HD 93083 b
HD 93083 b is a cold gas giant orbiting the K2 IV-V star HD 93083 in the constellation Antlia. It lies about 93 light-years from Earth and was discovered in 2005 using the radial velocity method. It orbits within the habitable zone of its star — the region where liquid water could exist on a planet's surface.
Is HD 93083 b in the Habitable Zone?
HD 93083 b orbits within the optimistic habitable zone of HD 93083 — the broader region where liquid water might be possible under favorable atmospheric conditions.
Habitable zone of HD 93083: 0.499–1.205 AU (conservative: 0.632–1.142 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HD 93083 b
HD 93083 b receives 1.59 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on HD 93083 b — one full orbit around HD 93083 — lasts 144.7 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.508 AU — comparable to the inner Solar System. Its orbit is mildly elliptical (eccentricity 0.12).
How Was HD 93083 b Discovered?
HD 93083 b was discovered in 2005 using the radial velocity method, with observations from La Silla 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 93083 b?
HD 93083 b is 93.0 light-years (28.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1933. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,636,800 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 93083 b scores 0.36, ranking #721 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 93083
HD 93083
- Spectral type
- K2 IV-V
- Surface temperature
- 5,034 K (Sun: 5,772 K)
- Mass
- 0.84 M☉
- Radius
- 0.84 R☉
- Luminosity
- 0.4070 L☉
- Age
- 10.7 billion years (Sun: 4.6)
The HD 93083 Planetary System
HD 93083 b is one of 2 known planets in the HD 93083 system. Its siblings:
- GJ 1137 c (Super Earth)
HD 93083 b — Complete Data
| Mass (best estimate) | 143.34 Earth masses |
|---|---|
| Orbital period | 144.72 days |
| Orbital distance | 0.508 AU |
| Eccentricity | 0.118 |
| Stellar irradiation | 1.59× Earth |
| Earth Similarity Index | 0.36 |
| Distance from Earth | 93.0 light-years (28.5 parsecs) |
| Constellation | Antlia |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2005 |
Data: NASA Exoplanet Archive, last updated 2026-04-30. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 93083 b
Is HD 93083 b habitable?
HD 93083 b orbits within the habitable zone of HD 93083, the region where liquid water could exist on a planet's surface. Whether it is actually habitable depends on its atmosphere and composition, which remain unknown.
How far away is HD 93083 b?
HD 93083 b is about 93 light-years from Earth in the constellation Antlia. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,636,800 years to get there.
How long is a year on HD 93083 b?
One orbit around HD 93083 takes 144.7 Earth days.
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