Exoplanet · Earth-sized rocky planet
Barnard d
Barnard d is a Earth-sized rocky planet orbiting the star Barnard's Star. Its year lasts 2.34 Earth days. It was discovered in 2025 by the Radial Velocity method.
| Host star | Barnard's Star |
|---|---|
| Distance | 5.96 light-years (1.83 pc) |
| Orbital period | 2.34 days |
| Orbital radius | 0.0188 AU |
| Eccentricity | 0.040 |
| Radius | 0.694 R⊕ · 0.0619 R♃ |
| Mass (minimum) | 0.263 M⊕ · 8.28 × 10⁻⁴ M♃ |
| Density | 4.32 g/cm³ |
| Equilibrium temperature | 483 K (210 °C) |
| Stellar flux received | 10 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2025 |
| Discovered by | Gemini Observatory |
Habitable zone
Inside the inner edge of the habitable zone: it receives 10 times the light the Earth does, too hot to keep liquid water on its surface.
Its star in the sky
In the planet's sky its star is a disc 5.2° across: 9.8 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 9.54. Visible from the whole Northern Hemisphere and south to latitude 85° S. It stands highest at midnight in June, the best time to observe it.
Light's journey
The light you see tonight set out around the year 2020. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 106 thousand years.
Planets in the same system
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.