Exoplanet · gas giant
HD 202772 A b
HD 202772 A b is a gas giant orbiting the star HD 202772 A. Its year lasts 3.31 Earth days. It was discovered in 2019 by the Transit method.
| Host star | HD 202772 A |
|---|---|
| Distance | 526.7 light-years (161.5 pc) |
| Orbital period | 3.31 days |
| Orbital radius | 0.0521 AU |
| Eccentricity | 0.030 |
| Radius | 18.2 R⊕ · 1.63 R♃ |
| Mass | 324 M⊕ · 1.02 M♃ |
| Density | 0.293 g/cm³ |
| Surface gravity | 0.973 × Earth |
| Equilibrium temperature | 2,181 K (1,908 °C) |
| Stellar flux received | 3,770 × Earth |
| Discovery method | Transit |
| Discovery year | 2019 |
| Discovered by | Transiting Exoplanet Survey Satellite (TESS) |
Habitable zone
Inside the inner edge of the habitable zone: it receives 3,770 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 26° across: 48 times the Sun as we see it from Earth.
In the sky
Too faint for the naked eye (magnitude 8.39); binoculars will find it. Visible from the whole Southern Hemisphere and north to latitude 63° N. South of latitude 63° S it never sets. It stands highest at midnight in August, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1499. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 9.3 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.