55 Cnc is 41.0 light-years from the Sun. The NASA Exoplanet Archive lists 5 planets around this G8 V star; the first was found in 1996 by radial velocity (Lick Observatory).
Fly there in 3D55 Cnc e goes round its star every 17.7 hours, 119 times as often as Mercury goes round the Sun.
55 Cnc 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 | 5,198 K |
| Mass | 1.015 solar masses |
| Radius | 0.98 solar radii |
| Luminosity | 0.6354 times the Sun |
| Apparent magnitude | 5.95084 |
| Age | about 10 billion years |
| Distance from the Sun | 41.0 light-years (12.6 parsecs) |
| Position (J2000) | RA 133.1468°, Dec 28.3298° |
| Constellation | Cancer |
55 Cnc B is a M4V star of magnitude 13.15, judged a true companion. In 2016 it was 84.8″ from 55 Cnc, at position angle 128° (Washington Double Star Catalog, 08526+2820 LDS6219): 1,067 AU on the sky at this distance. The true distance can only be larger.
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| 55 Cnc e | 17.7 hours | 0.0154 AU | 1.875 R⊕ | 7.99 M⊕ | Radial Velocity, 2004 |
| 55 Cnc b | 14.7 days | 0.118 AU | 13.9 R⊕ estimated | 263.98 M⊕ | Radial Velocity, 1996 |
| 55 Cnc c | 44.4 days | 0.247 AU | 8.51 R⊕ estimated | 54.474 M⊕ | Radial Velocity, 2004 |
| 55 Cnc f | 260.6 days | 0.802 AU | 7.59 R⊕ estimated | 44.812 M⊕ | Radial Velocity, 2007 |
| 55 Cnc d | 13.1 years | 5.600 AU | 13 R⊕ estimated | 1232.5 M⊕ | Radial Velocity, 2002 |
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.