HD 1397 is 260 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this G5 III/IV star; the first was found in 2018 by transit (Transiting Exoplanet Survey Satellite (TESS)).
Fly there in 3DHD 1397 b goes round its star every 11.5 days, 8 times as often as Mercury goes round the Sun.
| Spectral type | G5 III/IV |
| Surface temperature | 5,521 K |
| Mass | 1.324 solar masses |
| Radius | 2.336 solar radii |
| Luminosity | 4.57 times the Sun |
| Apparent magnitude | 7.79 |
| Age | about 4.51 billion years |
| Distance from the Sun | 259.5 light-years (79.6 parsecs) |
| Position (J2000) | RA 4.4472°, Dec -66.3589° |
| Constellation | Tucana |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| HD 1397 b | 11.5 days | 0.110 AU | 11.5 R⊕ | 131.9 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 5,521 K, 4.6 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 2.06 to 3.67 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 260 years ago, around 1770.