HD 180617 is 19.3 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this M2.5 V star; the first was found in 2018 by radial velocity (Calar Alto Observatory).
Fly there in 3DHD 180617 b takes 105.9 days to go round its star once.
HD 180617 is one of 2 stars in its system: the other is drawn where the Washington Double Star Catalog measures it on the sky.
| Spectral type | M2.5 V |
| Surface temperature | 3,534 K |
| Mass | 0.484 solar masses |
| Radius | 0.481 solar radii |
| Luminosity | 0.03236 times the Sun |
| Apparent magnitude | 9.12 |
| Distance from the Sun | 19.3 light-years (5.9 parsecs) |
| Position (J2000) | RA 289.2277°, Dec 5.1632° |
| Constellation | Aquila |
HD 180617 B is a M8V star of magnitude 17.43, judged a true companion. In 2016 it was 75.5″ from HD 180617, at position angle 153° (Washington Double Star Catalog, 19169+0510 LDS6334 AB): 446 AU on the sky at this distance. The true distance can only be larger.
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| HD 180617 b | 105.9 days | 0.343 AU | 3.53 R⊕ estimated | 12.214 M⊕ minimum | Radial Velocity, 2018 |
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.