I don't really have a most popular celestial object myself but if I did have one this would be the thing.

Once you have targeted an object the real fun begins.

The SkyScout includes entertaining and educational audio and text information, including facts, trivia, history and mythology about our most popular celestial objects.

Real fun indeed. It's a gadget that identifies stars and then tells you the aforementioned things about them, based on GPS and some other stuff and...oh, go read it for yourself.