HD 33283 b
HD 33283 b is a cold gas giant orbiting the G3/G5 V star HD 33283 in the constellation Lepus. It lies about 293 light-years from Earth and was discovered in 2006 using the radial velocity method.
Is HD 33283 b in the Habitable Zone?
HD 33283 b orbits inside the inner edge of the habitable zone of HD 33283. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 33283: 1.553–3.645 AU (conservative: 1.967–3.455 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on HD 33283 b — one full orbit around HD 33283 — lasts 18.2 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.151 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.40), swinging dramatically closer to and farther from its star.
How Was HD 33283 b Discovered?
HD 33283 b was discovered in 2006 using the radial velocity method, with observations from W. M. Keck 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 33283 b?
HD 33283 b is 293.1 light-years (89.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1733. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 5,158,560 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 33283 b scores 0.08, ranking #4,760 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 33283
HD 33283 b belongs to a system of 2 stars; it orbits HD 33283.
HD 33283
- Spectral type
- G3/G5 V
- Surface temperature
- 5,935 K (Sun: 5,772 K)
- Mass
- 1.38 M☉
- Radius
- 1.97 R☉
- Luminosity
- 4.3652 L☉
- Age
- 3.6 billion years (Sun: 4.6)
Planetary System
HD 33283 b is the only planet known to orbit HD 33283 so far.
HD 33283 b — Complete Data
| Mass (best estimate) | 104.57 Earth masses |
|---|---|
| Orbital period | 18.20 days |
| Orbital distance | 0.151 AU |
| Eccentricity | 0.399 |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 293.1 light-years (89.9 parsecs) |
| Constellation | Lepus |
| Discovery method | Radial Velocity |
| Discovery facility | W. M. Keck Observatory |
| Discovery year | 2006 |
Data: NASA Exoplanet Archive, last updated 2018-09-25. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 33283 b
Is HD 33283 b habitable?
No — HD 33283 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 33283 b?
HD 33283 b is about 293 light-years from Earth in the constellation Lepus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 5,158,560 years to get there.
How long is a year on HD 33283 b?
One orbit around HD 33283 takes 18.2 Earth days — short enough that 20 of its years would fit into one Earth year.
Explore HD 33283 b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
