GJ 900 A is 67.9 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this K7 star; the first was found in 2024 by imaging (Multiple Observatories).
Fly there in 3DGJ 900 b was photographed directly: it is one of the few exoplanets seen as its own point of light rather than inferred from its star.
GJ 900 A is one of 3 stars in its system. The position of the other 2 is not catalogued, so only GJ 900 A and its planets are drawn.
Where the archive gives only a period or only an orbit size, the other is worked out from Kepler’s third law with the star’s mass.
| Spectral type | K7 |
| Surface temperature | 3,976 K |
| Mass | 1.08 solar masses |
| Radius | 0.716187 solar radii |
| Luminosity | 0.1199 times the Sun |
| Apparent magnitude | 9.59 |
| Age | about 0.2 billion years |
| Distance from the Sun | 67.9 light-years (20.8 parsecs) |
| Position (J2000) | RA 353.7526°, Dec 1.6055° |
| Constellation | Pisces |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| GJ 900 b | 1264887.1 years from Kepler’s law | 12000.000 AU | 12.4 R⊕ estimated | 3496.1 M⊕ | Imaging, 2024 |
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 3,976 K, 0.12 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.36 to 0.68 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 68 years ago, within living memory.