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Rho Coronae Borealis

The planetary system Rho Coronae Borealis hosts at least 2 planets.

  System parameters
Primary system name Rho Coronae Borealis
Alternative system names HD 143761
Right ascension 16 01 02.6608
Declination +33 18 12.6422
Distance [parsec] 17.24±0.08
Distance [lightyears] 56.2±0.3
Number of stars in system 1
Number of planets in system 2

ArchitectureArchitecture of the system

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

  •  Rho Coronae Borealis, stellar object
    •  Rho Coronae Borealis b, planet, semi-major axis: 0.220+0.002−0.003 AU
      •  Rho Coronae Borealis c, planet, semi-major axis: 0.412±0.005 AU

      PlanetsPlanets in the system

      This table lists all planets in the system Rho Coronae Borealis.

        Rho Coronae Borealis b Rho Coronae Borealis c
      Alternative planet names rho CrB b, ρ CrB b, HD 143761 b, Gaia DR2 1323427759184545536 b, HIP 78459 b, GJ 9537 b, GJ 606.2 b, TYC 2576-2228-1 b rho CrB c, ρ CrB c, HD 143761 c, Gaia DR2 1323427759184545536 c, HIP 78459 c, GJ 9537 c, GJ 606.2 c, TYC 2576-2228-1 c
      Description The planet candidate orbiting Rho Coronae Borealis was one of the first exoplanet discoveries, with a radial velocity minimum mass of 1.093 Jupiter masses. Subsequent analysis of the Hipparcos astrometric data indicates that the companion is actually a low-mass star in a nearly face-on orbit, however this would make the system unstable. HD 143761 c is a warm Neptune-class planet orbiting external to the previously-known giant planet. For the system to be stable, the inclination cannot be below 4°.
      Lists Confirmed planets
      Mass [Mjup] 1.04±0.02 0.079±0.006
      Mass [Mearth] 332±8 25±2
      Radius [Rjup] N/A N/A
      Radius [Rearth] N/A N/A
      Orbital period [days] 39.8458+0.0015−0.0014 102.54±0.17
      Semi-major axis [AU] 0.220+0.002−0.003 0.412±0.005
      Eccentricity 0.037±0.004 0.05+0.06−0.04
      Equilibrium temperature [K] N/A N/A
      Discovery method RV
      Discovery year 1997 2016
      Last updated [yy/mm/dd] 17/11/27

      starStars in the system

      This table lists all stars in the system Rho Coronae Borealis.

        Rho Coronae Borealis
      Alternative star names rho CrB, ρ CrB, HD 143761, HIP 78459, HR 5968, Gliese 606.2, GJ 9537, BD+33 2663, TYC 2576-2228-1, SAO 65024, LHS 3145, Gaia DR2 1323427759184545536, GJ 606.2
      Mass [MSun] 0.89±0.03
      Radius [RSun] 1.36±0.03
      Age [Gyr] N/A
      Metallicity [Fe/H] -0.31±0.05
      Temperature [K] 5627±54
      Spectral type G0V
      Visual magnitude 5.41±0.05

      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).

      PlutoMercuryMarsVenusEarthNeptuneUranusSaturnJupiterRho Coronae Borealis bRho Coronae Borealis c

      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.

      Rho Coronae Borealis bRho Coronae Borealis c

      referencesScientific references and contributors

      Links to scientific papers and other data sources


      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) 3
      Hanno Rein hanno(at) 2

      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 useful.


      If you spot an error or if you can contribute additional data to this entry, please send an e-mail to 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.