TOI-4666 is 505 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this M2±0.5 star; the first was found in 2025 by transit (Transiting Exoplanet Survey Satellite (TESS)).
Fly there in 3DTOI-4666 b goes round its star every 2.91 days, 30 times as often as Mercury goes round the Sun.
| Spectral type | M2±0.5 |
| Surface temperature | 3,793 K |
| Mass | 0.576 solar masses |
| Radius | 0.585 solar radii |
| Luminosity | 0.0638 times the Sun |
| Apparent magnitude | 15.333 |
| Age | about 3 billion years |
| Distance from the Sun | 504.7 light-years (154.7 parsecs) |
| Position (J2000) | RA 56.2899°, Dec -39.0632° |
| Constellation | Eridanus |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| TOI-4666 b | 2.91 days | 0.0340 AU | 12.532 R⊕ | 155.42 M⊕ | Transit, 2025 |
Values are the NASA Exoplanet Archive’s composite parameters. A radius marked estimated comes from a mass–radius relation; a mass marked minimum is M sin i. Planet sizes and colours in the 3D view are renderings: none of these worlds has been photographed as more than a point of light.