The HD 28109 System
HD 28109 is a planetary system in the constellation Hydrus hosting 3 confirmed exoplanets, about 455 light-years from Earth.
Size Comparison: The Planets of HD 28109
HD 28109: Star and Habitable Zone
HD 28109
- Spectral type
- F8
- Surface temperature
- 6,189 K (Sun: 5,772 K)
- Mass
- 1.23 M☉
- Radius
- 1.43 R☉
- Luminosity
- 2.7100 L☉
- Age
- 3.2 billion years (Sun: 4.6)
Habitable zone of HD 28109: 1.205–2.812 AU (conservative: 1.526–2.666 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
All 3 Planets in the HD 28109 System
| Planet | Type | Orbit | Radius | ESI | Discovered |
|---|---|---|---|---|---|
| HD 28109 b | Mini Neptune | 23 d | 2.69 R⊕ | 0.25 | 2022 |
| HD 28109 c | Neptune-like | 56 d | 4.13 R⊕ | 0.21 | 2022 |
| HD 28109 d | Puffy Planet | 84 d | 3.11 R⊕ | 0.27 | 2022 |
Discovery History
The first planet found here, HD 28109 b, was discovered in 2022 using the transit method.
- 2022 — HD 28109 b (Transit)
- 2022 — HD 28109 c (Transit)
- 2022 — HD 28109 d (Transit)
Frequently Asked Questions About HD 28109
How many planets does HD 28109 have?
HD 28109 has 3 confirmed exoplanets. More may await discovery.
Are any planets in the HD 28109 system habitable?
None of the known planets in HD 28109 orbit within the star's habitable zone.
How far away is HD 28109?
HD 28109 is about 455 light-years from Earth in the constellation Hydrus.
Explore the HD 28109 system in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
