KOI-984 b
KOI-984 b is a Neptune-like planet orbiting KOI-984 in the constellation Lyra. It lies about 824 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is KOI-984 b?
KOI-984 b has a radius of 4.30 times that of Earth.
Is KOI-984 b in the Habitable Zone?
KOI-984 b orbits inside the inner edge of the habitable zone of KOI-984. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of KOI-984: 0.530–1.267 AU (conservative: 0.671–1.202 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on KOI-984 b
The equilibrium temperature of KOI-984 b is about 1,022 K (749 °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-984 b — one full orbit around KOI-984 — lasts 4.29 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.050 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.12).
How Was KOI-984 b Discovered?
KOI-984 b was discovered in 2022 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-984 b?
KOI-984 b is 824.1 light-years (252.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1202. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 14,504,160 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-984 b scores 0.17, ranking #4,078 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: KOI-984
KOI-984
- Surface temperature
- 5,295 K (Sun: 5,772 K)
- Mass
- 0.93 M☉
- Radius
- 0.82 R☉
The KOI-984 Planetary System
KOI-984 b is one of 2 known planets in the KOI-984 system. Its siblings:
- KOI-984 c (Cold Gas Giant)
KOI-984 b — Complete Data
| Radius | 4.300 Earth radii (0.384 Jupiter radii) |
|---|---|
| Orbital period | 4.29 days |
| Orbital distance | 0.050 AU |
| Eccentricity | 0.120 |
| Equilibrium temperature | 1,022 K (749 °C) |
| Earth Similarity Index | 0.17 |
| Distance from Earth | 824.1 light-years (252.7 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2022-07-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About KOI-984 b
Is KOI-984 b habitable?
No — KOI-984 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is KOI-984 b?
KOI-984 b is about 824 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 14,504,160 years to get there.
How big is KOI-984 b compared to Earth?
KOI-984 b has 4.30 times the radius of Earth.
How long is a year on KOI-984 b?
One orbit around KOI-984 takes 4.3 Earth days — short enough that 85 of its years would fit into one Earth year.
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