HD 156668 is 79.4 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this K2 star; the first was found in 2010 by radial velocity (W. M. Keck Observatory).
Fly there in 3DHD 156668 b goes round its star every 4.65 days, 19 times as often as Mercury goes round the Sun.
| Spectral type | K2 |
| Surface temperature | 4,850 K |
| Mass | 0.772 solar masses |
| Radius | 0.72 solar radii |
| Luminosity | 1.698 times the Sun |
| Apparent magnitude | 8.43 |
| Age | about 8.6 billion years |
| Distance from the Sun | 79.4 light-years (24.3 parsecs) |
| Position (J2000) | RA 259.4183°, Dec 29.2282° |
| Constellation | Hercules |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| HD 156668 b | 4.65 days | 0.0500 AU | 1.87 R⊕ estimated | 4.15 M⊕ minimum | Radial Velocity, 2010 |
| HD 156668 c | 811.3 days | 1.570 AU | 6.17 R⊕ estimated | 31.497 M⊕ minimum | Radial Velocity, 2021 |
Values are the NASA Exoplanet Archive’s composite parameters. A radius marked estimated comes from a mass–radius relation; a mass marked minimum is M sin i. Planet sizes and colours in the 3D view are renderings: none of these worlds has been photographed as more than a point of light.