SIMBAD query result

'Antennae Galaxies': this identifier has an incorrect format for catalog: A (ACO): Abell, Corwin, Olowin

Please have a look at the "Dictionary of Nomenclature"

Result of query: info cati Antennae Galaxies

 [Class]      Acronym  (Explanation)   . . . . . . . . . in Simbad, use:
 [X(NAME the Antennae)] Antennae (the Antennae)  . . . . [ZFR2002] NN
                                                      or [ZFR2002] Na
                                                      or [ZFR2002] {X}-NN        (L)
(L) following the Usage indicates a 'format' found later in the literature,
    which is not recognized by SIMBAD.

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