HIP 57274 b
HIP 57274 b is a super-Earth orbiting HIP 57274 in the constellation Ursa Major. It lies about 84 light-years from Earth and was discovered in 2011 using the radial velocity method.
Is HIP 57274 b in the Habitable Zone?
HIP 57274 b orbits inside the inner edge of the habitable zone of HIP 57274. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HIP 57274: 0.380–0.938 AU (conservative: 0.481–0.889 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Orbit and Year Length
A year on HIP 57274 b — one full orbit around HIP 57274 — lasts 8.14 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.070 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.19).
How Was HIP 57274 b Discovered?
HIP 57274 b was discovered in 2011 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 HIP 57274 b?
HIP 57274 b is 84.3 light-years (25.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1942. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,483,680 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. HIP 57274 b scores 0.24, ranking #3,329 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HIP 57274
HIP 57274
- Surface temperature
- 4,510 K (Sun: 5,772 K)
- Mass
- 0.29 M☉
- Radius
- 0.78 R☉
The HIP 57274 Planetary System
HIP 57274 b is one of 3 known planets in the HIP 57274 system. Its siblings:
- HIP 57274 c (Cold Gas Giant)
- HIP 57274 d (Cold Gas Giant)
HIP 57274 b — Complete Data
| Mass (best estimate) | 6.36 Earth masses |
|---|---|
| Orbital period | 8.14 days |
| Orbital distance | 0.070 AU |
| Eccentricity | 0.190 |
| Earth Similarity Index | 0.24 |
| Distance from Earth | 84.3 light-years (25.9 parsecs) |
| Constellation | Ursa Major |
| Discovery method | Radial Velocity |
| Discovery facility | W. M. Keck Observatory |
| Discovery year | 2011 |
Data: NASA Exoplanet Archive, last updated 2018-09-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HIP 57274 b
Is HIP 57274 b habitable?
No — HIP 57274 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HIP 57274 b?
HIP 57274 b is about 84 light-years from Earth in the constellation Ursa Major. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,483,680 years to get there.
How long is a year on HIP 57274 b?
One orbit around HIP 57274 takes 8.1 Earth days — short enough that 45 of its years would fit into one Earth year.
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