TOI-663 is 209 light-years from the Sun. The NASA Exoplanet Archive lists 3 planets around this M1 V star; the first was found in 2024 by transit (Transiting Exoplanet Survey Satellite (TESS)).
Fly there in 3DTOI-663 b goes round its star every 2.60 days, 34 times as often as Mercury goes round the Sun.
| Spectral type | M1 V |
| Surface temperature | 3,681 K |
| Mass | 0.514 solar masses |
| Radius | 0.512 solar radii |
| Luminosity | 0.04263 times the Sun |
| Apparent magnitude | 13.667 |
| Distance from the Sun | 209.5 light-years (64.2 parsecs) |
| Position (J2000) | RA 160.0659°, Dec -8.5111° |
| Constellation | Sextans |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| TOI-663 b | 2.60 days | 0.0295 AU | 2.27 R⊕ | 4.45 M⊕ | Transit, 2024 |
| TOI-663 c | 4.70 days | 0.0437 AU | 2.26 R⊕ | 3.65 M⊕ | Transit, 2024 |
| TOI-663 d | 7.10 days | 0.0576 AU | 1.92 R⊕ | 5.2 M⊕ | Transit, 2024 |
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.
For a star of 3,681 K, 0.043 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.21 to 0.41 AU. None of its known planets orbits inside it. The zone says how much starlight arrives, not whether a planet has water or air. The edges follow Kopparapu et al. (2014), as the 3D view draws them.
The light you see left 209 years ago, around 1820.