13point8All planet systems
2 known planets · 103.6 light years

HD 12235

HD 12235 is a yellow star 103.6 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

HD 12235

Type
yellow star
Surface
≈ 5,986 K
Size
1.80 × the Sun
Mass
1.10 × the Sun
Brightness
3.76 × the Sun
Habitable zone
1.44–3.37 AU

The planets

HD 12235

HD 12235 b

Year
4.36 days
Distance from star
0.054 AU
Mass
at least 10 Earths
Size
3.2 × Earth
Temperature
≈ 1667 K (+1394 °C)
Found
2022, radial velocity (Multiple Observatories)
Too hot
HD 12235

HD 12235 c

Year
99.5 years
Distance from star
22.2 AU
Mass
9.9 Jupiters
Size
12 × Earth
Temperature
≈ 82 K (-191 °C)
Found
2022, radial velocity (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

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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