900/1200mm - 48" (5/10/18): at 488x; faint, large, slightly elongated SW-NE, roughly 1.5' diameter, very low surface brightness, no structure. Picked up 14' NNE of PGC 46931, the brightest cD galaxy in AGC 1738 at z = .115 (light-travel time = 1.5 billion years).