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