Pikador on 05-Mar-2015 09:11:48 GMT about
According to modern sources NGC 5580 is most probably duplicate of NGC 5590.
1. NED
2. Courtney Seligman: http://cseligman.com/text/atlas/ngc55a.htm#5590
3. HyperLeda: http://leda.univ-lyon1.fr/ledacat.cgi?o=ngc%205580
4. The NGC/IC Project
5. Both references on NGC 5580 SIMBAD page already recognize NGC 5580 as a duplicate of 5590.
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