | 0.074 AU | 1.31 R⊕ | 2.27 M⊕ | 1,062 K |
| KOI-351 c | 8.72 d | 0.089 AU | 1.19 R⊕ | 1.81 M⊕ | 987 K |
| Kepler-90 i | 14.4 d | 0.12 AU | 1.32 R⊕ | 2.3 M⊕ | 709 K |
| KOI-351 d | 59.7 d | 0.32 AU | 2.87 R⊕ | 8.6 M⊕ | 520 K |
| KOI-351 e | 91.9 d | 0.42 AU | 2.66 R⊕ | 7.56 M⊕ | 450 K |
| KOI-351 f | 124.9 d | 0.48 AU | 2.88 R⊕ | 8.65 M⊕ | 407 K |
| KOI-351 g | 210.7 d | 0.717 AU | 0.69 R♃ | 15 M⊕ | 342 K |
| KOI-351 h | 331.6 d | 0.971 AU | 1 R♃ | 0.64 M♃ | 294 K |
By the numbers
- Radius
- 1.32 R⊕8,410 km
- Mass
- 2.3 M⊕13.74 ×10²⁴ kg
- Orbital period
- 14.4 d0.04 yr
- Distance from star
- 0.12 AU18 million km
- Eccentricity
- 0nearly circular
- Equilibrium temp.
- 709 K436 °C
- Starlight received
- 129 × Earth
- Distance from Earth
- 2,767 ly848.3 pc
- Density
- 5.5 g/cm³1 × Earth
Sources
Image: NASA (Exoplanet Catalog artwork) · NASA media: generally free of copyright · image page
Text: Wikipedia (CC BY-SA 4.0). Taglines and highlights are editorial.