HD 28109 is 455 light-years from the Sun. The NASA Exoplanet Archive lists 3 planets around this F8 star; the first was found in 2022 by transit (Transiting Exoplanet Survey Satellite (TESS)).
Fly there in 3DHD 28109 b goes round its star every 22.9 days, 4 times as often as Mercury goes round the Sun.
| Spectral type | F8 |
| Surface temperature | 6,189 K |
| Mass | 1.227 solar masses |
| Radius | 1.425 solar radii |
| Luminosity | 2.71 times the Sun |
| Apparent magnitude | 9.42 |
| Age | about 3.2 billion years |
| Distance from the Sun | 455.4 light-years (139.6 parsecs) |
| Position (J2000) | RA 65.2383°, Dec -68.1027° |
| Constellation | Hydrus |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| HD 28109 b | 22.9 days | 0.136 AU | 2.69 R⊕ | 6.2 M⊕ | Transit, 2022 |
| HD 28109 c | 56.0 days | 0.308 AU | 4.13 R⊕ | 9.2 M⊕ | Transit, 2022 |
| HD 28109 d | 84.3 days | 0.411 AU | 3.11 R⊕ | 5.8 M⊕ | Transit, 2022 |
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 6,189 K, 2.7 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 1.53 to 2.67 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 455 years ago, around 1570.