HD 45652 b
HD 45652 b is a cold gas giant orbiting the G8/K0 star HD 45652 in the constellation Monoceros. It lies about 114 light-years from Earth and was discovered in 2008 using the radial velocity method.
Is HD 45652 b in the Habitable Zone?
HD 45652 b orbits inside the inner edge of the habitable zone of HD 45652. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 45652: 0.613–1.466 AU (conservative: 0.776–1.390 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 45652 b — one full orbit around HD 45652 — lasts 44.1 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.237 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.61), swinging dramatically closer to and farther from its star.
How Was HD 45652 b Discovered?
HD 45652 b was discovered in 2008 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 45652 b?
HD 45652 b is 113.7 light-years (34.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1913. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,001,120 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 45652 b scores 0.13, ranking #4,281 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 45652
HD 45652
- Spectral type
- G8/K0
- Surface temperature
- 5,294 K (Sun: 5,772 K)
- Mass
- 0.92 M☉
- Radius
- 0.94 R☉
- Luminosity
- 0.6310 L☉
- Age
- 8.4 billion years (Sun: 4.6)
Planetary System
HD 45652 b is the only planet known to orbit HD 45652 so far.
HD 45652 b — Complete Data
| Mass (best estimate) | 137.62 Earth masses |
|---|---|
| Orbital period | 44.07 days |
| Orbital distance | 0.237 AU |
| Eccentricity | 0.607 |
| Earth Similarity Index | 0.13 |
| Distance from Earth | 113.7 light-years (34.9 parsecs) |
| Constellation | Monoceros |
| Discovery method | Radial Velocity |
| Discovery facility | Haute-Provence Observatory |
| Discovery year | 2008 |
Data: NASA Exoplanet Archive, last updated 2018-09-25. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 45652 b
Is HD 45652 b habitable?
No — HD 45652 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 45652 b?
HD 45652 b is about 114 light-years from Earth in the constellation Monoceros. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,001,120 years to get there.
How long is a year on HD 45652 b?
One orbit around HD 45652 takes 44.1 Earth days.
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