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PKS 1413+135 is one of the most peculiar blazars known. Its strangeproperties led to the hypothesis almost four decades ago that it isgravitationally lensed by a mass concentration associated with an interveninggalaxy. It exhibits symmetric achromatic variability, a rare form ofvariability that has been attributed to gravitational milli-lensing. It hasbeen classified as a BL Lac object, and is one of the rare objects in thisclass with a visible counterjet. BL Lac objects have jet axes aligned close tothe line of sight. It has also been classified as a compact symmetric object,which have jet axes not aligned close to the line of sight. Intensive effortsto understand this blazar have hitherto failed to resolve even the questions ofthe orientation of the relativistic jet, and the host galaxy. Answering thesetwo questions is important as they challenge our understanding of jets inactive galactic nuclei and the classification schemes we use to describe them.We show that the jet axis is aligned close to the line of sight and PKS1413+135 is almost certainly not located in the apparent host galaxy, but is abackground object in the redshift range $0.247 < z < 0.5$. The interveningspiral galaxy at $z = 0.247$ provides a natural host for the putative lensresponsible for symmetric achromatic variability and is shown to be a Seyfert 2galaxy. We also show that, as for the radio emission, a "multizone" model isneeded to account for the high-energy emission.

The Relativistic Jet Orientation and Host Galaxy of the Peculiar Blazar PKS 1413+135