baltieri on 05-May-2017 10:14:40 GMT about ACO 1689
The coodinates of Abell 1689 in Simbad are about 2 arcmin off from the X-ray peak and the main BCG galaxy of the clusters. The reference article does not seem suitable/relevant for the coordinates. In general the X-ray positions should be used when possible for bright galaxy clusters.
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View annotation on ACO 1689 object