The 55 Cnc system contains 5 exoplanets. It is located 41.05 light years away from the solar system.
| Mass | 0.91 solar masses |
| Radius | 0.94 solar radiae |
| Temperature | 5172 kelvin |
| Stellar Metallicity | 0.35 decimal exponent |
| Age | 5.5 billion years |
At more than 50 Earth masses, 55 Cnc b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 263.978 Earth masses |
| Density | 0.540 grams per cubic centimeter |
| Radius | 13.900 Earth radiae |
| Semi-major Axis | 0.1134 AU |
| Eccentricity | 0 |
| Orbital Period | 14.652 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | Lick Observatory |
| Discovery Telescope | 3.0 m C. Donald Shane Telescope |
| Discovery Instrument | Hamilton Echelle Spectrograph |
| Discovery Date | 1997-01 |
| Reference | Butler et al. 1997 |
At more than 50 Earth masses, 55 Cnc c is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 54.474 Earth masses |
| Density | 0.486 grams per cubic centimeter |
| Radius | 8.510 Earth radiae |
| Semi-major Axis | 0.2373 AU |
| Eccentricity | 0.03 |
| Orbital Period | 44.399 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | McDonald Observatory |
| Discovery Telescope | 9.2 m Hobby-Eberly Telescope |
| Discovery Instrument | High Resolution Spectrograph |
| Discovery Date | 2004-10 |
| Reference | McArthur et al. 2004 |
At more than 50 Earth masses, 55 Cnc d is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 1232.493 Earth masses |
| Density | 3.080 grams per cubic centimeter |
| Radius | 13.000 Earth radiae |
| Semi-major Axis | 5.957 AU |
| Eccentricity | 0.13 |
| Orbital Period | 5574.200 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | Lick Observatory |
| Discovery Telescope | 3.0 m C. Donald Shane Telescope |
| Discovery Instrument | Hamilton Echelle Spectrograph |
| Discovery Date | 2002-12 |
| Reference | Marcy et al. 2002 |
At more than 10 Earth masses, 55 Cnc e is an ice giant, a planet that is made up mostly of volatiles like water, amonia and methane, and enveloped by a dense hydrogen and helium atmosphere, much like Uranus and Neptune.
| Mass | 7.990 Earth masses |
| Density | 6.660 grams per cubic centimeter |
| Radius | 1.875 Earth radiae |
| Semi-major Axis | 0.01544 AU |
| Eccentricity | 0.05 |
| Orbital Period | 0.737 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | McDonald Observatory |
| Discovery Telescope | 9.2 m Hobby-Eberly Telescope |
| Discovery Instrument | High Resolution Spectrograph |
| Discovery Date | 2004-10 |
| Reference | McArthur et al. 2004 |
At more than 10 Earth masses, 55 Cnc f is an ice giant, a planet that is made up mostly of volatiles like water, amonia and methane, and enveloped by a dense hydrogen and helium atmosphere, much like Uranus and Neptune.
| Mass | 44.812 Earth masses |
| Density | 0.563 grams per cubic centimeter |
| Radius | 7.590 Earth radiae |
| Semi-major Axis | 0.7708 AU |
| Eccentricity | 0.08 |
| Orbital Period | 259.880 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | Multiple Observatories |
| Discovery Telescope | Multiple Telescopes |
| Discovery Instrument | Multiple Instruments |
| Discovery Date | 2008-03 |
| Reference | Fischer et al. 2008 |