Exoplanet · Earth-sized rocky planet
Ross 128 b
Ross 128 b is a Earth-sized rocky planet orbiting the star Ross 128. Its year lasts 9.87 Earth days. It was discovered in 2017 by the Radial Velocity method.
| Host star | Ross 128 |
|---|---|
| Distance | 11.0 light-years (3.37 pc) |
| Orbital period | 9.87 days |
| Orbital radius | 0.0496 AU |
| Eccentricity | 0.116 |
| Radius | 1.11 R⊕ · 0.099 R♃ |
| Mass (minimum) | 1.4 M⊕ · 0.00441 M♃ |
| Density | 5.63 g/cm³ |
| Equilibrium temperature | 301 K (28 °C) |
| Stellar flux received | 1.38 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2017 |
| Discovered by | La Silla Observatory |
Habitable zone
At the edge of the habitable zone (within the optimistic limits): liquid water would be possible only with a favourable atmosphere.
Its star in the sky
In the planet's sky its star is a disc 2.1° across: 4 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 11.12. Visible from the whole Northern Hemisphere and south to latitude 89° S. It stands highest at midnight in March, the best time to observe it.
Light's journey
The light you see tonight set out around the year 2015. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 195 thousand years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.