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In the dark energy star picture a compact object is transparent at radio andoptical frequencies, and acts as a defocusing lens. Thus the object itselfappears as a luminous disk whose surface brightness reflects the surfacebrightness of the background. In the case of rotating dark energy stars theimage will also contain background independent emission features. In this notewe provide simple analytic formulae for the separation of these features as afunction of angular momentum and viewing angle. In the case of rapid rotationthese features will appear to lie within the shadow expected if the compactobject were a black hole.

On the appearance of compact objects at radio and optical frequencies