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A capital letter suffix naming a component.
Also known as: Multiple star suffix, A and B component notation
The notation adding a capital letter to a star's designation to name one component of a multiple system.
Assigns letters by brightness at the time of discovery, so a component may be relettered when a system turns out to have more members than were first seen.
Contexts: History
A capital Roman letter appended to an existing star designation, sometimes with a lower-case letter for a further subdivision.