![TOI-1246 e: 4-Planet System, 0.212 AU Out](https://cdn.slatesource.com/a/8/0/a806aafe-0933-46c7-b5a0-a039c5301e48.webp)

# TOI-1246 e: 4-Planet System, 0.212 AU Out

- [Made in Slatesource](https://slatesource.com/@steph/toi-1246-e-4-planet-system-0-212-au-out)
- By [Steph](https://slatesource.com/@steph)
- Created on Sep 19, 2026

## Mini-neptune around TOI-1246

It is 3.51 times Earth's radius, closest in size to Neptune, and 14.5 times Earth's mass, at 1.83 g/cm3, less dense than Earth. A year there lasts 37.93 days, on an orbit 2 times closer to its star than Mercury is to the Sun. Its equilibrium temperature is 464 K, hotter than any desert. The host star TOI-1246 runs at 5213 K with 0.89 times the Sun's mass.

journey·4 Planets

# TOI-1246 from the inside out

Orbit

/

Planet

"mini-Neptune, 955 K.

"mini-Neptune, 862 K.

"mini-Neptune, 588 K.

"mini-Neptune, 464 K.

Radius

3.51 Earth radii

Mass

14.5 Earth masses

Equilibrium temperature

464 K (measured)

One year

37.93 days

Orbit radius

0.2120 AU

Host star

TOI-1246 at 5213 K

Distance

553 light-years

Starlight blocked

0.138% at each transit

What you get from the shadow

How deep the star dims fixes the planet's size relative to it.

TOI-1246 has 4 known planets. Systems like this are the ones where architecture can be studied instead of guessed at.

Found by Transiting Exoplanet Survey Satellite (TESS) in 2022. TESS scans most of the sky in 27-day stretches, so it favours bright nearby stars and short orbits over the faint distant ones Kepler specialised in.

Size from the shadow, mass from elsewhere. Most transiting planets never get the second half, and without it composition stays a guess.

[Every parameter ever published for TOI-1246 e, at the NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/TOI-1246%20e?utm_source=slatesource)