HD 83443 b
HD 83443 b is a hot Jupiter orbiting the K0 V star HD 83443 in the constellation Vela. It lies about 133 light-years from Earth and was discovered in 2002 using the radial velocity method.
Is HD 83443 b in the Habitable Zone?
HD 83443 b orbits inside the inner edge of the habitable zone of HD 83443. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 83443: 0.679–1.616 AU (conservative: 0.860–1.532 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 83443 b — one full orbit around HD 83443 — lasts 2.99 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.041 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.012).
How Was HD 83443 b Discovered?
HD 83443 b was discovered in 2002 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 83443 b?
HD 83443 b is 133.4 light-years (40.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1893. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,347,840 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 83443 b scores 0.07, ranking #5,028 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 83443
HD 83443
- Spectral type
- K0 V
- Surface temperature
- 5,442 K (Sun: 5,772 K)
- Mass
- 1.00 M☉
- Radius
- 0.94 R☉
- Luminosity
- 0.7870 L☉
- Age
- 2.6 billion years (Sun: 4.6)
The HD 83443 Planetary System
HD 83443 b is one of 2 known planets in the HD 83443 system. Its siblings:
- HD 83443 c (Cold Gas Giant)
HD 83443 b — Complete Data
| Mass (best estimate) | 127.77 Earth masses |
|---|---|
| Orbital period | 2.99 days |
| Orbital distance | 0.041 AU |
| Eccentricity | 0.012 |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 133.4 light-years (40.9 parsecs) |
| Constellation | Vela |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2002 |
Data: NASA Exoplanet Archive, last updated 2022-06-08. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 83443 b
Is HD 83443 b habitable?
No — HD 83443 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 83443 b?
HD 83443 b is about 133 light-years from Earth in the constellation Vela. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,347,840 years to get there.
How long is a year on HD 83443 b?
One orbit around HD 83443 takes 3.0 Earth days — short enough that 122 of its years would fit into one Earth year.
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