Sagittarii

Sagittarii is the Latin genitive form of the constellation name Sagittarius and is used in astronomical star naming to indicate that a star belongs to the Sagittarius constellation. In practice, Sagittarii appears in Bayer designations such as Alpha Sagittarii, Beta Sagittarii, Gamma Sagittarii, and so on, where the Greek letter identifies the star within the constellation and Sagittarii marks its belonging to Sagittarius.

The use of Sagittarii as the genitive marker reflects traditional Latin naming conventions carried into modern star catalogs and charts. It does not denote a separate astronomical object; rather, it functions as part of the formal name of a star. The system helps readers recognize the star’s location in the sky by associating it with the relevant constellation.

Examples of usage include notable stars labeled with the Sagittarii designation and, in some cases, additional traditional names or coordinates. While many stars in Sagittarius are primarily known by their Bayer designation (for example, Alpha Sagittarii or Beta Sagittarii), some have widely used proper names as well. The Sagittarii designation remains part of historical and contemporary astronomical nomenclature, illustrating how Latin naming conventions continue to structure modern star catalogs.