Arp 2 GC is one of several globulars that may have been captured by the Milky Way from the Sagittarius Dwarf Spheroidal Galaxy, along with Terzan 7, Terzan 8 and several others. It's pretty dim, so I'd be surprised if it was visible in less than a 12-inch, at least from north of +35° latitude. That said, has anyone seen it in an 8" or 10" from at least mid-northern latitudes?
Here's an observation from last July at Lassen National Park at over 8100 ft elevation (with Jimi)
24" (7/25/14): very faint, moderately large, low surface brightness glow, roughly 2' diameter. Contains a small, slightly brighter core or knot near the center. Slightly grainy or mottled appearance, but no clear resolution except around the edges (possibly field stars). Located 5' SW of a distinctive asterism consisting of a 1.5' east-west chain of four stars, with a fifth star 0.4' south of the center of the chain.
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