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an open source database of all discovered extrasolar planets

VHS 1256-1257

The planetary system VHS 1256-1257 hosts at least one planet.

  System parameters
Primary system name VHS 1256-1257
Alternative system names VHS J125602.15-125721.7
Right ascension 12 56 01.922
Declination -12 57 23.990
Distance [parsec] 12.7±1.0edit
Distance [lightyears] 41±3
Number of stars in system 1
Number of planets in system 1

ArchitectureArchitecture of the system

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

  •  VHS 1256-1257, stellar object
    •  VHS 1256-1257 b, planet

    PlanetsPlanets in the system

    This table lists all planets in the system VHS 1256-1257.

      VHS 1256-1257 b
    Alternative planet names VHS J125602.15-125721.7 b, 2MASS J125601.83-125727.6
    Description VHS 1256-1257 b is a common-proper motion L-dwarf companion of a nearby red dwarf star. It is cooler than expected for a field L-dwarf, and its mass is close to the deuterium-burning limit.edit
    Lists Confirmed planets
    Mass [Mjup] 11.2+9.7−1.8edit
    Mass [Mearth] 3560+3084−572
    Radius [Rjup] N/A
    Radius [Rearth] N/A
    Orbital period [days] N/A
    Semi-major axis [AU] N/A
    Eccentricity N/A
    Equilibrium temperature [K] 880+140−110edit
    Discovery method imaging
    Discovery year 2015
    Last updated [yy/mm/dd] 15/07/23

    starStars in the system

    This table lists all stars in the system VHS 1256-1257.

      VHS 1256-1257
    Alternative star names VHS J125602.15-125721.7, 2MASS J125602.15-125721.7
    Mass [MSun] 0.070+0.019−0.014edit
    Radius [RSun] N/A
    Age [Gyr] > 0.1500edit
    Metallicity [Fe/H] N/A
    Temperature [K] 2620±140edit
    Spectral type M7.5
    Visual magnitude 17.76±0.06edit

    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).

    PlutoMercuryMarsVenusEarthNeptuneUranusSaturnJupiterVHS 1256-1257 b

    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 zoneVHS 1256-1257 b

    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) 1
    Ryan Varley ryanjvarley(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 usefule.


    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.