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Exoplanet Explorer

The TOI-178 System

6 planets Sculptor

TOI-178 is a planetary system in the constellation Sculptor hosting 6 confirmed exoplanets, about 205 light-years from Earth.

Size Comparison: The Planets of TOI-178

Earth1.00 R⊕b1.20 R⊕c1.75 R⊕d2.70 R⊕e2.30 R⊕f2.42 R⊕g2.94 R⊕
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TOI-178: Star and Habitable Zone

TOI-178

Surface temperature
4,316 K (Sun: 5,772 K)
Mass
0.65 M☉
Radius
0.66 R☉
Luminosity
0.1360 L☉
Age
6.0 billion years (Sun: 4.6)
Too hot Optimistic habitable zone Conservative habitable zone Too cold

Habitable zone of TOI-178: 0.297–0.739 AU (conservative: 0.376–0.701 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 6 Planets in the TOI-178 System

PlanetTypeOrbitRadiusESIDiscovered
TOI-178 bTerrestrial1.9 d1.20 R⊕0.302021
TOI-178 cSuper Earth3.2 d1.75 R⊕0.292021
TOI-178 dPuffy Planet6.6 d2.70 R⊕0.262021
TOI-178 eMini Neptune10.0 d2.30 R⊕0.302021
TOI-178 fMini Neptune15 d2.42 R⊕0.342021
TOI-178 gPuffy Planet21 d2.94 R⊕0.352021

Discovery History

The first planet found here, TOI-178 b, was discovered in 2021 using the transit method.

Frequently Asked Questions About TOI-178

How many planets does TOI-178 have?

TOI-178 has 6 confirmed exoplanets. More may await discovery.

Are any planets in the TOI-178 system habitable?

None of the known planets in TOI-178 orbit within the star's habitable zone.

How far away is TOI-178?

TOI-178 is about 205 light-years from Earth in the constellation Sculptor.

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