The GJ 1148 System

2 planets 1 in habitable zone Ursa Major

GJ 1148 is a planetary system in the constellation Ursa Major hosting 2 confirmed exoplanets, about 36 light-years from Earth. One of its planets orbits within the habitable zone, where liquid water could exist on a planetary surface.

GJ 1148: Star and Habitable Zone

GJ 1148

Surface temperature: 3,287 K (Sun: 5,772 K)
Mass: 0.34 M☉
Radius: 0.36 R☉
Luminosity: 0.0135 L☉

GJ 1148 b GJ 1148 c →

Too hot Optimistic habitable zone Conservative habitable zone Too cold

Habitable zone of GJ 1148: 0.095–0.250 AU (conservative: 0.121–0.237 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.

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All 2 Planets in the GJ 1148 System

Planet	Type	Orbit	Radius	ESI	Discovered
GJ 1148 b HZ	Cold Gas Giant	41 d	—	0.36	2010
GJ 1148 c	Cold Gas Giant	533 d	—	0.11	2017

Discovery History

The first planet found here, GJ 1148 b, was discovered in 2010 using the radial velocity method. The most recent addition, GJ 1148 c, followed in 2017.

2010 — GJ 1148 b (Radial Velocity)
2017 — GJ 1148 c (Radial Velocity)

Frequently Asked Questions About GJ 1148

How many planets does GJ 1148 have?

GJ 1148 has 2 confirmed exoplanets. More may await discovery.

Are any planets in the GJ 1148 system habitable?

One planet in the system orbits within the habitable zone, where liquid water could exist. Actual habitability depends on atmospheres and composition, which are not yet known.

How far away is GJ 1148?

GJ 1148 is about 36 light-years from Earth in the constellation Ursa Major.

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