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Type: galaxy (in group), S0
Mag: B=13.6, V=?
Size: 1.621′ x 1.513′
NGC 5580 may be = NGC 5590. See NGC 5579.
Together with NGC 5579 listed as No. 69 in Arp's "Atlas of Peculiar Galaxies" (Astrophysical Journal Supplement, vol. 14, 1966.) He remarks "three-armed spiral."
The RNGC (Sulentic and Tifft 1973) notes that this is a 14.5 mag galaxy. Their coded description reads VSM,DIF,LBM,NR S 99.
The Messier objects
The Bennett objects
The Caldwell list
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