13point8100 ly map
1 known planet · 69.1 light years

RR Cae

RR Cae is a orange dwarf (M) 69.1 light years away, with 1 confirmed planet. 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

RR Cae

Type
M
Surface
≈ 3,904 K
Size
0.19 × the Sun
Mass
0.44 × the Sun
Brightness
0.00781 × the Sun
Habitable zone
0.0718–0.183 AU

The planets

RR Cae

RR Cae b

Year
11.9 years
Distance from star
5.3 AU
Mass
at least 4.2 Jupiters
Size
13 × Earth
Temperature
≈ 36 K (-237 °C)
Found
2012, eclipse timing variations (Leoncito Astronomical Complex)
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 31 Oct 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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