WISEP J121756.91+162640.2 A is 32.9 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this T8.5 star; the first was found in 2012 by imaging (W. M. Keck Observatory).
Fly there in 3DWISEP J121756.91+162640.2 A b was photographed directly: it is one of the few exoplanets seen as its own point of light rather than inferred from its star.
Where the archive gives only a period or only an orbit size, the other is worked out from Kepler’s third law with the star’s mass.
| Spectral type | T8.5 |
| Surface temperature | 575 K |
| Mass | 0.029 solar masses |
| Radius | 0.091 solar radii |
| Luminosity | 8.128e-7 times the Sun |
| Age | about 6 billion years |
| Distance from the Sun | 32.9 light-years (10.1 parsecs) |
| Position (J2000) | RA 184.4871°, Dec 16.4445° |
| Constellation | Coma Berenices |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| WISEP J121756.91+162640.2 A b | 132.9 years from Kepler’s law | 8.000 AU | 10.468 R⊕ | 6992 M⊕ | Imaging, 2012 |
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.