The star
The star
TOI-700
- Type
- M2.5 V
- Surface
- ≈ 3,459 K
- Size
- 0.41 × the Sun
- Mass
- 0.42 × the Sun
- Brightness
- 0.0233 × the Sun
- Habitable zone
- 0.125–0.325 AU
The planets
TOI-700
TOI-700 b
- Year
- 9.98 days
- Distance from star
- 0.0678 AU
- Mass
- 0.85 Earths
- Size
- 0.96 × Earth
- Temperature
- ≈ 417 K (+144 °C)
- Found
- 2020, transit (Transiting Exoplanet Survey Satellite (TESS))
TOI-700
TOI-700 c
- Year
- 16.05 days
- Distance from star
- 0.0931 AU
- Mass
- 7 Earths
- Size
- 2.5 × Earth
- Temperature
- ≈ 356 K (+83 °C)
- Found
- 2020, transit (Transiting Exoplanet Survey Satellite (TESS))
TOI-700
TOI-700 e
- Year
- 27.81 days
- Distance from star
- 0.134 AU
- Mass
- 0.72 Earths
- Size
- 0.92 × Earth
- Temperature
- ≈ 273 K (-0 °C)
- Found
- 2023, transit (Transiting Exoplanet Survey Satellite (TESS))
TOI-700
TOI-700 d
- Year
- 37.42 days
- Distance from star
- 0.164 AU
- Mass
- 1.6 Earths
- Size
- 1.1 × Earth
- Temperature
- ≈ 269 K (-4 °C)
- Found
- 2020, transit (Transiting Exoplanet Survey Satellite (TESS))
Masses found by the wobble method are minimums, because the orbit's tilt is unknown. Temperatures are equilibrium estimates for a bare planet, before any atmosphere.
How we know
The shadow
The planet passes in front of its star and dims it by a fraction of a percent, every orbit. The dip gives the planet's size and year.
Sources
- Planet and star parameters: NASA Exoplanet Archive, Planetary Systems Composite Parameters, retrieved 1 Nov 2026. This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with NASA under the Exoplanet Exploration Program.
- Position: HYG Database v4.1 (CC BY-SA 4.0).
- Habitable zone: a simple estimate from the star's brightness (√L × 0.95 to 1.67 AU), shown as a guide.