LTT 1445 A c: 22 Light-Years Away
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
22.4light-years: close enough to be a follow-up target
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.
