Kepler-1984 b
Kepler-1984 b is a hot Jupiter orbiting Kepler-1984 in the constellation Lyra. It was discovered in 2023 using the transit method.
How Big Is Kepler-1984 b?
Kepler-1984 b has a radius of 6.81 times that of Earth, or 0.61 times the radius of Jupiter.
Is Kepler-1984 b in the Habitable Zone?
Kepler-1984 b orbits inside the inner edge of the habitable zone of Kepler-1984. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-1984: 0.136–0.350 AU (conservative: 0.172–0.332 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 ›
Temperature on Kepler-1984 b
The equilibrium temperature of Kepler-1984 b is about 675 K (402 °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. It receives 48.82 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on Kepler-1984 b — one full orbit around Kepler-1984 — lasts just 47.8 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.024 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-1984 b Discovered?
Kepler-1984 b was discovered in 2023 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.
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. Kepler-1984 b scores 0.14, ranking #4,250 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-1984
Kepler-1984
- Surface temperature
- 3,638 K (Sun: 5,772 K)
- Mass
- 0.45 M☉
- Radius
- 0.42 R☉
Planetary System
Kepler-1984 b is the only planet known to orbit Kepler-1984 so far.
Kepler-1984 b — Complete Data
| Radius | 6.810 Earth radii (0.608 Jupiter radii) |
|---|---|
| Orbital period | 1.99 days |
| Orbital distance | 0.024 AU |
| Equilibrium temperature | 675 K (402 °C) |
| Stellar irradiation | 48.82× Earth |
| Earth Similarity Index | 0.14 |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2017-05-08. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-1984 b
Is Kepler-1984 b habitable?
No — Kepler-1984 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How big is Kepler-1984 b compared to Earth?
Kepler-1984 b has 6.81 times the radius of Earth.
How long is a year on Kepler-1984 b?
One orbit around Kepler-1984 takes 2.0 Earth days — short enough that 183 of its years would fit into one Earth year.
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