SIMBAD query result

Identifier not found in the database : IERS B2309+258

Recognized name catalogue in VizieR : IERS B2309+258

Please have a look at the "Dictionary of Nomenclature"

Result of query: info cati IERS B2309+258

 [Class]      Acronym  (Explanation)   . . . . . . . . . in Simbad, use:
 [Radio]      ICRS (International Celestial Reference System) =E= IERS BHHMM+DDd
 [Radio]      IERS (International Earth Rotation Service) =E= IERS BHHMM+DDd
=E= indicates catalogues available in electronic form at CDS

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