The HD 39091 System
HD 39091 is a planetary system in the constellation Mensa hosting 3 confirmed exoplanets, about 60 light-years from Earth.
Size Comparison: The Planets of HD 39091
Planets without a measured radius are not shown.
HD 39091: Star and Habitable Zone
HD 39091
- Surface temperature
- 5,998 K (Sun: 5,772 K)
- Mass
- 1.07 M☉
- Radius
- 1.17 R☉
- Age
- 3.9 billion years (Sun: 4.6)
Habitable zone of HD 39091: 0.934–2.188 AU (conservative: 1.183–2.074 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 39091 System
| Planet | Type | Orbit | Radius | ESI | Discovered |
|---|---|---|---|---|---|
| HD 39091 b | — | 2,089 d | — | 0.22 | 2001 |
| pi Men c | Mini Neptune | 6.3 d | 2.02 R⊕ | 0.26 | 2018 |
| pi Men d | Neptune-like | 125 d | — | 0.34 | 2022 |
Discovery History
The first planet found here, HD 39091 b, was discovered in 2001 using the radial velocity method. The most recent addition, pi Men d, followed in 2022.
- 2001 — HD 39091 b (Radial Velocity)
- 2018 — pi Men c (Transit)
- 2022 — pi Men d (Radial Velocity)
Frequently Asked Questions About HD 39091
How many planets does HD 39091 have?
HD 39091 has 3 confirmed exoplanets. More may await discovery.
Are any planets in the HD 39091 system habitable?
None of the known planets in HD 39091 orbit within the star's habitable zone.
How far away is HD 39091?
HD 39091 is about 60 light-years from Earth in the constellation Mensa.
Explore the HD 39091 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.
