English: This image captured by the SOFI instrument on ESO’s New Technology Telescope at the La Silla Observatory shows the free-floating planet CFBDSIR J214947.2-040308.9 in infrared light. This object, which appears as a faint blue dot at the centre of the picture and is marked with a cross, is the closest such object to the Solar System. It does not orbit a star and hence does not shine by reflected light; the faint glow it emits can only be detected in infrared light. The object appears blueish in this near-infrared view because much of the light at longer infrared wavelengths is absorbed by methane and other molecules in the planet's atmosphere. In visible light the object is so cool that it would only shine dimly with a deep red colour when seen close-up.
Français : Cette image, réalisée par l’instrument SOFI sur le télescope télescope NTT de l’ESO à l’Observatoire de La Silla, montre la planète errante CFBDSIR J214947.2-040308.9 dans l’infrarouge. Cet objet, qui apparaît comme un faible point bleu au centre de l’image et qui est marqué par une croix, est l’objet de ce type le plus proche du Système Solaire.
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{{Information |Description ={{en|1=The free-floating planet CFBDSIR J214947.2-040308.9 (annotated) }} {{fr|1=La [[n:fr:Astronomie : découverte d’une planète errante dans la banlieue du système solaire|planète errante CF...
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La planète errante CFBDSIR J214947.2-040308.9
Cette image, réalisée par l’instrument SOFI sur le télescope NTT de l’ESO à l’Observatoire de La Silla, montre la planète errante CFBDSIR J214947.2-040308.9 dans l’infrarouge. Cet objet, qui apparaît comme un faible point bleu au centre de l’image et qui est marqué par une croix, est l’objet de ce type le plus proche du Système Solaire. (ESO/P. Delorme)