The LTT 3780 system contains 2 exoplanets. It is located 71.69 light years away from the solar system.
| Mass | 0.4 solar masses |
| Radius | 0.37 solar radiae |
| Temperature | 3331 kelvin |
| Stellar Metallicity | 0.28 decimal exponent |
| Age | - billion years |
At 2.620 Earth masses, LTT 3780 b is a so called Super Earth. Super Earths could be terrestrial worlds like Earth, but they could also be ocean worlds or terrestrial worlds wrapped in a substantial atmosphere, in which case some refer to them as Mini Neptunes.
| Mass | 2.620 Earth masses |
| Density | 6.100 grams per cubic centimeter |
| Radius | 1.332 Earth radiae |
| Semi-major Axis | 0.01211 AU |
| Eccentricity | 0 |
| Orbital Period | 0.768 days |
| Discovery Method | Transit |
| Discovery Facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery Telescope | 0.1 m TESS Telescope |
| Discovery Instrument | TESS CCD Array |
| Discovery Date | 2020-07 |
| Reference | Cloutier et al. 2020 |
At more than 10 Earth masses, LTT 3780 c is an ice giant, a planet that is made up mostly of volatiles like water, amonia and methane, and enveloped by a dense hydrogen and helium atmosphere, much like Uranus and Neptune.
| Mass | 8.600 Earth masses |
| Density | 3.900 grams per cubic centimeter |
| Radius | 2.300 Earth radiae |
| Semi-major Axis | 0.07673 AU |
| Eccentricity | 0.06 |
| Orbital Period | 12.252 days |
| Discovery Method | Transit |
| Discovery Facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery Telescope | 0.1 m TESS Telescope |
| Discovery Instrument | TESS CCD Array |
| Discovery Date | 2020-07 |
| Reference | Cloutier et al. 2020 |