XO-2 S is 494 light-years from the Sun. The NASA Exoplanet Archive lists 3 planets around this G8 V star; the first was found in 2014 by radial velocity (Roque de los Muchachos Observatory).
Fly there in 3DXO-2 S b goes round its star every 18.2 days, 5 times as often as Mercury goes round the Sun.
XO-2 S 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 | G8 V |
| Surface temperature | 5,325 K |
| Mass | 0.98 solar masses |
| Radius | 1.02 solar radii |
| Luminosity | 0.7533 times the Sun |
| Apparent magnitude | 11.196 |
| Age | about 7.1 billion years |
| Distance from the Sun | 493.8 light-years (151.4 parsecs) |
| Position (J2000) | RA 117.0310°, Dec 50.2169° |
| Constellation | Lynx |
XO-2 S B is a G9V star of magnitude 11.25, judged a true companion. In 2016 it was 31.2″ from XO-2 S, at position angle 342° (Washington Double Star Catalog, 07481+5013 NI 17): 4,724 AU on the sky at this distance. The true distance can only be larger.
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| XO-2 S b | 18.2 days | 0.135 AU | 10.9 R⊕ estimated | 82.635 M⊕ minimum | Radial Velocity, 2014 |
| XO-2 S c | 120.1 days | 0.474 AU | 13.6 R⊕ estimated | 438.6 M⊕ minimum | Radial Velocity, 2014 |
| XO-2 S d | 12.9 years | 5.460 AU | 13 R⊕ estimated | 1179.1 M⊕ minimum | Radial Velocity, 2024 |
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.