Star system, 11 light-years
Ross 128 and its one planet
Ross 128 b is an exoplanet about 1.11 times Earth's width (a size estimated from its mass), 11 light-years away, orbiting at the edge of its star's computed habitable zone.
Ross 128 is a star of spectral type M4, 11 light-years from us, with one known planet.
Drawn at the system's own scale, every orbit from the Archive's numbers.
What is measured, what is computed, what is imagined.
measured The period, and where the table says so the width and the mass, by the method named in each section.
computed Anything marked computed: the size of an orbit where Kepler's third law corrects the table, the temperature of a bare ball at that distance, the starlight received, and the habitable zone.
imagined The picture is an artist's impression. Nobody has seen the surface of a planet of another star: its colour, clouds and land are not known, and the share picture says so in its corner.
Ross 128 b
Ross 128 b is an exoplanet about 1.11 times Earth's width (a size estimated from its mass), 11 light-years away, orbiting at the edge of its star's computed habitable zone.
- Width
- 1.11 × Earth's estimated
- Mass
- at least 1.4 times Earth's measured
- One year
- 9.8658 days measured
- Distance from its star
- 0.0496 au from the Archive
- Temperature of a bare ball there
- 280 K computed, not measured
- Starlight, against Earth's
- 1.47 × computed
It was found by the back-and-forth wobble its pull puts into its star's motion, seen as a shift in the colour of the star's light in 2017. Its orbit lies at the edge of the conservative habitable zone computed for its star.
See Ross 128 b in 3D · The picture is an artist's impression.
The star
- Surface temperature
- 3,192 K
- Width
- 0.197 × the Sun's
- Mass
- 0.168 × the Sun's
- Spectral type
- M4
- Distance
- 11 light-years
- Habitable zone, computed
- 0.06254 to 0.1233 au from the star