HD 152843 c
HD 152843 c is a Neptune-like planet orbiting HD 152843 in the constellation Hercules. It lies about 352 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is HD 152843 c?
HD 152843 c has a radius of 5.94 times that of Earth, or 0.53 times the radius of Jupiter. Its mass is 9.7 times that of Earth, giving it a density of 0.25 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is HD 152843 c in the Habitable Zone?
HD 152843 c orbits inside the inner edge of the habitable zone of HD 152843. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 152843: 1.239–2.885 AU (conservative: 1.570–2.736 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HD 152843 c
HD 152843 c receives 133 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on HD 152843 c — one full orbit around HD 152843 — lasts 19.5 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.148 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.07).
How Was HD 152843 c Discovered?
HD 152843 c was discovered in 2021 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 HD 152843 c?
HD 152843 c is 351.9 light-years (107.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1675. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,193,440 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 152843 c scores 0.15, ranking #4,232 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 152843
HD 152843
- Surface temperature
- 6,310 K (Sun: 5,772 K)
- Mass
- 1.15 M☉
- Radius
- 1.43 R☉
- Age
- 4.0 billion years (Sun: 4.6)
The HD 152843 Planetary System
HD 152843 c is one of 2 known planets in the HD 152843 system. Its siblings:
- HD 152843 b (Sub Neptune)
HD 152843 c — Complete Data
| Radius | 5.940 Earth radii (0.530 Jupiter radii) |
|---|---|
| Mass | 9.67 Earth masses (0.030 Jupiter masses) |
| Density | 0.25 g/cm³ (Earth: 5.51) |
| Orbital period | 19.50 days |
| Orbital distance | 0.148 AU |
| Eccentricity | 0.074 |
| Stellar irradiation | 133.10× Earth |
| Earth Similarity Index | 0.15 |
| Distance from Earth | 351.9 light-years (107.9 parsecs) |
| Constellation | Hercules |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2025-11-20. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 152843 c
Is HD 152843 c habitable?
No — HD 152843 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 152843 c?
HD 152843 c is about 352 light-years from Earth in the constellation Hercules. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,193,440 years to get there.
How big is HD 152843 c compared to Earth?
HD 152843 c has 5.94 times the radius of Earth and about 9.7 times its mass.
How long is a year on HD 152843 c?
One orbit around HD 152843 takes 19.5 Earth days — short enough that 19 of its years would fit into one Earth year.
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