HD 102329 is 708 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this K0 III star; the first was found in 2011 by radial velocity (W. M. Keck Observatory).
Fly there in 3DHD 102329 c takes 3.1 years to go round its star once.
Where the archive gives only a period or only an orbit size, the other is worked out from Kepler’s third law with the star’s mass.
| Spectral type | K0 III |
| Surface temperature | 4,745 K |
| Mass | 3.21 solar masses |
| Radius | 9.82 solar radii |
| Luminosity | 19.6 times the Sun |
| Apparent magnitude | 7.88 |
| Age | about 1.6 billion years |
| Distance from the Sun | 708.1 light-years (217.1 parsecs) |
| Position (J2000) | RA 176.6942°, Dec 3.4742° |
| Constellation | Virgo |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| HD 102329 c | 3.1 years | 3.119 AU from Kepler’s law | 13.5 R⊕ estimated | 483.1 M⊕ minimum | Radial Velocity, 2016 |
| HD 102329 b | 778.1 days | 1.810 AU | 12.6 R⊕ estimated | 2593.5 M⊕ minimum | Radial Velocity, 2011 |
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.
For a star of 4,745 K, 20 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 4.44 to 8.13 AU. None of its known planets orbits inside it. The zone says how much starlight arrives, not whether a planet has water or air. The edges follow Kopparapu et al. (2014), as the 3D view draws them.
The light you see left 708 years ago, around 1320.