KOI-4978 b
KOI-4978 b is a terrestrial planet orbiting the G star KOI-4978 in the constellation Lyra. It lies about 3,054 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is KOI-4978 b?
KOI-4978 b has a radius of 0.70 times that of Earth.
Is KOI-4978 b in the Habitable Zone?
The position of KOI-4978 b relative to the habitable zone of KOI-4978 cannot be precisely determined from the available orbital data.
Habitable zone of KOI-4978: 0.577–1.391 AU (conservative: 0.730–1.319 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 KOI-4978 b — one full orbit around KOI-4978 — lasts just 22.6 hours, shorter than Mercury's 88-day year.
How Was KOI-4978 b Discovered?
KOI-4978 b was discovered in 2024 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-4978 b?
KOI-4978 b is 3,053.9 light-years (936.3 parsecs) from Earth. Light arriving here tonight left the planet about 3,054 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 53,748,640 years to make the journey.
The Host Star: KOI-4978
KOI-4978
- Spectral type
- G
- Surface temperature
- 5,050 K (Sun: 5,772 K)
- Mass
- 0.86 M☉
- Radius
- 0.97 R☉
Planetary System
KOI-4978 b is the only planet known to orbit KOI-4978 so far.
KOI-4978 b — Complete Data
| Radius | 0.700 Earth radii (0.062 Jupiter radii) |
|---|---|
| Orbital period | 0.94 days |
| Distance from Earth | 3,053.9 light-years (936.3 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-10-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About KOI-4978 b
Is KOI-4978 b habitable?
KOI-4978 b is not known to orbit within the habitable zone of KOI-4978, and as a terrestrial planet it is an unlikely candidate for life as we know it.
How far away is KOI-4978 b?
KOI-4978 b is about 3,054 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 53,748,640 years to get there.
How big is KOI-4978 b compared to Earth?
KOI-4978 b has 0.70 times the radius of Earth.
How long is a year on KOI-4978 b?
One orbit around KOI-4978 takes 0.9 Earth days — short enough that 388 of its years would fit into one Earth year.
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