Exoplanet · mini-Neptune
HD 12235 b
HD 12235 b is a mini-Neptune orbiting the star HD 12235. Its year lasts 4.36 Earth days. It was discovered in 2022 by the Radial Velocity method.
| Host star | HD 12235 |
|---|---|
| Distance | 103.6 light-years (31.8 pc) |
| Orbital period | 4.36 days |
| Orbital radius | 0.054 AU |
| Eccentricity | 0.376 |
| Radius | 3.23 R⊕ · 0.288 R♃ |
| Mass (minimum) | 10.5 M⊕ · 0.033 M♃ |
| Density | 1.71 g/cm³ |
| Equilibrium temperature | 1,667 K (1,394 °C) |
| Stellar flux received | 1,290 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2022 |
| Discovered by | Multiple Observatories |
Habitable zone
Inside the inner edge of the habitable zone: it receives 1,290 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 18° across: 33 times the Sun as we see it from Earth.
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.89). Visible from the whole Northern Hemisphere and south to latitude 87° S. It stands highest at midnight in October, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1922. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.8 million years.
Planets in the same system
- HD 12235 c 36,300-day orbit · 12.5 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.