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We performed a mid-infrared imaging survey of evolved stars in order to studythe dust distribution in circumstellar envelopes around these objects and tobetter understand the mass-loss mechanism responsible for the formation ofthese envelopes. During this survey, we resolved for the first time thecircumstellar environment of IRAS 17163-3907 (hereinafter IRAS17163), which isone of the brightest objects in the mid-infrared sky, but is surprisingly notwell studied. Our aim is to determine the evolutionary status of IRAS 17163 andstudy its circumstellar environment in order to understand its mass-losshistory. We obtained diffraction-limited images of IRAS 17163 in themid-infrared using VISIR on the VLT. Optical spectra of the object allowed usto determine its spectral type and estimate its distance via the presence ofdiffuse interstellar bands. We show that IRAS 17163 is a Post-Red Supergiant,possibly belonging to the rare class of Yellow Hypergiants, and is very similarto the well studied object IRC +10420. Our mid-infrared images of IRAS 17163are the first direct images of this bright mid-infrared source. These imagesclearly show the presence of a double dusty detached shell around the centralstar, due to successive ejections of material with a timescale of the order of400 years and a total circumstellar mass larger than 4 M$_{\odot}$. Thisindicates that non quiescent mass-loss occurs during this phase of stellarevolution.

A double detached shell around a post-Red Supergiant:IRAS 17163-3907, the Fried Egg nebula