HD 187123 is 150 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this G3 V star; the first was found in 1998 by radial velocity (W. M. Keck Observatory).
Fly there in 3DHD 187123 b goes round its star every 3.10 days, 28 times as often as Mercury goes round the Sun.
| Spectral type | G3 V |
| Surface temperature | 5,790 K |
| Mass | 1.04 solar masses |
| Radius | 1.15043 solar radii |
| Luminosity | 1.34 times the Sun |
| Apparent magnitude | 7.83 |
| Age | about 7.4 billion years |
| Distance from the Sun | 149.9 light-years (46.0 parsecs) |
| Position (J2000) | RA 296.7429°, Dec 34.4190° |
| Constellation | Cygnus |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| HD 187123 b | 3.10 days | 0.0426 AU | 14.2 R⊕ estimated | 166.22 M⊕ minimum | Radial Velocity, 1998 |
| HD 187123 c | 10.4 years | 4.890 AU | 13.2 R⊕ estimated | 912.17 M⊕ | Radial Velocity, 2008 |
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.