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55 Cancri

The planetary system 55 Cancri hosts at least 5 planets. Note that the system is a multiple star system. It hosts at least 2 stellar components.

  System parameters
Primary system name 55 Cancri
Alternative system names 55 Cnc
Right ascension 08 52 35.81093
Declination +28 19 50.9511
Distance [parsec] 12.34±0.11edit
Distance [lightyears] 40.2±0.4
Number of stars in system 2
Number of planets in system 5

ArchitectureArchitecture of the system

This list shows all planetary and stellar components in the system. It gives a quick overview of the hierarchical architecture.

  •  Stellar binary
    •  55 Cancri A, stellar object
      •  55 Cnc b, planet, semi-major axis: 0.1152±0.0000 AU
        •  55 Cnc c, planet, semi-major axis: 0.2414±0.0000 AU
          •  55 Cnc d, planet, semi-major axis: 5.5±0.3 AU
            •  55 Cnc e, planet, semi-major axis: 0.0157±0.0000 AU
              •  55 Cnc f, planet, semi-major axis: 0.7880±0.0010 AU
              •  55 Cancri B, stellar object

              PlanetsPlanets in the system

              This table lists all planets in the system 55 Cancri.

                55 Cnc b 55 Cnc c 55 Cnc d 55 Cnc e 55 Cnc f
              Alternative planet names rho01 Cnc b, ρ1 Cnc b, HR 3522 b, 55 Cnc A b, rho01 Cnc A b, ρ1 Cnc A b rho01 Cnc c, ρ1 Cnc c, HR 3522 c, 55 Cnc A c, rho01 Cnc A c, ρ1 Cnc A c rho01 Cnc d, ρ1 Cnc d, HR 3522 d, 55 Cnc A d, rho01 Cnc A d, ρ1 Cnc A d rho01 Cnc e, ρ1 Cnc e, HR 3522 e, 55 Cnc A e, rho01 Cnc A e, ρ1 Cnc A e rho01 Cnc f, ρ1 Cnc f, HR 3522 f, 55 Cnc A f, rho01 Cnc A f, ρ1 Cnc A f
              Description 55 Cancri is a binary system in the constellation Cancer. 55 Cnc b and c are in a near 1:3 resonance. A dynamical analysis shows that the system has to be almost coplanar in order to be stable for the age the system.edit 55 Cancri is a binary system in the constellation Cancer. 55 Cnc b and c are in a near 1:3 resonance. A dynamical analysis shows that the system has to be almost coplanar in order to be stable for the age the system.edit 55 Cancri is a binary system in the constellation Cancer. 55 Cnc b and c are in a near 1:3 resonance. A dynamical analysis shows that the system has to be almost coplanar in order to be stable for the age the system.edit 55 Cancri e is a super-Earth which appears to exhibit extreme variations in brightness temperature. The cause of these variations is unknown but may be due to large-scale volcanic activity on the planet. The latest estimates of the planetary radius are compatible with a rocky composition, but a thick water envelope or a carbon-rich composition cannot be ruled out.edit 55 Cancri is a binary system in the constellation Cancer. 55 Cnc b and c are in a near 1:3 resonance. A dynamical analysis shows that the system has to be almost coplanar in order to be stable for the age the system.edit
              Lists Confirmed planets; Planets in binary systems, S-type
              Mass [Mjup] 0.831±0.003edit 0.171±0.005edit 3.88±0.07edit 0.0254±0.0010edit 0.141±0.012edit
              Mass [Mearth] 264.0±1.0 54.5±1.7 1233±22 8.1±0.3 45±4
              Radius [Rjup] N/A N/A N/A 0.175±0.007edit N/A
              Radius [Rearth] N/A N/A N/A 1.92±0.08 N/A
              Orbital period [days] 14.6515±0.0001edit 44.4175±0.0001edit 4825±39edit 0.7366±0.0000edit 262.0±0.5edit
              Semi-major axis [AU] 0.1152±0.0000edit 0.2414±0.0000edit 5.5±0.3edit 0.0157±0.0000edit 0.7880±0.0010edit
              Eccentricity 0.003±0.003edit 0.02±0.03edit 0.019±0.013edit 0.04±0.03edit 0.30±0.07edit
              Equilibrium temperature [K] N/A N/A N/A > 1328.0000edit N/A
              Discovery method RV RV RV transit RV
              Discovery year 1996 2002 2002 2004 2007
              Last updated [yy/mm/dd] 15/01/26 15/01/26 15/01/26 15/06/08 11/06/07

              starStars in the system

              This table lists all stars in the system 55 Cancri.

                55 Cancri A 55 Cancri B
              Alternative star names 55 Cnc A, rho01 Cnc A, Rho-1 Cancri A, ρ1 Cnc A, ρ1 Cancri A, HD 75732, HIP 43587, TYC 1949-2012-1, SAO 80478, HR 3522, Gliese 324 A, GJ 324 A, BD+28 1660 A, 2MASS J08523579+2819509, WDS J08526+2820 A, LDS 6219 A 55 Cnc b, rho01 Cnc B, Rho-1 Cancri B, ρ1 Cnc B, ρ1 Cancri B, Gliese 324 B, GJ 324 B, BD+28 1660 B, 2MASS J08524084+2818589, WDS J08526+2820 B, LDS 6219 B
              Mass [MSun] 0.96±0.07edit 0.200edit
              Radius [RSun] 0.960±0.018edit N/A
              Age [Gyr] N/A N/A
              Metallicity [Fe/H] 0.30±0.10edit N/A
              Temperature [K] 5219±26edit N/A
              Spectral type K0V M4
              Visual magnitude 5.95±0.05edit 13.00edit

              Planet sizes

              The following plot shows the approximate sizes of the planets in this system The Solar System planets are shown as a comparison. Note that unless the radius has been determined through a transit observation, this is only an approximation (see Lissauer et al. 2011b).

              PlutoMercuryMarsVenusEarthNeptuneUranusSaturnJupiter55 Cnc b55 Cnc c55 Cnc d55 Cnc e55 Cnc f

              Habitable zone

              The following plot shows the approximate location of the planets in this system with respect to the habitable zone (green) and the size of the star (red). This is only an estimate, using the star's spectral type and mass. Note that if no green band is shown in the plot, then the planet's orbit is far outside the habitable zone. The equations of Selsis, Kasting et al are used to draw the inner and outer boundaries.

              Habitable zone55 Cnc b55 Cnc c55 Cnc d55 Cnc e55 Cnc f

              referencesScientific references and contributors

              Links to scientific papers and other data sources

              history http://cdsbib.u-strasbg.fr/cgi-bin/cdsbib?2003yCat.2246....0C
              history http://dx.doi.org/10.1086/525512
              history http://arxiv.org/abs/1511.03197
              history http://arxiv.org/abs/1505.00269
              history http://exoplanetarchive.ipac.caltech.edu/cgi-bin/ExoTables/nph-exotbls?dataset=planets
              history http://phl.upr.edu/projects/habitable-exoplanets-catalog/data/database
              history http://cdsbib.u-strasbg.fr/cgi-bin/cdsbib?2009ApJ...694.1085V
              history http://arxiv.org/abs/1302.3321
              history http://adsabs.harvard.edu/abs/2015MNRAS.446.1493B

              This table lists all links which are relevant to this particular system. Note that this is just a summary. More references to the scientific publications and comments can be found in the commit messages. To see these, head over the github or click here to directly go to the git blame output of this system. In the left column of the output you can see the commit message corresponding to each parameter. It also lists the date of the last commit and the person making the changes. Within the commit message, you will find a link to the scientific publication where the data is taken from. Note that this is a new feature and not all system parameters might have a reference associated with it yet. Please help making this catalogue better and contribute data or references!

              Open Exoplanet Catalogue contributors

              Contributor E-mail Number of commits
              Andrew Tribick ajtribick(at)googlemail.com 5
              Hanno Rein hanno(at)hanno-rein.de 3
              Marc-Antoine Martinod marc-antoine.martinod(at)ens-cachan.fr 4
              Ryan Varley ryanjvarley(at)gmail.com 5

              This table lists all people who have contributed to the Open Exoplanet Catalogue. Please consider contributing! Click here to find out how. You can also view all commits contributing to this file on github.

              xmlData download

              You can download the xml file corresponding to this planetary system, which is part of the Open Exoplanet Catalogue. All information on this page has been directly generated from this XML file. You can also download the entire catalogue over at github. If you prefer to download the dataset as an ASCII tables, you might find the oec_tables repository usefule.

              correctionsCorrections

              If you spot an error or if you can contribute additional data to this entry, please send an e-mail to exoplanet@hanno-rein.de. Please include the corrected xml file and a reference to where the new data is coming from, ideally a scientific paper. If you are fluent with git and github, you can also create a pull request or open an issue on the Open Exoplanet Catalogue repository. Please include the reference to the relevant scientific paper in your commit message.