The HD 156668 System
HD 156668 is a planetary system in the constellation Hercules hosting 2 confirmed exoplanets, about 79 light-years from Earth. One of its planets orbits within the habitable zone, where liquid water could exist on a planetary surface.
HD 156668: Star and Habitable Zone
HD 156668
- Surface temperature
- 4,850 K (Sun: 5,772 K)
- Mass
- 0.77 M☉
- Radius
- 0.72 R☉
- Luminosity
- 1.6982 L☉
- Age
- 8.6 billion years (Sun: 4.6)
Habitable zone of HD 156668: 1.028–2.500 AU (conservative: 1.302–2.370 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 156668 System
| Planet | Type | Orbit | Radius | ESI | Discovered |
|---|---|---|---|---|---|
| HD 156668 b | Super Earth | 4.6 d | — | 0.26 | 2010 |
| HD 156668 c HZ | Neptune-like | 811 d | — | 0.24 | 2021 |
Discovery History
The first planet found here, HD 156668 b, was discovered in 2010 using the radial velocity method. The most recent addition, HD 156668 c, followed in 2021.
- 2010 — HD 156668 b (Radial Velocity)
- 2021 — HD 156668 c (Radial Velocity)
Frequently Asked Questions About HD 156668
How many planets does HD 156668 have?
HD 156668 has 2 confirmed exoplanets. More may await discovery.
Are any planets in the HD 156668 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 156668?
HD 156668 is about 79 light-years from Earth in the constellation Hercules.
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