Exoplanet · gas giant
HD 153557 d
HD 153557 d is a gas giant orbiting the star HD 153557. Its year lasts 40,700 Earth days. It was discovered in 2022 by the Radial Velocity method.
| Host star | HD 153557 |
|---|---|
| Distance | 58.5 light-years (17.9 pc) |
| Orbital period | 111 years |
| Orbital radius | 21.4 AU |
| Eccentricity | 0.152 |
| Radius | 11.9 R⊕ · 1.06 R♃ |
| Mass | 8,730 M⊕ · 27.5 M♃ |
| Density | 28.5 g/cm³ |
| Surface gravity | 61.6 × Earth |
| Equilibrium temperature | 43 K (-230 °C) |
| Stellar flux received | 6.00 × 10⁻⁴ × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2022 |
| Discovered by | Multiple Observatories |
Habitable zone
Beyond the habitable zone: it receives only %0.06 of the light the Earth does, a frozen world.
Its star in the sky
In the planet's sky its star is a disc 0.019° across: 0.035 times the Sun as we see it from Earth.
In the sky
Too faint for the naked eye (magnitude 7.76); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 43° S. North of latitude 43° N it never sets. It stands highest at midnight in June, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1967. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.0 million years.
Planets in the same system
- HD 153557 b 7.3-day orbit · 4.77 R⊕
- HD 153557 c 15.3-day orbit · 4.36 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.