HD 213472 b
HD 213472 b is a cold gas giant orbiting HD 213472 in the constellation Lacerta. It lies about 210 light-years from Earth and was discovered in 2021 using the radial velocity method.
Is HD 213472 b in the Habitable Zone?
HD 213472 b orbits beyond the outer edge of the habitable zone of HD 213472. At that distance, any surface water would almost certainly be frozen.
Habitable zone of HD 213472: 1.061–2.503 AU (conservative: 1.344–2.373 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Orbit and Year Length
A year on HD 213472 b — one full orbit around HD 213472 — lasts 17,000.0 Earth days, longer than Jupiter's 12-year orbit. It orbits at an average distance of 13.000 AU. Its orbit is highly elliptical (eccentricity 0.53), swinging dramatically closer to and farther from its star.
How Was HD 213472 b Discovered?
HD 213472 b was discovered in 2021 using the radial velocity method, with observations from Multiple Observatories.
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 213472 b?
HD 213472 b is 210.2 light-years (64.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1816. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,699,520 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 213472 b scores 0.08, ranking #4,618 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 213472
HD 213472
- Surface temperature
- 5,730 K (Sun: 5,772 K)
- Mass
- 1.05 M☉
- Radius
- 1.43 R☉
Planetary System
HD 213472 b is the only planet known to orbit HD 213472 so far.
HD 213472 b — Complete Data
| Mass (best estimate) | 1,112.40 Earth masses |
|---|---|
| Orbital period | 17,000.00 days |
| Orbital distance | 13.000 AU |
| Eccentricity | 0.530 |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 210.2 light-years (64.5 parsecs) |
| Constellation | Lacerta |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-09-20. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 213472 b
Is HD 213472 b habitable?
No — HD 213472 b orbits outside the habitable zone of HD 213472 and is likely too cold for liquid water on its surface.
How far away is HD 213472 b?
HD 213472 b is about 210 light-years from Earth in the constellation Lacerta. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,699,520 years to get there.
How long is a year on HD 213472 b?
One orbit around HD 213472 takes 17,000.0 Earth days.
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