KOI-13 b
KOI-13 b is a hot Jupiter orbiting KOI-13 in the constellation Lyra. It lies about 1,693 light-years from Earth and was discovered in 2011 using the transit method.
How Big Is KOI-13 b?
KOI-13 b has a radius of 16.95 times that of Earth, or 1.51 times the radius of Jupiter. Its mass is 2,949 times that of Earth, giving it a density of 3.60 g/cm³ — between that of rocky and gaseous planets.
Is KOI-13 b in the Habitable Zone?
The position of KOI-13 b relative to the habitable zone of KOI-13 cannot be precisely determined from the available orbital data.
Temperature on KOI-13 b
The equilibrium temperature of KOI-13 b is about 2,550 K (2,277 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C.
Orbit and Year Length
A year on KOI-13 b — one full orbit around KOI-13 — lasts just 42.3 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.036 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.001).
How Was KOI-13 b Discovered?
KOI-13 b was discovered in 2011 using the transit method, with observations from Kepler.
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 KOI-13 b?
KOI-13 b is 1,693.1 light-years (519.1 parsecs) from Earth. Light arriving here tonight left the planet about 1,693 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 29,798,560 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. KOI-13 b scores 0.05, ranking #5,238 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: KOI-13
KOI-13 b belongs to a system of 3 stars; it orbits KOI-13.
KOI-13
- Surface temperature
- 7,650 K (Sun: 5,772 K)
- Mass
- 1.72 M☉
- Radius
- 1.74 R☉
Planetary System
KOI-13 b is the only planet known to orbit KOI-13 so far.
KOI-13 b — Complete Data
| Radius | 16.948 Earth radii (1.512 Jupiter radii) |
|---|---|
| Mass | 2,949.46 Earth masses (9.280 Jupiter masses) |
| Density | 3.60 g/cm³ (Earth: 5.51) |
| Orbital period | 1.76 days |
| Orbital distance | 0.036 AU |
| Eccentricity | 0.001 |
| Equilibrium temperature | 2,550 K (2,277 °C) |
| Earth Similarity Index | 0.05 |
| Distance from Earth | 1,693.1 light-years (519.1 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2011 |
Data: NASA Exoplanet Archive, last updated 2015-10-07. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About KOI-13 b
Is KOI-13 b habitable?
KOI-13 b is not known to orbit within the habitable zone of KOI-13, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is KOI-13 b?
KOI-13 b is about 1,693 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 29,798,560 years to get there.
How big is KOI-13 b compared to Earth?
KOI-13 b has 16.95 times the radius of Earth and about 2,949 times its mass.
How long is a year on KOI-13 b?
One orbit around KOI-13 takes 1.8 Earth days — short enough that 207 of its years would fit into one Earth year.
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