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Flamsteed Designation

(star designation system dating from 1700s)

The Flamsteed Designation for stars was developed by astronomer John Flamsteed for his early-1700s Astronomical Catalog Catalogus Britannicus, which covered stars visible from England. It groups stars by constellation indicating its individual stars by a Latin form of the constellation (optionally abbreviated) with a preceding number. Examples: 51 Pegasi, 61 Cygni.

Some stars are still sometimes referred to by this designation, and Extra-Solar Planets associated with them are often indicated by using the designation with a subsequent letter, starting with "b" for the first planet discovered. e.g., 55 Cancri e orbiting the star 55 Cancri in the constellation Cancer.