13point8All planet systems
2 known planets · 4,015 light years

KOI-55

KOI-55 is a hot star (B) 4,015 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

KOI-55

Type
B
Surface
≈ 27,730 K
Size
0.20 × the Sun
Mass
0.50 × the Sun
Brightness
22.9 × the Sun
Habitable zone
4.55–7.99 AU

The planets

KOI-55

KOI-55 b

Year
0.24 days
Distance from star
0.006 AU
Mass
0.44 Earths
Size
0.76 × Earth
Temperature
≈ 7778 K (+7505 °C)
Found
2011, orbital brightness modulation (Kepler)
Too hot
KOI-55

KOI-55 c

Year
0.34 days
Distance from star
0.0076 AU
Mass
0.66 Earths
Size
0.87 × Earth
Temperature
≈ 6911 K (+6638 °C)
Found
2011, orbital brightness modulation (Kepler)
Too hot

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

Orbital Brightness Modulation

Discovered by orbital brightness modulation.

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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