Kepler-297 d
Kepler-297 d is a cold gas giant orbiting Kepler-297 in the constellation Draco. It lies about 2,258 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is Kepler-297 d?
Kepler-297 d has a radius of 32.60 times that of Earth, or 2.91 times the radius of Jupiter.
Is Kepler-297 d in the Habitable Zone?
Kepler-297 d orbits inside the inner edge of the habitable zone of Kepler-297. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-297: 0.656–1.551 AU (conservative: 0.830–1.471 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on Kepler-297 d
The equilibrium temperature of Kepler-297 d is about 325 K (52 °C) — in a range broadly comparable to Earth, whose equilibrium temperature is 255 K. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 2.62 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on Kepler-297 d — one full orbit around Kepler-297 — lasts 150.0 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.523 AU — comparable to the inner Solar System.
How Was Kepler-297 d Discovered?
Kepler-297 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-297 d?
Kepler-297 d is 2,257.5 light-years (692.1 parsecs) from Earth. Light arriving here tonight left the planet about 2,258 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 39,732,000 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-297 d scores 0.25, ranking #3,111 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-297
Kepler-297
- Surface temperature
- 5,619 K (Sun: 5,772 K)
- Radius
- 0.92 R☉
The Kepler-297 Planetary System
Kepler-297 d is one of 3 known planets in the Kepler-297 system. Its siblings:
- Kepler-297 b (Mini Neptune)
- Kepler-297 c (Cold Gas Giant)
Kepler-297 d — Complete Data
| Radius | 32.600 Earth radii (2.908 Jupiter radii) |
|---|---|
| Orbital period | 150.02 days |
| Orbital distance | 0.523 AU |
| Equilibrium temperature | 325 K (52 °C) |
| Stellar irradiation | 2.62× Earth |
| Earth Similarity Index | 0.25 |
| Distance from Earth | 2,257.5 light-years (692.1 parsecs) |
| Constellation | Draco |
| 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-297 d
Is Kepler-297 d habitable?
No — Kepler-297 d orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-297 d?
Kepler-297 d is about 2,258 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 39,732,000 years to get there.
How big is Kepler-297 d compared to Earth?
Kepler-297 d has 32.60 times the radius of Earth.
How long is a year on Kepler-297 d?
One orbit around Kepler-297 takes 150.0 Earth days.
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