Word origin · etymology
Eponym plus descriptive noun.
Named for Johann Bayer, whose Uranometria used Greek letters with constellation names. Designation means the assigned identifier.
How we know · epistemology
Astronomical naming convention
Letters and constellation names identify catalogue objects, rather than a measured hierarchy of influence. The identifier should resolve to the intended star; a traditional constellation label does not make that star part of the matching zodiac sign.
Connected concepts
Terms used in this explanation
Sources & provenance
Use the citations beside each section to distinguish a calculation convention, a historical teaching and an editorial example.