Dheneb: The Tail

Dheneb is one of the many star names built on the Arabic dhanab, a tail, which marks the tail of whatever figure the star belongs to. The same root gives Deneb in Cygnus, Denebola in Leo, Deneb Algedi in Capricornus and Deneb Kaitos in Cetus, and the spelling of each has drifted independently through Latin transliteration, which is why so many similar forms crowd the catalogues. Here it marks the tail of Aquila, the eagle. Because several stars in the tail of the same bird were described in the same way, the Aquila tail-names in particular multiplied, and different compilers assigned them to different stars. No single traditional planetary nature is recorded for this entry.

Denebola in Leo and Deneb Algedi in Capricornus both appear elsewhere in this same set of tables as stars in their own right, and setting all the dhanab-derived names side by side is a genuinely useful way to see the method of the old Arabic sky at work: rather than inventing a fresh proper name for every star, the tradition frequently just stated the star's place on the animal or figure it belonged to, so the same word for tail recurs wherever a constellation happened to have one. No planetary nature is recorded for this entry specifically, which is the ordinary condition for names built purely on anatomical position rather than on a star bright enough to have drawn Ptolemy's individual attention.