HD 220074 b
HD 220074 b is a exoplanet orbiting HD 220074 in the constellation Cassiopeia. It lies about 1,059 light-years from Earth and was discovered in 2012 using the radial velocity method.
Is HD 220074 b in the Habitable Zone?
HD 220074 b orbits inside the inner edge of the habitable zone of HD 220074. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 220074: 19.215–49.155 AU (conservative: 24.339–46.603 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 220074 b — one full orbit around HD 220074 — lasts 672.1 Earth days, longer than an Earth year. It orbits at an average distance of 1.600 AU. Its orbit is mildly elliptical (eccentricity 0.14).
How Was HD 220074 b Discovered?
HD 220074 b was discovered in 2012 using the radial velocity method, with observations from Bohyunsan Optical Astronomical 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 220074 b?
HD 220074 b is 1,058.5 light-years (324.5 parsecs) from Earth. Light arriving here tonight left the planet about 1,059 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 18,629,600 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 220074 b scores 0.08, ranking #4,763 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 220074
HD 220074
- Surface temperature
- 3,787 K (Sun: 5,772 K)
- Mass
- 2.20 M☉
- Radius
- 54.92 R☉
Planetary System
HD 220074 b is the only planet known to orbit HD 220074 so far.
HD 220074 b — Complete Data
| Mass (best estimate) | 5,288.69 Earth masses |
|---|---|
| Orbital period | 672.10 days |
| Orbital distance | 1.600 AU |
| Eccentricity | 0.140 |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 1,058.5 light-years (324.5 parsecs) |
| Constellation | Cassiopeia |
| Discovery method | Radial Velocity |
| Discovery facility | Bohyunsan Optical Astronomical Observatory |
| Discovery year | 2012 |
Data: NASA Exoplanet Archive, last updated 2018-09-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 220074 b
Is HD 220074 b habitable?
No — HD 220074 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 220074 b?
HD 220074 b is about 1,059 light-years from Earth in the constellation Cassiopeia. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 18,629,600 years to get there.
How long is a year on HD 220074 b?
One orbit around HD 220074 takes 672.1 Earth days.
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