HD 102272 b
HD 102272 b is a cold gas giant orbiting HD 102272 in the constellation Leo. It lies about 1,132 light-years from Earth and was discovered in 2008 using the radial velocity method.
Is HD 102272 b in the Habitable Zone?
HD 102272 b orbits inside the inner edge of the habitable zone of HD 102272. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 102272: 5.597–13.651 AU (conservative: 7.090–12.942 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 102272 b — one full orbit around HD 102272 — lasts 127.6 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.510 AU — comparable to the inner Solar System. Its orbit is mildly elliptical (eccentricity 0.05).
How Was HD 102272 b Discovered?
HD 102272 b was discovered in 2008 using the radial velocity method, with observations from McDonald 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 102272 b?
HD 102272 b is 1,132.1 light-years (347.1 parsecs) from Earth. Light arriving here tonight left the planet about 1,132 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 19,924,960 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 102272 b scores 0.08, ranking #4,782 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 102272
HD 102272
- Surface temperature
- 4,790 K (Sun: 5,772 K)
- Mass
- 1.45 M☉
- Radius
- 10.30 R☉
Planetary System
HD 102272 b is the only planet known to orbit HD 102272 so far.
HD 102272 b — Complete Data
| Mass (best estimate) | 1,570.08 Earth masses |
|---|---|
| Orbital period | 127.58 days |
| Orbital distance | 0.510 AU |
| Eccentricity | 0.050 |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 1,132.1 light-years (347.1 parsecs) |
| Constellation | Leo |
| Discovery method | Radial Velocity |
| Discovery facility | McDonald Observatory |
| Discovery year | 2008 |
Data: NASA Exoplanet Archive, last updated 2018-09-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 102272 b
Is HD 102272 b habitable?
No — HD 102272 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 102272 b?
HD 102272 b is about 1,132 light-years from Earth in the constellation Leo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 19,924,960 years to get there.
How long is a year on HD 102272 b?
One orbit around HD 102272 takes 127.6 Earth days.
Explore HD 102272 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.
