GJ 720 A is 50.7 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this M0.5 V star; the first was found in 2021 by radial velocity (Roque de los Muchachos Observatory).
Fly there in 3DGJ 720 A b goes round its star every 19.5 days, 5 times as often as Mercury goes round the Sun.
GJ 720 A is one of 2 stars in its system: the other is drawn where the Washington Double Star Catalog measures it on the sky.
| Spectral type | M0.5 V |
| Surface temperature | 3,837 K |
| Mass | 0.57 solar masses |
| Radius | 0.56 solar radii |
| Luminosity | 0.06067 times the Sun |
| Apparent magnitude | 9.84 |
| Distance from the Sun | 50.7 light-years (15.6 parsecs) |
| Position (J2000) | RA 278.8294°, Dec 45.7456° |
| Constellation | Lyra |
GJ 720 B is a M3 star of magnitude 12.4, judged a true companion. In 2016 it was 112.1″ from GJ 720 A, at position angle 56° (Washington Double Star Catalog, 18355+4546 LDS6329): 1,744 AU on the sky at this distance. The true distance can only be larger.
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| GJ 720 A b | 19.5 days | 0.119 AU | 3.77 R⊕ estimated | 13.64 M⊕ minimum | Radial Velocity, 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.
For a star of 3,837 K, 0.061 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.25 to 0.48 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 51 years ago, within living memory.