TOI-1243 is 141 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this M2.0 V star; the first was found in 2026 by transit (Transiting Exoplanet Survey Satellite (TESS)).
Fly there in 3DTOI-1243 b goes round its star every 4.66 days, 19 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.
| Spectral type | M2.0 V |
| Surface temperature | 3,515 K |
| Mass | 0.515 solar masses |
| Radius | 0.511 solar radii |
| Luminosity | 0.03585 times the Sun |
| Apparent magnitude | 13.427 |
| Distance from the Sun | 140.9 light-years (43.2 parsecs) |
| Position (J2000) | RA 135.7326°, Dec 71.6364° |
| Constellation | Ursa Major |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| TOI-1243 b | 4.66 days | 0.0438 AU from Kepler’s law | 2.33 R⊕ | 7.7 M⊕ | Transit, 2026 |
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.