HD 189733 is 64.5 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this K2 V star; the first was found in 2005 by radial velocity (Haute-Provence Observatory).
Fly there in 3DHD 189733 b goes round its star every 2.22 days, 40 times as often as Mercury goes round the Sun.
HD 189733 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 | K2 V |
| Surface temperature | 5,052 K |
| Mass | 0.79 solar masses |
| Radius | 0.75 solar radii |
| Luminosity | 0.3458 times the Sun |
| Apparent magnitude | 7.67 |
| Age | about 1.4 billion years |
| Distance from the Sun | 64.5 light-years (19.8 parsecs) |
| Position (J2000) | RA 300.1821°, Dec 22.7098° |
| Constellation | Vulpecula |
HD 189733 B is a M4V star of magnitude 14.7, judged a true companion. In 2021 it was 11.3″ from HD 189733, at position angle 244° (Washington Double Star Catalog, 20007+2243 BAK 1 AB): 223 AU on the sky at this distance. The true distance can only be larger.
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| HD 189733 b | 2.22 days | 0.0313 AU | 12.666 R⊕ | 359.15 M⊕ | Radial Velocity, 2005 |
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.