Pr0211 b
Pr0211 b is a hot Jupiter orbiting Pr0211 in the constellation Cancer. It lies about 596 light-years from Earth and was discovered in 2012 using the radial velocity method.
Is Pr0211 b in the Habitable Zone?
Pr0211 b orbits inside the inner edge of the habitable zone of Pr0211. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Pr0211: 0.537–1.283 AU (conservative: 0.680–1.217 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 Pr0211 b — one full orbit around Pr0211 — lasts 2.15 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.032 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.011).
How Was Pr0211 b Discovered?
Pr0211 b was discovered in 2012 using the radial velocity method, with observations from Fred Lawrence Whipple 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 Pr0211 b?
Pr0211 b is 595.9 light-years (182.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1431. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 10,487,840 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. Pr0211 b scores 0.07, ranking #4,958 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Pr0211
Pr0211 b belongs to a system of 2 stars; it orbits Pr0211.
Pr0211
- Surface temperature
- 5,300 K (Sun: 5,772 K)
- Mass
- 0.94 M☉
- Radius
- 0.83 R☉
- Age
- 0.6 billion years (Sun: 4.6)
The Pr0211 Planetary System
Pr0211 b is one of 2 known planets in the Pr0211 system. Its siblings:
- Pr0211 c (Cold Gas Giant)
Pr0211 b — Complete Data
| Mass (best estimate) | 597.52 Earth masses |
|---|---|
| Orbital period | 2.15 days |
| Orbital distance | 0.032 AU |
| Eccentricity | 0.011 |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 595.9 light-years (182.7 parsecs) |
| Constellation | Cancer |
| Discovery method | Radial Velocity |
| Discovery facility | Fred Lawrence Whipple Observatory |
| Discovery year | 2012 |
Data: NASA Exoplanet Archive, last updated 2016-02-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Pr0211 b
Is Pr0211 b habitable?
No — Pr0211 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Pr0211 b?
Pr0211 b is about 596 light-years from Earth in the constellation Cancer. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 10,487,840 years to get there.
How long is a year on Pr0211 b?
One orbit around Pr0211 takes 2.1 Earth days — short enough that 170 of its years would fit into one Earth year.
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