HD 110113 c
HD 110113 c is a Neptune-like planet orbiting the G star HD 110113 in the constellation Centaurus. It lies about 347 light-years from Earth and was discovered in 2021 using the radial velocity method.
Is HD 110113 c in the Habitable Zone?
HD 110113 c orbits inside the inner edge of the habitable zone of HD 110113. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 110113: 0.717–1.691 AU (conservative: 0.908–1.603 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HD 110113 c
The equilibrium temperature of HD 110113 c is about 990 K (717 °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 200 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on HD 110113 c — one full orbit around HD 110113 — lasts 6.74 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.068 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.045).
How Was HD 110113 c Discovered?
HD 110113 c was discovered in 2021 using the radial velocity method, with observations from La Silla Observatory.
The radial velocity method measures the subtle wobble of a star caused by the gravitational pull of an orbiting planet, visible as periodic shifts in the star's light spectrum. The size of the wobble reveals the planet's minimum mass.
How Far Away Is HD 110113 c?
HD 110113 c is 346.7 light-years (106.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1680. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,101,920 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. HD 110113 c scores 0.26, ranking #2,984 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 110113
HD 110113
- Spectral type
- G
- Surface temperature
- 5,732 K (Sun: 5,772 K)
- Mass
- 1.00 M☉
- Radius
- 0.97 R☉
- Age
- 4.0 billion years (Sun: 4.6)
The HD 110113 Planetary System
HD 110113 c is one of 2 known planets in the HD 110113 system. Its siblings:
- HD 110113 b (Mini Neptune)
HD 110113 c — Complete Data
| Mass (best estimate) | 10.50 Earth masses |
|---|---|
| Orbital period | 6.74 days |
| Orbital distance | 0.068 AU |
| Eccentricity | 0.045 |
| Equilibrium temperature | 990 K (717 °C) |
| Stellar irradiation | 199.90× Earth |
| Earth Similarity Index | 0.26 |
| Distance from Earth | 346.7 light-years (106.3 parsecs) |
| Constellation | Centaurus |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-02-05. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 110113 c
Is HD 110113 c habitable?
No — HD 110113 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 110113 c?
HD 110113 c is about 347 light-years from Earth in the constellation Centaurus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,101,920 years to get there.
How long is a year on HD 110113 c?
One orbit around HD 110113 takes 6.7 Earth days — short enough that 54 of its years would fit into one Earth year.
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