LTT 1445 A c
LTT 1445 A c is a terrestrial planet orbiting LTT 1445 A in the constellation Eridanus. It lies about 22 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is LTT 1445 A c?
LTT 1445 A c has a radius of 1.15 times that of Earth. Its mass is 1.5 times that of Earth, giving it a density of 5.57 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is LTT 1445 A c in the Habitable Zone?
The position of LTT 1445 A c relative to the habitable zone of LTT 1445 A cannot be precisely determined from the available orbital data.
Temperature on LTT 1445 A c
The equilibrium temperature of LTT 1445 A c is about 508 K (235 °C) — hotter than anywhere on Earth. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 10.90 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on LTT 1445 A c — one full orbit around LTT 1445 A — lasts 3.12 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.027 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.22).
How Was LTT 1445 A c Discovered?
LTT 1445 A c was discovered in 2022 using the transit method, with observations from Transiting Exoplanet Survey Satellite (TESS).
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
How Far Away Is LTT 1445 A c?
LTT 1445 A c is 22.4 light-years (6.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 2004. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 394,240 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. LTT 1445 A c scores 0.39, ranking #515 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: LTT 1445 A
LTT 1445 A c belongs to a system of 3 stars; it orbits LTT 1445 A.
LTT 1445 A
- Mass
- 0.26 M☉
- Radius
- 0.27 R☉
The LTT 1445 A Planetary System
LTT 1445 A c is one of 2 known planets in the LTT 1445 A system. Its siblings:
- LTT 1445 A b (Super Earth)
LTT 1445 A c — Complete Data
| Radius | 1.147 Earth radii (0.102 Jupiter radii) |
|---|---|
| Mass | 1.54 Earth masses (0.005 Jupiter masses) |
| Density | 5.57 g/cm³ (Earth: 5.51) |
| Orbital period | 3.12 days |
| Orbital distance | 0.027 AU |
| Eccentricity | 0.223 |
| Equilibrium temperature | 508 K (235 °C) |
| Stellar irradiation | 10.90× Earth |
| Earth Similarity Index | 0.39 |
| Distance from Earth | 22.4 light-years (6.9 parsecs) |
| Constellation | Eridanus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2022-01-24. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About LTT 1445 A c
Is LTT 1445 A c habitable?
LTT 1445 A c is not known to orbit within the habitable zone of LTT 1445 A, and as a terrestrial planet it is an unlikely candidate for life as we know it.
How far away is LTT 1445 A c?
LTT 1445 A c is about 22 light-years from Earth in the constellation Eridanus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 394,240 years to get there.
How big is LTT 1445 A c compared to Earth?
LTT 1445 A c has 1.15 times the radius of Earth and about 1.5 times its mass.
How long is a year on LTT 1445 A c?
One orbit around LTT 1445 A takes 3.1 Earth days — short enough that 117 of its years would fit into one Earth year.
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