Exoplanet · mini-Neptune
GJ 1289 b
GJ 1289 b is a mini-Neptune orbiting the star GJ 1289. Its year lasts 112 Earth days. It was discovered in 2024 by the Radial Velocity method.
| Host star | GJ 1289 |
|---|---|
| Distance | 27.2 light-years (8.35 pc) |
| Orbital period | 112 days |
| Orbital radius | 0.27 AU |
| Eccentricity | 0.000 |
| Radius | 2.38 R⊕ · 0.212 R♃ |
| Mass (minimum) | 6.27 M⊕ · 0.0197 M♃ |
| Density | 2.56 g/cm³ |
| Equilibrium temperature | 150 K (-123 °C) |
| Stellar flux received | 0.0754 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2024 |
| Discovered by | Multiple Observatories |
Habitable zone
Beyond the habitable zone: it receives only %7.5 of the light the Earth does, a frozen world.
Its star in the sky
In the planet's sky its star is a disc 0.48° across: 0.91 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 12.57. Visible from the whole Northern Hemisphere and south to latitude 53° S. North of latitude 53° N it never sets. It stands highest at midnight in September, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1999. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 483 thousand years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.