13point8All planet systems
2 known planets · 626.9 light years

HU Aqr

HU Aqr is a yellow star 626.9 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

HU Aqr

Type
yellow star
Surface
≈ 5,952 K
Mass
0.88 × the Sun

The planets

HU Aqr

HU Aqr AB b

Year
6.5 years
Distance from star
3.6 AU
Mass
at least 5.9 Jupiters
Size
13 × Earth
Found
2011, eclipse timing variations (Yunnan Astronomical Observatory)
Outside the habitable zone
HU Aqr

HU Aqr AB c

Year
12.0 years
Distance from star
5.4 AU
Mass
at least 4.5 Jupiters
Size
13 × Earth
Found
2011, eclipse timing variations (Yunnan Astronomical Observatory)
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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