Kepler-730 c
Kepler-730 c is a lava world orbiting Kepler-730 in the constellation Lyra. It lies about 6,311 light-years from Earth and was discovered in 2018 using the transit method.
How Big Is Kepler-730 c?
Kepler-730 c has a radius of 1.57 times that of Earth.
Is Kepler-730 c in the Habitable Zone?
Kepler-730 c orbits inside the inner edge of the habitable zone of Kepler-730. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-730: 1.011–2.393 AU (conservative: 1.281–2.269 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-730 c
The equilibrium temperature of Kepler-730 c is about 1,607 K (1,334 °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 Kepler-730 c — one full orbit around Kepler-730 — lasts 2.85 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.040 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-730 c Discovered?
Kepler-730 c was discovered in 2018 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-730 c?
Kepler-730 c is 6,311.2 light-years (1,935.0 parsecs) from Earth. Light arriving here tonight left the planet about 6,311 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 111,077,120 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-730 c scores 0.28, ranking #2,356 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-730
Kepler-730
- Surface temperature
- 5,620 K (Sun: 5,772 K)
- Mass
- 1.05 M☉
- Radius
- 1.41 R☉
- Age
- 9.5 billion years (Sun: 4.6)
The Kepler-730 Planetary System
Kepler-730 c is one of 2 known planets in the Kepler-730 system. Its siblings:
- Kepler-730 b (Hot Jupiter)
Kepler-730 c — Complete Data
| Radius | 1.569 Earth radii (0.140 Jupiter radii) |
|---|---|
| Orbital period | 2.85 days |
| Orbital distance | 0.040 AU |
| Equilibrium temperature | 1,607 K (1,334 °C) |
| Earth Similarity Index | 0.28 |
| Distance from Earth | 6,311.2 light-years (1,935.0 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2018 |
Data: NASA Exoplanet Archive, last updated 2019-01-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-730 c
Is Kepler-730 c habitable?
No — Kepler-730 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-730 c?
Kepler-730 c is about 6,311 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 111,077,120 years to get there.
How big is Kepler-730 c compared to Earth?
Kepler-730 c has 1.57 times the radius of Earth.
How long is a year on Kepler-730 c?
One orbit around Kepler-730 takes 2.9 Earth days — short enough that 128 of its years would fit into one Earth year.
Explore Kepler-730 c in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
