HD 213885 c
HD 213885 c is a Neptune-like planet orbiting the G star HD 213885 in the constellation Tucana. It lies about 157 light-years from Earth and was discovered in 2019 using the radial velocity method.
Is HD 213885 c in the Habitable Zone?
HD 213885 c orbits inside the inner edge of the habitable zone of HD 213885. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 213885: 0.870–2.039 AU (conservative: 1.102–1.933 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on HD 213885 c
The equilibrium temperature of HD 213885 c is about 1,265 K (992 °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 HD 213885 c — one full orbit around HD 213885 — lasts 4.79 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.057 AU — closer to its star than Mercury is to the Sun.
How Was HD 213885 c Discovered?
HD 213885 c was discovered in 2019 using the radial velocity method, with observations from Multiple Observatories.
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 213885 c?
HD 213885 c is 156.8 light-years (48.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1870. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,759,680 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 213885 c scores 0.16, ranking #4,152 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 213885
HD 213885
- Spectral type
- G
- Surface temperature
- 5,978 K (Sun: 5,772 K)
- Mass
- 1.07 M☉
- Radius
- 1.10 R☉
- Luminosity
- 1.3760 L☉
- Age
- 3.8 billion years (Sun: 4.6)
The HD 213885 Planetary System
HD 213885 c is one of 2 known planets in the HD 213885 system. Its siblings:
- HD 213885 b (Lava World)
HD 213885 c — Complete Data
| Mass (best estimate) | 19.95 Earth masses |
|---|---|
| Orbital period | 4.79 days |
| Orbital distance | 0.057 AU |
| Equilibrium temperature | 1,265 K (992 °C) |
| Earth Similarity Index | 0.16 |
| Distance from Earth | 156.8 light-years (48.1 parsecs) |
| Constellation | Tucana |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2019 |
Data: NASA Exoplanet Archive, last updated 2019-12-02. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 213885 c
Is HD 213885 c habitable?
No — HD 213885 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 213885 c?
HD 213885 c is about 157 light-years from Earth in the constellation Tucana. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,759,680 years to get there.
How long is a year on HD 213885 c?
One orbit around HD 213885 takes 4.8 Earth days — short enough that 76 of its years would fit into one Earth year.
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