HD 213885 b
HD 213885 b is a lava world 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 transit method.
How Big Is HD 213885 b?
HD 213885 b has a radius of 1.75 times that of Earth. Its mass is 8.8 times that of Earth, giving it a density of 9.15 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is HD 213885 b in the Habitable Zone?
HD 213885 b 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 b
The equilibrium temperature of HD 213885 b is about 2,128 K (1,855 °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 b — one full orbit around HD 213885 — lasts just 24.2 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.020 AU — closer to its star than Mercury is to the Sun.
How Was HD 213885 b Discovered?
HD 213885 b was discovered in 2019 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 213885 b?
HD 213885 b 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 b scores 0.27, ranking #2,680 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 b is one of 2 known planets in the HD 213885 system. Its siblings:
- HD 213885 c (Neptune-like)
HD 213885 b — Complete Data
| Radius | 1.745 Earth radii (0.156 Jupiter radii) |
|---|---|
| Mass | 8.83 Earth masses (0.028 Jupiter masses) |
| Density | 9.15 g/cm³ (Earth: 5.51) |
| Orbital period | 1.01 days |
| Orbital distance | 0.020 AU |
| Equilibrium temperature | 2,128 K (1,855 °C) |
| Earth Similarity Index | 0.27 |
| Distance from Earth | 156.8 light-years (48.1 parsecs) |
| Constellation | Tucana |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2019 |
Data: NASA Exoplanet Archive, last updated 2019-12-02. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 213885 b
Is HD 213885 b habitable?
No — HD 213885 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 213885 b?
HD 213885 b 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 big is HD 213885 b compared to Earth?
HD 213885 b has 1.75 times the radius of Earth and about 8.8 times its mass.
How long is a year on HD 213885 b?
One orbit around HD 213885 takes 1.0 Earth days — short enough that 362 of its years would fit into one Earth year.
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