:INFO
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.

:STATS
[icon:TARGET] Radius | 1.15 Earth radii
[icon:CHART] Mass | 1.5 Earth masses
[icon:FIRE] Equilibrium temperature | 508 K (measured)
[icon:CLOCK] One year | 3.12 days
[icon:BOLT] Orbit radius | 0.0266 AU
[icon:STAR] Host star | LTT 1445 A at 3340 K
[icon:USERS] Distance | 22 light-years
[icon:TRENDING_DOWN] Starlight blocked | 0.157% at each transit

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

:TIMELINE
🔭🪐📅
2019-01-01 | LTT 1445 A b
2022-01-01 | LTT 1445 A c

:PATH
What the dip tells you
The fraction of starlight blocked sets the radius against the star's.

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

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

:NOTE
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.

:NOTE
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.

:LINK
https://exoplanetarchive.ipac.caltech.edu/overview/LTT%201445%20A%20c
NASA Exoplanet Archive: every published measurement of this planet