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We present a new planetary nebula, first identified in images from theAustralia Telescope Compact Array, although not recognized at that time. Recentobservations with the Spitzer Space Telescope during the GLIMPSE Legacy programhave rediscovered the object. The high-resolution radio and infrared imagesenable the identification of the central star or its wind, the recognition ofthe radio emission as thermal, and the probable presence of polycylic aromatichydrocarbons in and around the source. These lead to the conclusion thatG313.3+00.3 is a planetary nebula. This object is of particular interestbecause it was discovered solely through radio and mid-infrared imaging,without any optical (or near-infrared) confirmation, and acts as a proof ofconcept for the discovery of many more highly extinguished planetary nebulae.G313.3+00.3 is well-resolved by both the instruments with which it wasidentified, and suffers extreme reddening due to its location in theScutum-Crux spiral arm.Comment: 18 pages, LaTeX (aastex), incl. 8 PostScript (eps) figures and 1  table. Accepted by ApJ (Part 1

G313.3+00.3: A New Planetary Nebula Discovered by the Australia Telescope Compact Array and theSpitzer Space Telescope