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NGC 523 - Arp 158
Andromeda
Penryn, California
November 2007 / October 2010
M 250 @ f9.3 (ST-4, ag)
ST10-XME R(s)GB 15 minute subs
ST-10XME Lum   10 minute subs (2010)


NGC 520 is a "Early stage galaxy" disturbed by a possible merger of small companion galaxies.  NGC 523 is a 3x1 arc minute, magnitude 14.4.  Simbad list type as 3 D.