13point8All planet systems
2 known planets · 1,682 light years

NN Ser

NN Ser is a hot star (WD) 1,682 light years away, with 2 confirmed planets. Distances and orbital speeds are to scale; the star and planets are enlarged so you can see them.

Day 0
habitable zone (estimate)planet orbits

Green band: where liquid water could exist on a planet's surface. Drag to turn the system, pinch or scroll to zoom.

The star

The star

NN Ser

Type
WD
Surface
≈ 57,000 K
Mass
0.54 × the Sun

The planets

NN Ser

NN Ser d

Year
7.9 years
Distance from star
3.39 AU
Mass
2.3 Jupiters
Size
13 × Earth
Found
2010, eclipse timing variations (Multiple Observatories)
Outside the habitable zone
NN Ser

NN Ser c

Year
19.1 years
Distance from star
5.35 AU
Mass
7.3 Jupiters
Size
13 × Earth
Found
2010, eclipse timing variations (Multiple Observatories)
Outside the habitable zone

Masses found by the wobble method are minimums, because the orbit's tilt is unknown. Temperatures are equilibrium estimates for a bare planet, before any atmosphere.

How we know

Eclipse Timing Variations

Discovered by eclipse timing variations.

Sources

  1. Planet and star parameters: NASA Exoplanet Archive, Planetary Systems Composite Parameters, retrieved 1 Nov 2026. This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with NASA under the Exoplanet Exploration Program.
  2. Position: HYG Database v4.1 (CC BY-SA 4.0).
  3. Habitable zone: a simple estimate from the star's brightness (√L × 0.95 to 1.67 AU), shown as a guide.
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