HIP 8152 b
HIP 8152 b is a mini-Neptune orbiting HIP 8152 in the constellation Cetus. It lies about 332 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is HIP 8152 b?
HIP 8152 b has a radius of 2.54 times that of Earth. Its mass is 8.9 times that of Earth, giving it a density of 2.97 g/cm³ — between that of rocky and gaseous planets.
Is HIP 8152 b in the Habitable Zone?
HIP 8152 b orbits inside the inner edge of the habitable zone of HIP 8152. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HIP 8152: 0.691–1.634 AU (conservative: 0.875–1.550 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HIP 8152 b
The equilibrium temperature of HIP 8152 b is about 795 K (522 °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 HIP 8152 b — one full orbit around HIP 8152 — lasts 10.8 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.093 AU — closer to its star than Mercury is to the Sun.
How Was HIP 8152 b Discovered?
HIP 8152 b 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 8152 b?
HIP 8152 b is 331.7 light-years (101.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1695. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 5,837,920 years to make the journey.
The Host Star: HIP 8152
HIP 8152
- Surface temperature
- 5,618 K (Sun: 5,772 K)
- Mass
- 0.94 M☉
- Radius
- 0.96 R☉
- Luminosity
- 0.8310 L☉
- Age
- 6.0 billion years (Sun: 4.6)
The HIP 8152 Planetary System
HIP 8152 b is one of 2 known planets in the HIP 8152 system. Its siblings:
- HIP 8152 c (Super Earth)
HIP 8152 b — Complete Data
| Radius | 2.536 Earth radii (0.226 Jupiter radii) |
|---|---|
| Mass | 8.90 Earth masses (0.028 Jupiter masses) |
| Density | 2.97 g/cm³ (Earth: 5.51) |
| Orbital period | 10.75 days |
| Orbital distance | 0.093 AU |
| Equilibrium temperature | 795 K (522 °C) |
| Distance from Earth | 331.7 light-years (101.7 parsecs) |
| Constellation | Cetus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2024-07-23. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HIP 8152 b
Is HIP 8152 b habitable?
No — HIP 8152 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HIP 8152 b?
HIP 8152 b is about 332 light-years from Earth in the constellation Cetus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 5,837,920 years to get there.
How big is HIP 8152 b compared to Earth?
HIP 8152 b has 2.54 times the radius of Earth and about 8.9 times its mass.
How long is a year on HIP 8152 b?
One orbit around HIP 8152 takes 10.8 Earth days — short enough that 34 of its years would fit into one Earth year.
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