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2 known planets · 505.9 light years

HIP 8541

HIP 8541 is a giant star (K2 III/IV) 505.9 light years away, with 2 confirmed planets, 1 of them in the habitable zone. 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

HIP 8541

Type
K2 III/IV
Surface
≈ 4,672 K
Size
6.84 × the Sun
Mass
2.01 × the Sun
Brightness
20.4 × the Sun
Habitable zone
3.59–8.8 AU

The planets

HIP 8541

HD 11343 c

Year
228.54 days
Distance from star
0.923 AU
Mass
at least 2.6e+02 Earths
Size
14 × Earth
Temperature
≈ 613 K (+340 °C)
Found
2022, radial velocity (Multiple Observatories)
Too hot
HIP 8541

HIP 8541 b

Year
5.1 years
Distance from star
3.73 AU
Mass
7.7 Jupiters
Size
13 × Earth
Temperature
≈ 305 K (+32 °C)
Found
2016, radial velocity (Multiple Observatories)
In 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

The wobble

The planet tugs its star back and forth. Spectrographs measure the tiny shift in the star's light, which gives the planet's year and a minimum mass.

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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