Exoplanet · gas giant
HD 81688 b
HD 81688 b is a gas giant orbiting the star Intercrus. Its year lasts 184 Earth days. It was discovered in 2007 by the Radial Velocity method.
| Host star | Intercrus |
|---|---|
| Distance | 279.6 light-years (85.7 pc) |
| Orbital period | 184 days |
| Orbital radius | 0.648 AU |
| Eccentricity | 0.040 |
| Radius | 13.5 R⊕ · 1.2 R♃ |
| Mass (minimum) | 526 M⊕ · 1.65 M♃ |
| Density | 1.17 g/cm³ |
| Equilibrium temperature | 959 K (686 °C) |
| Stellar flux received | 144 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2007 |
| Discovered by | Okayama Astrophysical Observatory |
Habitable zone
Inside the inner edge of the habitable zone: it receives 144 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 9.1° across: 17 times the Sun as we see it from Earth.
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.40). Visible from the whole Northern Hemisphere and south to latitude 44° S. North of latitude 44° N it never sets. It stands highest at midnight in February, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1746. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 5.0 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.