The star
The star
HD 148797
- Type
- F6
- Surface
- ≈ 6,441 K
- Size
- 1.55 × the Sun
- Mass
- 1.27 × the Sun
- Brightness
- 3.82 × the Sun
- Habitable zone
- 1.41–3.27 AU
The planets
HD 148797
HD 148797 b
- Year
- 42.10 days
- Distance from star
- 0.257 AU
- Mass
- 39 Earths
- Size
- 8.2 × Earth
- Temperature
- ≈ 762 K (+489 °C)
- Found
- 2026, transit (Transiting Exoplanet Survey Satellite (TESS))
HD 148797
HD 148797 c
- Year
- 68.15 days
- Distance from star
- 0.354 AU
- Mass
- 40 Earths
- Size
- 8.4 × Earth
- Temperature
- ≈ 650 K (+377 °C)
- Found
- 2026, 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.