Exoplanet · Neptune-like planet
TOI-1439 b
TOI-1439 b is a Neptune-like planet orbiting the star TOI-1439. Its year lasts 27.6 Earth days. It was discovered in 2024 by the Transit method.
| Host star | TOI-1439 |
|---|---|
| Distance | 751.2 light-years (230.3 pc) |
| Orbital period | 27.6 days |
| Orbital radius | 0.192 AU |
| Eccentricity | 0.157 |
| Radius | 4.24 R⊕ · 0.379 R♃ |
| Mass | 38.5 M⊕ · 0.121 M♃ |
| Density | 2.76 g/cm³ |
| Surface gravity | 2.14 × Earth |
| Equilibrium temperature | 748 K (475 °C) |
| Stellar flux received | 68.4 × Earth |
| Discovery method | Transit |
| Discovery year | 2024 |
| Discovered by | Transiting Exoplanet Survey Satellite (TESS) |
Habitable zone
Inside the inner edge of the habitable zone: it receives 68.4 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 4.5° across: 8.4 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 10.63. Visible from the whole Northern Hemisphere and south to latitude 22° S. North of latitude 22° N it never sets. It stands highest at midnight in May, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1275. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 13 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.