The star
The star
HD 73583
- Type
- K4 V
- Surface
- ≈ 4,511 K
- Size
- 0.65 × the Sun
- Mass
- 0.73 × the Sun
- Brightness
- 0.18 × the Sun
- Habitable zone
- 0.339–0.838 AU
The planets
HD 73583
HD 73583 b
- Year
- 6.40 days
- Distance from star
- 0.0604 AU
- Mass
- 10 Earths
- Size
- 2.8 × Earth
- Temperature
- ≈ 714 K (+441 °C)
- Found
- 2022, transit (Transiting Exoplanet Survey Satellite (TESS))
HD 73583
HD 73583 c
- Year
- 18.88 days
- Distance from star
- 0.124 AU
- Mass
- 9.7 Earths
- Size
- 2.4 × Earth
- Temperature
- ≈ 498 K (+225 °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.