HD 7924 is 55.4 light-years from the Sun. The NASA Exoplanet Archive lists 3 planets around this K0.5 V star; the first was found in 2008 by radial velocity (W. M. Keck Observatory).
Fly there in 3DHD 7924 b goes round its star every 5.40 days, 16 times as often as Mercury goes round the Sun.
| Spectral type | K0.5 V |
| Surface temperature | 5,131 K |
| Mass | 0.65 solar masses |
| Radius | 0.78 solar radii |
| Luminosity | 0.3923 times the Sun |
| Apparent magnitude | 7.17896 |
| Age | about 0.88 billion years |
| Distance from the Sun | 55.4 light-years (17.0 parsecs) |
| Position (J2000) | RA 20.4957°, Dec 76.7101° |
| Constellation | Cassiopeia |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| HD 7924 b | 5.40 days | 0.0600 AU | — | 2058.3 M⊕ | Radial Velocity, 2008 |
| HD 7924 c | 15.3 days | 0.113 AU | — | 1762.7 M⊕ | Radial Velocity, 2015 |
| HD 7924 d | 24.5 days | 0.155 AU | — | 1568.2 M⊕ | Radial Velocity, 2015 |
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 5,131 K, 0.39 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.62 to 1.11 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 55 years ago, within living memory.