SIMBAD query result

Gaia DR2: For now, Gaia DR2 data are not in SIMBAD, it is available in Vizier. The CDS will perform a cross-identification of Gaia DR2 with the astronomical objects in the SIMBAD bibliographic database. This will be done with very strict criteria in order to avoid erroneous cross-identifications. Especially, only the 6.5 milllions objects with subarseconds coordinates will be searched in Gaia DR2. Expected to be ready on June 30, 2018.

'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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