GJ 15 A is 11.6 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this M1 star; the first was found in 2014 by radial velocity (W. M. Keck Observatory).
Fly there in 3DGJ 15 A b goes round its star every 11.4 days, 8 times as often as Mercury goes round the Sun.
GJ 15 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 | M1 |
| Surface temperature | 3,607 K |
| Mass | 0.38 solar masses |
| Radius | 0.38 solar radii |
| Luminosity | 0.02213 times the Sun |
| Apparent magnitude | 8.09 |
| Distance from the Sun | 11.6 light-years (3.6 parsecs) |
| Position (J2000) | RA 4.6127°, Dec 44.0247° |
| Constellation | Andromeda |
GJ 15 B is a M3.5V star of magnitude 11.36, with a computed orbit. In 2019 it was 34.1″ from GJ 15 A, at position angle 66° (Washington Double Star Catalog, 00184+4401 GRB 34 AB): 121 AU on the sky at this distance. The true distance can only be larger.
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| GJ 15 A b disputed | 11.4 days | 0.0720 AU | 1.55 R⊕ estimated | 3.03 M⊕ minimum | Radial Velocity, 2014 |
| GJ 15 A c | 20.8 years | 5.400 AU | 6.67 R⊕ estimated | 36 M⊕ minimum | Radial Velocity, 2018 |
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.