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Variable star
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==Nomenclature== {{Main|Variable star designation}} In a given constellation, the first variable stars discovered were designated with letters R through Z, e.g. [[R Andromedae]]. This system of [[Astronomical naming conventions|nomenclature]] was developed by [[Friedrich Wilhelm Argelander|Friedrich W. Argelander]], who gave the first previously unnamed variable in a constellation the letter R, the first letter not used by [[Bayer designation|Bayer]]. Letters RR through RZ, SS through SZ, up to ZZ are used for the next discoveries, e.g. [[RR Lyrae]]. Later discoveries used letters AA through AZ, BB through BZ, and up to QQ through QZ (with J omitted). Once those 334 combinations are exhausted, variables are numbered in order of discovery, starting with the prefixed V335 onwards.
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