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6 known planets · 150.3 light years

HD 34445

HD 34445 is a yellow star (G0 V) 150.3 light years away, with 6 confirmed planets, 2 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

HD 34445

Type
G0 V
Surface
≈ 5,836 K
Size
1.38 × the Sun
Mass
1.07 × the Sun
Brightness
2.01 × the Sun
Habitable zone
1.06–2.49 AU

The planets

HD 34445

HD 34445 e

Year
49.17 days
Distance from star
0.269 AU
Mass
at least 17 Earths
Size
4.3 × Earth
Temperature
≈ 638 K (+365 °C)
Found
2017, radial velocity (Multiple Observatories)
Too hot
HD 34445

HD 34445 d

Year
117.87 days
Distance from star
0.482 AU
Mass
at least 31 Earths
Size
6.1 × Earth
Temperature
≈ 476 K (+203 °C)
Found
2017, radial velocity (Multiple Observatories)
Too hot
HD 34445

HD 34445 c

Year
214.67 days
Distance from star
0.718 AU
Mass
at least 54 Earths
Size
8.4 × Earth
Temperature
≈ 390 K (+117 °C)
Found
2017, radial velocity (Multiple Observatories)
Outside the habitable zone
HD 34445

HD 34445 f

Year
676.80 days
Distance from star
1.54 AU
Mass
at least 38 Earths
Size
6.9 × Earth
Temperature
≈ 266 K (-7 °C)
Found
2017, radial velocity (Multiple Observatories)
In the habitable zone
HD 34445

HD 34445 b

Year
2.9 years
Distance from star
2.07 AU
Mass
at least 2.6e+02 Earths
Size
14 × Earth
Temperature
≈ 231 K (-42 °C)
Found
2009, radial velocity (W. M. Keck Observatory)
In the habitable zone
HD 34445

HD 34445 g

Year
15.6 years
Distance from star
6.36 AU
Mass
at least 1.2e+02 Earths
Size
14 × Earth
Temperature
≈ 131 K (-142 °C)
Found
2017, 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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