Kepler-290 d
Kepler-290 d is a lava world orbiting Kepler-290 in the constellation Lyra. It lies about 2,266 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is Kepler-290 d?
Kepler-290 d has a radius of 0.86 times that of Earth.
Is Kepler-290 d in the Habitable Zone?
Kepler-290 d orbits inside the inner edge of the habitable zone of Kepler-290. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-290: 0.458–1.102 AU (conservative: 0.581–1.045 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on Kepler-290 d
The equilibrium temperature of Kepler-290 d is about 1,589 K (1,316 °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 1,504 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on Kepler-290 d — one full orbit around Kepler-290 — lasts just 18.3 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.015 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-290 d Discovered?
Kepler-290 d 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.
How Far Away Is Kepler-290 d?
Kepler-290 d is 2,265.6 light-years (694.6 parsecs) from Earth. Light arriving here tonight left the planet about 2,266 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 39,874,560 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. Kepler-290 d scores 0.29, ranking #1,728 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-290
Kepler-290
- Surface temperature
- 5,147 K (Sun: 5,772 K)
- Radius
- 0.74 R☉
The Kepler-290 Planetary System
Kepler-290 d is one of 3 known planets in the Kepler-290 system. Its siblings:
- Kepler-290 b (Mini Neptune)
- Kepler-290 c (Mini Neptune)
Kepler-290 d — Complete Data
| Radius | 0.860 Earth radii (0.077 Jupiter radii) |
|---|---|
| Orbital period | 0.76 days |
| Orbital distance | 0.015 AU |
| Equilibrium temperature | 1,589 K (1,316 °C) |
| Stellar irradiation | 1,503.79× Earth |
| Earth Similarity Index | 0.29 |
| Distance from Earth | 2,265.6 light-years (694.6 parsecs) |
| 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-290 d
Is Kepler-290 d habitable?
No — Kepler-290 d orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-290 d?
Kepler-290 d is about 2,266 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 39,874,560 years to get there.
How big is Kepler-290 d compared to Earth?
Kepler-290 d has 0.86 times the radius of Earth.
How long is a year on Kepler-290 d?
One orbit around Kepler-290 takes 0.8 Earth days — short enough that 478 of its years would fit into one Earth year.
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