Exoplanet · gas giant
NN Ser d
NN Ser d is a gas giant orbiting the star NN Ser. Its year lasts 2,880 Earth days. It was discovered in 2010 by the Eclipse Timing Variations method.
| Host star | NN Ser |
|---|---|
| Distance | 1,682 light-years (515.8 pc) |
| Orbital period | 7.89 years |
| Orbital radius | 3.39 AU |
| Eccentricity | 0.240 |
| Radius | 13.3 R⊕ · 1.19 R♃ |
| Mass | 725 M⊕ · 2.28 M♃ |
| Density | 1.69 g/cm³ |
| Surface gravity | 4.1 × Earth |
| Discovery method | Eclipse Timing Variations |
| Discovery year | 2010 |
| Discovered by | Multiple Observatories |
In the sky
A telescope is needed to see it: its apparent magnitude is 16.94. Visible from the whole Northern Hemisphere and south to latitude 77° S. North of latitude 77° N it never sets. It stands highest at midnight in May, the best time to observe it.
Light's journey
The light you see tonight set out around the year 344. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 30 million years.
Planets in the same system
- NN Ser c 6,990-day orbit · 12.6 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.