The TOI-270 system contains 3 exoplanets. It is located 73.32 light years away from the solar system.
| Mass | 0.39 solar masses |
| Radius | 0.38 solar radiae |
| Temperature | 3506 kelvin |
| Stellar Metallicity | -0.2 decimal exponent |
| Age | - billion years |
At 1.580 Earth masses, TOI-270 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 | 1.580 Earth masses |
| Density | 4.970 grams per cubic centimeter |
| Radius | 1.206 Earth radiae |
| Semi-major Axis | 0.03197 AU |
| Eccentricity | 0.034 |
| Orbital Period | 3.360 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 | 2019-07 |
| Reference | Günther et al. 2019 |
At more than 10 Earth masses, TOI-270 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 | 6.150 Earth masses |
| Density | 2.600 grams per cubic centimeter |
| Radius | 2.355 Earth radiae |
| Semi-major Axis | 0.04526 AU |
| Eccentricity | 0.027 |
| Orbital Period | 5.661 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 | 2019-07 |
| Reference | Günther et al. 2019 |
With a mass below 5 Earth masses, a density of 2.72, and a semi-major axis of 0.0721 astronomical units, TOI-270 d could, potentially, be an ocean world - a planet with no dry land.
| Mass | 4.780 Earth masses |
| Density | 2.720 grams per cubic centimeter |
| Radius | 2.133 Earth radiae |
| Semi-major Axis | 0.0721 AU |
| Eccentricity | 0.032 |
| Orbital Period | 11.380 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 | 2019-07 |
| Reference | Günther et al. 2019 |