![LTT 1445 A c: 22 Light-Years Away](https://cdn.slatesource.com/f/e/5/fe597e25-1dda-47d1-95c1-38c902c95c21.webp)

# LTT 1445 A c: 22 Light-Years Away

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

## Terrestrial around LTT 1445 A

It is 1.15 times Earth's radius, closest in size to Earth, and 1.5 times Earth's mass, at 5.57 g/cm3, denser than Earth. A year there lasts 3.12 days, on an orbit 15 times closer to its star than Mercury is to the Sun. Its equilibrium temperature is 508 K, hotter than any desert. The host star LTT 1445 A runs at 3340 K with 0.26 times the Sun's mass.

Radius

1.15 Earth radii

Mass

1.5 Earth masses

Equilibrium temperature

508 K (measured)

One year

3.12 days

Orbit radius

0.0266 AU

Host star

LTT 1445 A at 3340 K

Distance

22 light-years

Starlight blocked

0.157% 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 the dip tells you

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.

Its orbit is noticeably elliptical, eccentricity 0.22, so the starlight it receives changes substantially over one year.

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.

Two independent measurements sit behind this page: a dip in starlight for the size, and something else entirely for the mass. Together they make a density.

[NASA Exoplanet Archive: every published measurement of this planet](https://exoplanetarchive.ipac.caltech.edu/overview/LTT%201445%20A%20c?utm_source=slatesource)