The HD 216520 System
HD 216520 is a planetary system in the constellation Cepheus hosting 2 confirmed exoplanets, about 64 light-years from Earth. One of its planets orbits within the habitable zone, where liquid water could exist on a planetary surface.
HD 216520: Star and Habitable Zone
HD 216520
- Surface temperature
- 5,103 K (Sun: 5,772 K)
- Mass
- 0.82 M☉
- Radius
- 0.76 R☉
- Luminosity
- 0.3532 L☉
- Age
- 6.0 billion years (Sun: 4.6)
Habitable zone of HD 216520: 0.463–1.115 AU (conservative: 0.587–1.057 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
All 2 Planets in the HD 216520 System
| Planet | Type | Orbit | Radius | ESI | Discovered |
|---|---|---|---|---|---|
| HD 216520 b | Neptune-like | 35 d | — | 0.32 | 2020 |
| HD 216520 c HZ | Super Earth | 154 d | — | 0.63 | 2020 |
Discovery History
The first planet found here, HD 216520 b, was discovered in 2020 using the radial velocity method.
- 2020 — HD 216520 b (Radial Velocity)
- 2020 — HD 216520 c (Radial Velocity)
Frequently Asked Questions About HD 216520
How many planets does HD 216520 have?
HD 216520 has 2 confirmed exoplanets. More may await discovery.
Are any planets in the HD 216520 system habitable?
One planet in the system orbits within the habitable zone, where liquid water could exist. Actual habitability depends on atmospheres and composition, which are not yet known.
How far away is HD 216520?
HD 216520 is about 64 light-years from Earth in the constellation Cepheus.
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