TOI-261 is 373 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this 5,890 K star; the first was found in 2021 by transit (Transiting Exoplanet Survey Satellite (TESS)).
Fly there in 3DTOI-261.01 goes round its star every 3.36 days, 26 times as often as Mercury goes round the Sun.
Where the archive gives only a period or only an orbit size, the other is worked out from Kepler’s third law with the star’s mass.
| Surface temperature | 5,890 K |
| Mass | 0.496728 solar masses |
| Radius | 1.28018 solar radii |
| Luminosity | 1.777 times the Sun |
| Apparent magnitude | 9.56 |
| Distance from the Sun | 373.4 light-years (114.5 parsecs) |
| Position (J2000) | RA 15.2181°, Dec -24.4240° |
| Constellation | Cetus |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| TOI-261.02 | 13.0 days | 0.0859 AU from Kepler’s law | 3.3482 R⊕ | 11.2 M⊕ estimated | Transit, 2021 |
| TOI-261.01 | 3.36 days | 0.0348 AU | 3.045 R⊕ | 9.51 M⊕ estimated | Transit, 2021 |
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.