Star system, 50 light-years
51 Pegasi and its one planet
51 Peg b is an exoplanet about 14.1 times Earth's width (a size estimated from its mass), about 1.3 times Jupiter's, 50 light-years away, orbiting closer to its star than the habitable zone we compute for it.
51 Pegasi is a star of spectral type G5V, 50 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.
51 Peg b
51 Peg b is an exoplanet about 14.1 times Earth's width (a size estimated from its mass), about 1.3 times Jupiter's, 50 light-years away, orbiting closer to its star than the habitable zone we compute for it.
- Width
- 14.1 × Earth's estimated
- Mass
- 193.875 times Earth's measured
- One year
- 4.2308 days measured
- Distance from its star
- 0.052 au from the Archive
- Temperature of a bare ball there
- 1,208 K computed, not measured
- Starlight, against Earth's
- 506 × 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 1995. Its orbit is closer to its star than the habitable zone computed for it.
See 51 Peg b in 3D · The picture is an artist's impression.
The star
- Surface temperature
- 5,761 K
- Width
- 1.19 × the Sun's
- Mass
- 1.07 × the Sun's
- Spectral type
- G5V
- Distance
- 50 light-years
- Habitable zone, computed
- 1.113 to 1.964 au from the star