![Kepler-90 i: A 14.45 days Year](https://cdn.slatesource.com/3/e/d/3ed45371-b61e-480d-bafd-8b6f3b403260.webp)

# Kepler-90 i: A 14.45 days Year

- [Made in Slatesource](https://slatesource.com/@steph/kepler-90-i-a-14-45-days-year)
- By [Steph](https://slatesource.com/@steph)
- Created on Sep 19, 2026

## Super-earth around KOI-351

It is 1.32 times Earth's radius, closest in size to Earth. A year there lasts 14.45 days. Its equilibrium temperature is 709 K, hot enough to melt lead. The host star KOI-351 runs at 6015 K with 1.12 times the Sun's mass.

journey·5 Planets

# KOI-351 from the inside out

Orbit

/

Planet

"super-Earth, 1080 K.

"terrestrial, 985 K.

"mini-Neptune, 519 K.

"mini-Neptune, 453 K.

"mini-Neptune, 424 K.

Radius

1.32 Earth radii

Equilibrium temperature

709 K (measured)

One year

14.45 days

Host star

KOI-351 at 6015 K

Distance

2767 light-years

Starlight blocked

0.009% at each transit

What you get from the shadow

The depth of the dip is the ratio of the two discs, so the radius follows.

🔭🪐📅01.01.2013 – 01.01.2017

01.01.2013KOI-351 b, KOI-351 c, KOI-351 d, KOI-351 e, KOI-351 f

01.01.2013

01.01.2017Kepler-90 i

01.01.2017

Known and unknown, as the archive has it

0%

A size. Yes.

A mass. No.

A density, which decides rock or gas. No.

How far out it orbits. No.

A temperature someone observed rather than calculated. Yes.

An eccentricity, so we know if the orbit is a circle. No.

Everything known here comes from how much light went missing. That fixes the size and leaves the mass entirely open.

KOI-351 has 8 known planets. Multi-planet systems are where orbital dynamics can be measured rather than assumed.

Found by Kepler in 2017. Kepler stared at one patch of sky for four years, which is why so many of its planets have short periods: a planet only counts once you have seen it cross several times.

[NASA Exoplanet Archive: source data, including the values not used here](https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-90%20i?utm_source=slatesource)