The GJ 143 System
GJ 143 is a planetary system in the constellation Reticulum hosting 2 confirmed exoplanets, about 53 light-years from Earth.
Size Comparison: The Planets of GJ 143
GJ 143: Star and Habitable Zone
GJ 143
- Spectral type
- K4.5
- Surface temperature
- 4,640 K (Sun: 5,772 K)
- Mass
- 0.73 M☉
- Radius
- 0.70 R☉
- Luminosity
- 0.2060 L☉
- Age
- 3.8 billion years (Sun: 4.6)
Habitable zone of GJ 143: 0.361–0.886 AU (conservative: 0.457–0.840 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
All 2 Planets in the GJ 143 System
| Planet | Type | Orbit | Radius | ESI | Discovered |
|---|---|---|---|---|---|
| GJ 143 b | Super Earth | 36 d | 2.61 R⊕ | 0.41 | 2019 |
| HD 21749 c | Terrestrial | 7.8 d | 0.89 R⊕ | 0.32 | 2019 |
Discovery History
The first planet found here, GJ 143 b, was discovered in 2019 using the transit method.
- 2019 — GJ 143 b (Transit)
- 2019 — HD 21749 c (Transit)
Frequently Asked Questions About GJ 143
How many planets does GJ 143 have?
GJ 143 has 2 confirmed exoplanets. More may await discovery.
Are any planets in the GJ 143 system habitable?
None of the known planets in GJ 143 orbit within the star's habitable zone.
How far away is GJ 143?
GJ 143 is about 53 light-years from Earth in the constellation Reticulum.
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