Exoplanet · gas giant
47 UMa b
47 UMa b is a gas giant orbiting the star Chalawan. Its year lasts 1,080 Earth days. It was discovered in 1996 by the Radial Velocity method.
| Host star | Chalawan |
|---|---|
| Distance | 45.0 light-years (13.8 pc) |
| Orbital period | 2.95 years |
| Orbital radius | 2.1 AU |
| Eccentricity | 0.032 |
| Radius | 13.2 R⊕ · 1.18 R♃ |
| Mass (minimum) | 804 M⊕ · 2.53 M♃ |
| Density | 1.92 g/cm³ |
| Equilibrium temperature | 215 K (-58 °C) |
| Stellar flux received | 0.358 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 1996 |
| Discovered by | Lick Observatory |
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 0.31° across: 0.58 times the Sun as we see it from Earth.
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.03). Visible from the whole Northern Hemisphere and south to latitude 50° S. North of latitude 50° N it never sets. It stands highest at midnight in March, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1981. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 798 thousand years.
Planets in the same system
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.