Pr0201 b
Pr0201 b is a hot Jupiter orbiting Pr0201 in the constellation Cancer. It lies about 589 light-years from Earth and was discovered in 2012 using the radial velocity method.
Is Pr0201 b in the Habitable Zone?
Pr0201 b orbits inside the inner edge of the habitable zone of Pr0201. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Pr0201: 0.962–2.246 AU (conservative: 1.218–2.129 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 Pr0201 b — one full orbit around Pr0201 — lasts 4.43 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.060 AU — closer to its star than Mercury is to the Sun.
How Was Pr0201 b Discovered?
Pr0201 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 Pr0201 b?
Pr0201 b is 589.2 light-years (180.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1437. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 10,369,920 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. Pr0201 b scores 0.07, ranking #5,042 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Pr0201
Pr0201
- Surface temperature
- 6,174 K (Sun: 5,772 K)
- Mass
- 1.24 M☉
- Radius
- 1.15 R☉
Planetary System
Pr0201 b is the only planet known to orbit Pr0201 so far.
Pr0201 b — Complete Data
| Mass (best estimate) | 171.63 Earth masses |
|---|---|
| Orbital period | 4.43 days |
| Orbital distance | 0.060 AU |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 589.2 light-years (180.6 parsecs) |
| Constellation | Cancer |
| Discovery method | Radial Velocity |
| Discovery facility | Fred Lawrence Whipple Observatory |
| Discovery year | 2012 |
Data: NASA Exoplanet Archive, last updated 2018-09-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Pr0201 b
Is Pr0201 b habitable?
No — Pr0201 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Pr0201 b?
Pr0201 b is about 589 light-years from Earth in the constellation Cancer. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 10,369,920 years to get there.
How long is a year on Pr0201 b?
One orbit around Pr0201 takes 4.4 Earth days — short enough that 83 of its years would fit into one Earth year.
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