HD 219666 is 307 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this G5 V star; the first was found in 2018 by transit (Transiting Exoplanet Survey Satellite (TESS)).
Fly there in 3DHD 219666 b goes round its star every 6.03 days, 15 times as often as Mercury goes round the Sun.
| Spectral type | G5 V |
| Surface temperature | 5,540 K |
| Mass | 1.02 solar masses |
| Radius | 1.059 solar radii |
| Luminosity | 0.938 times the Sun |
| Apparent magnitude | 9.809 |
| Age | about 10 billion years |
| Distance from the Sun | 307.1 light-years (94.2 parsecs) |
| Position (J2000) | RA 349.5593°, Dec -56.9040° |
| Constellation | Tucana |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| HD 219666 b | 6.03 days | 0.0636 AU | 4.898 R⊕ | 17.6 M⊕ | Transit, 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.
For a star of 5,540 K, 0.94 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.93 to 1.66 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 307 years ago, around 1720.