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We present the discovery of a source with broadband infrared photometriccharacteristics similar to Sakurai's Object. WISE J180956.27-330500.2(hereafter, J1810-3305) shows very red WISE colors, but a very blue 2MASS [K]vs. WISE [W1 (3.4 micron)] color. It was not visible during the IRAS era, butnow has a 12 micron flux well above the IRAS point source catalog detectionlimit. There are also indications of variability in historical opticalphotographic plates, as well as in multi-epoch AKARI mid-infrared measurements.The broadband infrared spectral energy distribution, post-IRAS brightening andmultiwavelength variability are all characteristics also shared by Sakurai'sObject - a post asymptotic giant branch (post-AGB) star which underwent a latethermal pulse and recently ejected massive envelopes of dust that are currentlyexpanding and cooling. Optical progenitor colors suggest that J1810-3305 mayhave been of late spectral class. Its dramatic infrared brightening, and thedetection of a late-type optical counterpart are consistent with a scenario inwhich we have caught an extremely massive dust ejection event (in 1998 orshortly before) during the thermal pulse of an AGB star, thus providing aunique opportunity to observe stellar evolution in this phase. J1810-3305 isthe only source in the entire WISE preliminary data release with similarinfrared SED and variability, emphasizing the rarity of such sources.Confirmation of its nature is of great importance.

Dramatic infrared variability of WISE J1810-3305: catching early dust ejection during the thermal pulse of an AGB star?