HD 210193 b
HD 210193 b is a cold gas giant orbiting the G3 V star HD 210193 in the constellation Grus. It lies about 138 light-years from Earth and was discovered in 2019 using the radial velocity method.
Is HD 210193 b in the Habitable Zone?
The position of HD 210193 b relative to the habitable zone of HD 210193 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 210193 b — one full orbit around HD 210193 — lasts 649.9 Earth days, longer than an Earth year. It orbits at an average distance of 1.487 AU. Its orbit is mildly elliptical (eccentricity 0.24).
How Was HD 210193 b Discovered?
HD 210193 b was discovered in 2019 using the radial velocity method, with observations from Las Campanas 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 210193 b?
HD 210193 b is 137.6 light-years (42.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1889. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,421,760 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 210193 b scores 0.35, ranking #777 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 210193
HD 210193
- Spectral type
- G3 V
- Surface temperature
- 5,790 K (Sun: 5,772 K)
- Mass
- 1.04 M☉
Planetary System
HD 210193 b is the only planet known to orbit HD 210193 so far.
HD 210193 b — Complete Data
| Mass (best estimate) | 153.10 Earth masses |
|---|---|
| Orbital period | 649.92 days |
| Orbital distance | 1.487 AU |
| Eccentricity | 0.240 |
| Earth Similarity Index | 0.35 |
| Distance from Earth | 137.6 light-years (42.2 parsecs) |
| Constellation | Grus |
| Discovery method | Radial Velocity |
| Discovery facility | Las Campanas Observatory |
| Discovery year | 2019 |
Data: NASA Exoplanet Archive, last updated 2019-05-20. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 210193 b
Is HD 210193 b habitable?
HD 210193 b is not known to orbit within the habitable zone of HD 210193, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 210193 b?
HD 210193 b is about 138 light-years from Earth in the constellation Grus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,421,760 years to get there.
How long is a year on HD 210193 b?
One orbit around HD 210193 takes 649.9 Earth days.
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