The star
The star
HD 109833
- Type
- yellow star
- Surface
- ≈ 5,881 K
- Size
- 1.00 × the Sun
- Mass
- 1.08 × the Sun
- Brightness
- 1.18 × the Sun
- Habitable zone
- 0.81–1.9 AU
The planets
HD 109833
HD 109833 b
- Year
- 9.19 days
- Distance from star
- 0.0881 AU
- Mass
- 8.7 Earths
- Size
- 2.9 × Earth
- Temperature
- ≈ 786 K (+513 °C)
- Found
- 2022, transit (Transiting Exoplanet Survey Satellite (TESS))
HD 109833
HD 109833 c
- Year
- 13.90 days
- Distance from star
- 0.116 AU
- Mass
- 7.2 Earths
- Size
- 2.6 × Earth
- Temperature
- ≈ 757 K (+484 °C)
- Found
- 2022, 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.