HD 158259 e
HD 158259 e is a super-Earth orbiting the G0 star HD 158259 in the constellation Draco. It lies about 88 light-years from Earth and was discovered in 2020 using the radial velocity method.
Is HD 158259 e in the Habitable Zone?
The position of HD 158259 e relative to the habitable zone of HD 158259 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 158259 e — one full orbit around HD 158259 — lasts 7.95 Earth days, shorter than Mercury's 88-day year.
How Was HD 158259 e Discovered?
HD 158259 e was discovered in 2020 using the radial velocity method, with observations from Haute-Provence Observatory.
The radial velocity method measures the subtle wobble of a star caused by the gravitational pull of an orbiting planet, visible as periodic shifts in the star's light spectrum. The size of the wobble reveals the planet's minimum mass.
How Far Away Is HD 158259 e?
HD 158259 e is 88.2 light-years (27.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1938. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,552,320 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. HD 158259 e scores 0.24, ranking #3,249 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 158259
HD 158259
- Spectral type
- G0
- Mass
- 1.08 M☉
- Radius
- 1.21 R☉
The HD 158259 Planetary System
HD 158259 e is one of 5 known planets in the HD 158259 system. Its siblings:
- HD 158259 b (Super Earth)
- HD 158259 c (Super Earth)
- HD 158259 d (Super Earth)
- HD 158259 f (Super Earth)
HD 158259 e — Complete Data
| Mass (best estimate) | 6.08 Earth masses |
|---|---|
| Orbital period | 7.95 days |
| Earth Similarity Index | 0.24 |
| Distance from Earth | 88.2 light-years (27.0 parsecs) |
| Constellation | Draco |
| Discovery method | Radial Velocity |
| Discovery facility | Haute-Provence Observatory |
| Discovery year | 2020 |
Data: NASA Exoplanet Archive, last updated 2020-04-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 158259 e
Is HD 158259 e habitable?
HD 158259 e is not known to orbit within the habitable zone of HD 158259, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is HD 158259 e?
HD 158259 e is about 88 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,552,320 years to get there.
How long is a year on HD 158259 e?
One orbit around HD 158259 takes 8.0 Earth days — short enough that 46 of its years would fit into one Earth year.
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