K2-49 b
K2-49 b is a super-Earth orbiting K2-49 in the constellation Virgo. It lies about 1,491 light-years from Earth and was discovered in 2016 using the transit method.
How Big Is K2-49 b?
K2-49 b has a radius of 1.93 times that of Earth.
Is K2-49 b in the Habitable Zone?
K2-49 b orbits inside the inner edge of the habitable zone of K2-49. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of K2-49: 0.190–0.476 AU (conservative: 0.240–0.451 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on K2-49 b
K2-49 b receives 59.00 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on K2-49 b — one full orbit around K2-49 — lasts 2.77 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.031 AU — closer to its star than Mercury is to the Sun.
How Was K2-49 b Discovered?
K2-49 b was discovered in 2016 using the transit method, with observations from K2.
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
How Far Away Is K2-49 b?
K2-49 b is 1,490.9 light-years (457.1 parsecs) from Earth. Light arriving here tonight left the planet about 1,491 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 26,239,840 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. K2-49 b scores 0.27, ranking #2,723 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: K2-49
K2-49
- Surface temperature
- 4,175 K (Sun: 5,772 K)
- Mass
- 0.51 M☉
- Radius
- 0.45 R☉
Planetary System
K2-49 b is the only planet known to orbit K2-49 so far.
K2-49 b — Complete Data
| Radius | 1.930 Earth radii (0.172 Jupiter radii) |
|---|---|
| Orbital period | 2.77 days |
| Orbital distance | 0.031 AU |
| Stellar irradiation | 59.00× Earth |
| Earth Similarity Index | 0.27 |
| Distance from Earth | 1,490.9 light-years (457.1 parsecs) |
| Constellation | Virgo |
| Discovery method | Transit |
| Discovery facility | K2 |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2016-07-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About K2-49 b
Is K2-49 b habitable?
No — K2-49 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is K2-49 b?
K2-49 b is about 1,491 light-years from Earth in the constellation Virgo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 26,239,840 years to get there.
How big is K2-49 b compared to Earth?
K2-49 b has 1.93 times the radius of Earth.
How long is a year on K2-49 b?
One orbit around K2-49 takes 2.8 Earth days — short enough that 132 of its years would fit into one Earth year.
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