NASA (Exoplanet Catalog artwork)TOI-6894 b
A giant planet around a star only a fifth the mass of the Sun — which shouldn't be possible
Overview
TOI-6894 b is a gas giant exoplanet that orbits a M-type star. Its mass is 0.168 Jupiters, it takes 3.4 days to complete one orbit of its star, and is 0.02604 AU from its star. Its discovery was announced in 2025.
Source: NASA Exoplanet Catalog
Why it matters
- Announced in 2025 as the lowest-mass star known to host a transiting giant planet.
- Saturn-sized but about half Saturn's mass; its star has just 20% of the Sun's mass.
- Core-accretion models say such small disks lack the material to build giants.
Discovery & system
- Discovered
- 2025 · Transit · Transiting Exoplanet Survey Satellite (TESS)
- Discovery paper
- Bryant et al. 2025
- Host star
- TOI-6894 · 3,007 K · 0.21 M☉
- System
- 1 known planet
The system
| World | Period | Distance | Radius | Mass | Temp. |
|---|---|---|---|---|---|
| TOI-6894 b | 3.37 d | 0.026 AU | 0.85 R♃ | 53.4 M⊕ | 418 K |
this worldhabitable zone 0.058 AU – 0.102 AUlog distance scaleorbital phases are arbitrarystar: type unknown, 3,007 K
By the numbers
- Radius
- 0.85 R♃9.6 R⊕
- Mass
- 53.4 M⊕318.89 ×10²⁴ kg
- Orbital period
- 3.37 d0.01 yr
- Distance from star
- 0.026 AU3.9 million km
- Eccentricity
- 0.029nearly circular
- Equilibrium temp.
- 418 K145 °C
- Starlight received
- 6 × Earth
- Distance from Earth
- 241 ly73.8 pc
- Density
- 0.33 g/cm³0.06 × Earth
Sources
Image: NASA (Exoplanet Catalog artwork) · NASA media: generally free of copyright · image page
Text: NASA Exoplanet Catalog. Taglines and highlights are editorial.