Exoplanet · mini-Neptune
GJ 27.1 b
GJ 27.1 b is a mini-Neptune orbiting the star GJ 27.1. Its year lasts 15.8 Earth days. It was discovered in 2014 by the Radial Velocity method.
| Host star | GJ 27.1 |
|---|---|
| Distance | 77.0 light-years (23.6 pc) |
| Orbital period | 15.8 days |
| Orbital radius | 0.101 AU |
| Eccentricity | 0.080 |
| Radius | 3.66 R⊕ · 0.327 R♃ |
| Mass (minimum) | 13 M⊕ · 0.0409 M♃ |
| Density | 1.46 g/cm³ |
| Equilibrium temperature | 387 K (114 °C) |
| Stellar flux received | 2.55 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2014 |
| Discovered by | Multiple Observatories |
Habitable zone
Inside the inner edge of the habitable zone: it receives 2.55 times the light the Earth does, too hot to keep liquid water on its surface.
Its star in the sky
In the planet's sky its star is a disc 2.7° across: 5.1 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 11.41. Visible from the whole Southern Hemisphere and north to latitude 46° N. South of latitude 46° S 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 1949. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.4 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.