Pikador on 24-Oct-2017 11:12:38 GMT about NGC 4397
NGC 4397 is an asterism of three stars (or triple star) in slightly different position.
See:
http://cseligman.com/text/atlas/ngc43a.htm#4397
http://haroldcorwin.net/ngcic/ngcnotes.all
http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+4397
http://leda.univ-lyon1.fr/ledacat.cgi?o=ngc%204397
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View annotation on NGC 4397 object