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an open source database of all discovered extrasolar planets

47 UMa

The planetary system 47 UMa hosts at least 3 planets.

  System parameters
Primary system name 47 UMa
Alternative system names 47 Uma
Right ascension 10 59 27.97282
Declination +40 25 48.9202
Distance [parsec] 14.06±0.05
Distance [lightyears] 45.87±0.16
Number of stars in system 1
Number of planets in system 3

ArchitectureArchitecture of the system

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

  •  47 UMa, stellar object
    •  47 UMa b, planet, semi-major axis: 2.10±0.02 AU
      •  47 UMa c, planet, semi-major axis: 3.60±0.10 AU
        •  47 UMa d, planet, semi-major axis: 12+2−3 AU

        PlanetsPlanets in the system

        This table lists all planets in the system 47 UMa.

          47 UMa b 47 UMa c 47 UMa d
        Alternative planet names 47 Ursae Majoris b, HD 95128 b, HR 4277 b, TYC 3009-2703-1 b, GJ 407 b, Chalawan b, Gaia DR2 777254360337133312 b, HIP 53721 b 47 Ursae Majoris c, HD 95128 c, HR 4277 c, TYC 3009-2703-1 c, GJ 407 c, Chalawan c, Gaia DR2 777254360337133312 c, HIP 53721 c 47 Ursae Majoris d, HD 95128 d, HR 4277 d, TYC 3009-2703-1 d, GJ 407 d, Chalawan d, Gaia DR2 777254360337133312 d, HIP 53721 d
        Description 47 Ursae Majoris is a solar analog. It hosts at least three planets. The habitable zone could host a terrestrial planet in a stable orbit. Two METI messages called 'Teen Age Message' and 'Cosmic Call 2' have been sent to 47 Ursae Majoris. They will reach the planets in 2047 and 2059.
        Lists Confirmed planets
        Mass [Mjup] 2.53+0.07−0.06 0.54±0.07 1.6+0.3−0.5
        Mass [Mearth] 804+22−19 172+21−23 521+92−153
        Radius [Rjup] N/A N/A N/A
        Radius [Rearth] N/A N/A N/A
        Orbital period [days] 1078±2 2391+100−87 14002+4018−5095
        Semi-major axis [AU] 2.10±0.02 3.60±0.10 12+2−3
        Eccentricity 0.032±0.014 0.10+0.05−0.10 0.16+0.09−0.16
        Equilibrium temperature [K] N/A N/A N/A
        Discovery method RV
        Discovery year 1996 2001 2010
        Last updated [yy/mm/dd] 15/09/24

        starStars in the system

        This table lists all stars in the system 47 UMa.

          47 UMa
        Alternative star names 47 Ursae Majoris, HD 95128, HIP 53721, TYC 3009-2703-1, SAO 43557, HR 4277, Gliese 407, GJ 407, BD+41 2147, 2MASS J10592802+4025485, Chalawan, Gaia DR2 777254360337133312
        Mass [MSun] 1.06+0.03−0.02
        Radius [RSun] 1.24±0.04
        Age [Gyr] 6.5+1.4−1.0
        Metallicity [Fe/H] -0.0190
        Temperature [K] 5819
        Spectral type G0V
        Visual magnitude 5.04

        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).

        PlutoMercuryMarsVenusEarthNeptuneUranusSaturnJupiter47 UMa b47 UMa c47 UMa d

        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 zone47 UMa b47 UMa c47 UMa d

        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) 2
        Hanno Rein hanno(at) 3

        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.