The star
The star
TOI-237
- Type
- M4.5 V
- Surface
- ≈ 3,212 K
- Size
- 0.21 × the Sun
- Mass
- 0.18 × the Sun
- Brightness
- 0.0041 × the Sun
- Habitable zone
- 0.0525–0.138 AU
The planets
TOI-237
TOI-237 c
- Year
- 1.74 days
- Distance from star
- 0.016 AU
- Mass
- 1.9 Earths
- Size
- 1.2 × Earth
- Temperature
- ≈ 515 K (+242 °C)
- Found
- 2026, transit (La Silla Observatory)
TOI-237
TOI-237 b
- Year
- 5.44 days
- Distance from star
- 0.0341 AU
- Mass
- 2.7 Earths
- Size
- 1.4 × Earth
- Temperature
- ≈ 388 K (+115 °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.