HD 17156 is 255 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this G5 star; the first was found in 2007 by radial velocity (Subaru Telescope).
Fly there in 3DHD 17156 b goes round its star every 21.2 days, 4 times as often as Mercury goes round the Sun.
| Spectral type | G5 |
| Surface temperature | 6,046 K |
| Mass | 1.285 solar masses |
| Radius | 1.517 solar radii |
| Luminosity | 2.76 times the Sun |
| Apparent magnitude | 8.17 |
| Age | about 3.3 billion years |
| Distance from the Sun | 254.7 light-years (78.1 parsecs) |
| Position (J2000) | RA 42.4366°, Dec 71.7531° |
| Constellation | Cassiopeia |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| HD 17156 b | 21.2 days | 0.163 AU | 12.263 R⊕ | 1036.1 M⊕ | Radial Velocity, 2007 |
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.