HIP 113103 c
HIP 113103 c is a mini-Neptune orbiting HIP 113103 in the constellation Grus. It lies about 151 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is HIP 113103 c?
HIP 113103 c has a radius of 2.40 times that of Earth.
Is HIP 113103 c in the Habitable Zone?
HIP 113103 c orbits inside the inner edge of the habitable zone of HIP 113103. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HIP 113103: 0.425–1.029 AU (conservative: 0.538–0.976 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HIP 113103 c
The equilibrium temperature of HIP 113103 c is about 585 K (312 °C) — hotter than anywhere on Earth. 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 HIP 113103 c — one full orbit around HIP 113103 — lasts 14.2 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.105 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.17).
How Was HIP 113103 c Discovered?
HIP 113103 c was discovered in 2023 using the transit method, with observations from Transiting Exoplanet Survey Satellite (TESS).
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 HIP 113103 c?
HIP 113103 c is 150.7 light-years (46.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1876. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,652,320 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. HIP 113103 c scores 0.29, ranking #2,028 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HIP 113103
HIP 113103
- Surface temperature
- 4,930 K (Sun: 5,772 K)
- Mass
- 0.76 M☉
- Radius
- 0.74 R☉
- Age
- 0.5 billion years (Sun: 4.6)
The HIP 113103 Planetary System
HIP 113103 c is one of 2 known planets in the HIP 113103 system. Its siblings:
- HIP 113103 b (Super Earth)
HIP 113103 c — Complete Data
| Radius | 2.400 Earth radii (0.214 Jupiter radii) |
|---|---|
| Orbital period | 14.25 days |
| Orbital distance | 0.105 AU |
| Eccentricity | 0.170 |
| Equilibrium temperature | 585 K (312 °C) |
| Earth Similarity Index | 0.29 |
| Distance from Earth | 150.7 light-years (46.2 parsecs) |
| Constellation | Grus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-09-19. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HIP 113103 c
Is HIP 113103 c habitable?
No — HIP 113103 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HIP 113103 c?
HIP 113103 c is about 151 light-years from Earth in the constellation Grus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,652,320 years to get there.
How big is HIP 113103 c compared to Earth?
HIP 113103 c has 2.40 times the radius of Earth.
How long is a year on HIP 113103 c?
One orbit around HIP 113103 takes 14.2 Earth days — short enough that 26 of its years would fit into one Earth year.
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