Pikadore on 11-Aug-2015 08:29:48 GMT about NGC 4558
This galaxy has wrong PGC (Hyperleda) number in your database and it's also incorrectly catalogued 2nd time as NGC 4557. Correct numbers of NGC 4558 are PGC 41995 and PGC 42019. NGC 4557 is a triple star. PGC 42005 number should be added to IC 3556.
Sources:
http://cseligman.com/text/atlas/ngc45a.htm#4557
NED
Hyperleda
Harold Corwin, Jr notes: http://haroldcorwin.net/ngcic/ngcnotes.all
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View annotation on NGC 4558 object