Exoplanet · gas giant
HD 2039 b
HD 2039 b is a gas giant orbiting the star HD 2039. Its year lasts 1,120 Earth days. It was discovered in 2002 by the Radial Velocity method.
| Host star | HD 2039 |
|---|---|
| Distance | 279.5 light-years (85.7 pc) |
| Orbital period | 3.07 years |
| Orbital radius | 2.2 AU |
| Eccentricity | 0.710 |
| Radius | 12.7 R⊕ · 1.13 R♃ |
| Mass (minimum) | 2,000 M⊕ · 6.29 M♃ |
| Density | 5.36 g/cm³ |
| Equilibrium temperature | 211 K (-62 °C) |
| Stellar flux received | 0.323 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2002 |
| Discovered by | Anglo-Australian Telescope |
Habitable zone
At the edge of the habitable zone (within the optimistic limits): liquid water would be possible only with a favourable atmosphere.
Its star in the sky
In the planet's sky its star is a disc 0.29° across: 0.54 times the Sun as we see it from Earth.
In the sky
Too faint for the naked eye (magnitude 9.00); binoculars will find it. Visible from the whole Southern Hemisphere and north to latitude 33° N. South of latitude 33° S it never sets. It stands highest at midnight in September, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1747. 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.