Pikador on 19-Jan-2017 21:00:49 GMT about Z 142-26
This galaxy shouldn't be called NGC 6581. NGC 6581 is IC 1280 (PGC 61549).
Sources: NED, HyperLeda (http://leda.univ-lyon1.fr/ledacat.cgi?o=ngc%206581), and explanation by H. Corwin: http://haroldcorwin.net/ngcic/ngcnotes.all
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View annotation on Z 142-26 object