The GJ 273 System

2 planets 1 in habitable zone Canis Minor

GJ 273 is a planetary system in the constellation Canis Minor hosting 2 confirmed exoplanets, about 19 light-years from Earth. One of its planets orbits within the habitable zone, where liquid water could exist on a planetary surface.

GJ 273: Star and Habitable Zone

GJ 273

Spectral type: M3.5
Surface temperature: 3,382 K (Sun: 5,772 K)
Mass: 0.29 M☉
Radius: 0.29 R☉
Luminosity: 0.0088 L☉

GJ 273 b GJ 273 c

Too hot Optimistic habitable zone Conservative habitable zone Too cold

Habitable zone of GJ 273: 0.077–0.201 AU (conservative: 0.097–0.190 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.

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All 2 Planets in the GJ 273 System

Planet	Type	Orbit	Radius	ESI	Discovered
GJ 273 b HZ	Super Earth	19 d	—	0.85	2017
GJ 273 c	Terrestrial	4.7 d	—	0.48	2017

Discovery History

The first planet found here, GJ 273 b, was discovered in 2017 using the radial velocity method.

2017 — GJ 273 b (Radial Velocity)
2017 — GJ 273 c (Radial Velocity)

Frequently Asked Questions About GJ 273

How many planets does GJ 273 have?

GJ 273 has 2 confirmed exoplanets. More may await discovery.

Are any planets in the GJ 273 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 273?

GJ 273 is about 19 light-years from Earth in the constellation Canis Minor.

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