![LTT 1445 A b: 22 Light-Years Away](https://cdn.slatesource.com/6/9/1/6916576e-c470-4c0a-80ed-bb56c315868f.webp)

# LTT 1445 A b: 22 Light-Years Away

- [Made in Slatesource](https://slatesource.com/@steph/ltt-1445-a-b-22-light-years-away)
- By [Steph](https://slatesource.com/@steph)
- Created on Sep 19, 2026

## Super-earth around LTT 1445 A

It is 1.34 times Earth's radius, closest in size to Earth, and 2.7 times Earth's mass, at 6.20 g/cm3, denser than Earth. A year there lasts 5.36 days, on an orbit 10 times closer to its star than Mercury is to the Sun. Its equilibrium temperature is 431 K, hotter than any desert.

Radius

1.34 Earth radii

Mass

2.7 Earth masses

Equilibrium temperature

431 K (measured)

One year

5.36 days

Orbit radius

0.0381 AU

Distance

22 light-years

Starlight blocked

0.205% at each transit

**22.4** light-years: close enough to be a follow-up target

🔭🪐📅01.01.2019 – 01.01.2022

01.01.2019LTT 1445 A b

01.01.2019

01.01.2022LTT 1445 A c

01.01.2022

What you get from the shadow

The fraction of starlight blocked sets the radius against the star's.

LTT 1445 A has 2 known planets. Multi-planet systems are where orbital dynamics can be measured rather than assumed.

Found by Transiting Exoplanet Survey Satellite (TESS) in 2019. 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.

The size came from a crossing, the mass did not. That pairing is uncommon and it is what lets anyone say whether this is rock or gas.

[NASA Exoplanet Archive: source data, including the values not used here](https://exoplanetarchive.ipac.caltech.edu/overview/LTT%201445%20A%20b?utm_source=slatesource)