LTT 3780 is 71.7 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this M3.5 V star; the first was found in 2020 by transit (Transiting Exoplanet Survey Satellite (TESS)).
Fly there in 3DLTT 3780 b goes round its star every 18.4 hours, 115 times as often as Mercury goes round the Sun.
LTT 3780 is one of 2 stars in its system: the other is drawn where the Washington Double Star Catalog measures it on the sky.
| Spectral type | M3.5 V |
| Surface temperature | 3,358 K |
| Mass | 0.381 solar masses |
| Radius | 0.38 solar radii |
| Luminosity | 0.0165 times the Sun |
| Apparent magnitude | 13.14 |
| Age | about 3.1 billion years |
| Distance from the Sun | 71.7 light-years (22.0 parsecs) |
| Position (J2000) | RA 154.6449°, Dec -11.7178° |
| Constellation | Hydra |
LTT 3780 B is a M3.5V star of magnitude 16.43, moving through space with it. In 2015 it was 15.8″ from LTT 3780, at position angle 97° (Washington Double Star Catalog, 10185-1143 LDS3977): 347 AU on the sky at this distance. The true distance can only be larger.
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| LTT 3780 b | 18.4 hours | 0.0120 AU | 1.325 R⊕ | 2.46 M⊕ | Transit, 2020 |
| LTT 3780 c | 12.3 days | 0.0757 AU | 2.39 R⊕ | 8.04 M⊕ | Transit, 2020 |
Values are the NASA Exoplanet Archive’s composite parameters. A radius marked estimated comes from a mass–radius relation; a mass marked minimum is M sin i. Planet sizes and colours in the 3D view are renderings: none of these worlds has been photographed as more than a point of light.