13point8100 ly map
2 known planets · 35.9 light years

GJ 1148

GJ 1148 is a red dwarf (M5) 35.9 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

GJ 1148

Type
M5
Surface
≈ 3,287 K
Size
0.36 × the Sun
Mass
0.34 × the Sun
Brightness
0.0135 × the Sun
Habitable zone
0.11–0.194 AU

The planets

GJ 1148

GJ 1148 b

Year
41.38 days
Distance from star
0.166 AU
Mass
at least 97 Earths
Size
12 × Earth
Temperature
≈ 233 K (-40 °C)
Found
2010, radial velocity (W. M. Keck Observatory)
In the habitable zone
GJ 1148

GJ 1148 c

Year
532.58 days
Distance from star
0.912 AU
Mass
at least 68 Earths
Size
9.7 × Earth
Temperature
≈ 99 K (-174 °C)
Found
2017, radial velocity (Calar Alto Observatory)
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 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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