G 9-40 is 91.1 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this M2.5 V star; the first was found in 2019 by transit (K2).
Fly there in 3DG 9-40 b goes round its star every 5.75 days, 15 times as often as Mercury goes round the Sun.
| Spectral type | M2.5 V |
| Surface temperature | 3,395 K |
| Mass | 0.2952 solar masses |
| Radius | 0.3026 solar radii |
| Luminosity | 0.01096 times the Sun |
| Apparent magnitude | 13.821 |
| Age | about 9.9 billion years |
| Distance from the Sun | 91.1 light-years (27.9 parsecs) |
| Position (J2000) | RA 134.7189°, Dec 21.0748° |
| Constellation | Cancer |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| G 9-40 b | 5.75 days | 0.0418 AU | 1.9 R⊕ | 4 M⊕ | Transit, 2019 |
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.