Exoplanet · gas giant
HIP 99770 b
HIP 99770 b is a gas giant orbiting the star HIP 99770. Its year lasts 18,600 Earth days. It was discovered in 2023 by the Imaging method.
| Host star | HIP 99770 |
|---|---|
| Distance | 130.7 light-years (40.1 pc) |
| Orbital period | 50.9 years |
| Orbital radius | 15.8 AU |
| Eccentricity | 0.310 |
| Radius | 12.2 R⊕ · 1.09 R♃ |
| Mass | 5,400 M⊕ · 17 M♃ |
| Density | 16.4 g/cm³ |
| Surface gravity | 36.3 × Earth |
| Equilibrium temperature | 135 K (-138 °C) |
| Stellar flux received | 0.0555 × Earth |
| Discovery method | Imaging |
| Discovery year | 2023 |
| Discovered by | Multiple Observatories |
Habitable zone
Beyond the habitable zone: it receives only %5.6 of the light the Earth does, a frozen world.
Its star in the sky
In the planet's sky its star is a disc 0.065° across: 0.12 times the Sun as we see it from Earth.
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.93). 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 July, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1895. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.3 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.